字符串类库代码,Java代码库,德仔网

代码语言
代码分类
【Java】字符串类库
作者: / 发布于2011/1/14/ 484
<div><span style="color: #0000ff">package</span><span style="color: #000000"> net.java2000.tools;

</span><span style="color: #008000">/**</span><span style="color: #008000">
* Title: Java Bean 工具
* Description:
* Copyright: Copyright (c) 2001
* Company: JAVA世纪网 </span><span style="color: #008000; text-decoration: underline">http://www.java2000.net</span><span style="color: #008000">
* </span><span style="color: #808080">@author</span><span style="color: #008000"> 赵学庆
* </span><span style="color: #808080">@version</span><span style="color: #008000"> 1.0
</span><span style="color: #008000">*/</span><span style="color: #000000">
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.</span><span style="color: #000000">*</span><span style="color: #000000">;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.regex.Pattern;

</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> StrTools {
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 分割字符串
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str String 原始字符串
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> splitsign String 分隔符
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String[] 分割后的字符串数组
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 @SuppressWarnings(</span><span style="color: #000000">"</span><span style="color: #000000">unchecked</span><span style="color: #000000">"</span><span style="color: #000000">)
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String[] split(String str, String splitsign) {
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> index;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (str </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> splitsign </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 ArrayList al </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> ArrayList();
 </span><span style="color: #0000ff">while</span><span style="color: #000000"> ((index </span><span style="color: #000000">=</span><span style="color: #000000"> str.indexOf(splitsign)) </span><span style="color: #000000">!=</span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #000000">1</span><span style="color: #000000">) {
 al.add(str.substring(</span><span style="color: #000000">0</span><span style="color: #000000">, index));
 str </span><span style="color: #000000">=</span><span style="color: #000000"> str.substring(index </span><span style="color: #000000">+</span><span style="color: #000000"> splitsign.length());
 }
 al.add(str);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> (String[]) al.toArray(</span><span style="color: #0000ff">new</span><span style="color: #000000"> String[</span><span style="color: #000000">0</span><span style="color: #000000">]);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 替换字符串
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> from String 原始字符串
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> to String 目标字符串
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> source String 母字符串
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String 替换后的字符串
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String replace(String from, String to, String source) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (source </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> from </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> to </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">)
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 StringBuffer bf </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuffer(</span><span style="color: #000000">""</span><span style="color: #000000">);
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> index </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #000000">1</span><span style="color: #000000">;
 </span><span style="color: #0000ff">while</span><span style="color: #000000"> ((index </span><span style="color: #000000">=</span><span style="color: #000000"> source.indexOf(from)) </span><span style="color: #000000">!=</span><span style="color: #000000"> </span><span style="color: #000000">-</span><span style="color: #000000">1</span><span style="color: #000000">) {
 bf.append(source.substring(</span><span style="color: #000000">0</span><span style="color: #000000">, index) </span><span style="color: #000000">+</span><span style="color: #000000"> to);
 source </span><span style="color: #000000">=</span><span style="color: #000000"> source.substring(index </span><span style="color: #000000">+</span><span style="color: #000000"> from.length());
 index </span><span style="color: #000000">=</span><span style="color: #000000"> source.indexOf(from);
 }
 bf.append(source);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> bf.toString();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 替换字符串，能能够在HTML页面上直接显示(替换双引号和小于号)
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str String 原始字符串
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String 替换后的字符串
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String htmlencode(String str) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (str </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 }

 </span><span style="color: #0000ff">return</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000">\"</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">&quot;</span><span style="color: #000000">"</span><span style="color: #000000">, replace(</span><span style="color: #000000">"</span><span style="color: #000000"><</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">&lt;</span><span style="color: #000000">"</span><span style="color: #000000">, str));
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 替换字符串，将被编码的转换成原始码（替换成双引号和小于号）
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str String
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String htmldecode(String str) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (str </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 }

 </span><span style="color: #0000ff">return</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000">&quot;</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">\"</span><span style="color: #000000">"</span><span style="color: #000000">, replace(</span><span style="color: #000000">"</span><span style="color: #000000">&lt;</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000"><</span><span style="color: #000000">"</span><span style="color: #000000">, str));
 }

 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">final</span><span style="color: #000000"> String _BR </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000"><br/></span><span style="color: #000000">"</span><span style="color: #000000">;

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 在页面上直接显示文本内容，替换小于号，空格，回车，TAB
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str String 原始字符串
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String 替换后的字符串
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String htmlshow(String str) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (str </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 }

 str </span><span style="color: #000000">=</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000"><</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">&lt;</span><span style="color: #000000">"</span><span style="color: #000000">, str);
 str </span><span style="color: #000000">=</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">&nbsp;</span><span style="color: #000000">"</span><span style="color: #000000">, str);
 str </span><span style="color: #000000">=</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000">\r\n</span><span style="color: #000000">"</span><span style="color: #000000">, _BR, str);
 str </span><span style="color: #000000">=</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000">\n</span><span style="color: #000000">"</span><span style="color: #000000">, _BR, str);
 str </span><span style="color: #000000">=</span><span style="color: #000000"> replace(</span><span style="color: #000000">"</span><span style="color: #000000">\t</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #000000">"</span><span style="color: #000000">, str);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> str;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 返回指定字节长度的字符串
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str String 字符串
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> length int 指定长度
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> String 返回的字符串
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String toLength(String str, </span><span style="color: #0000ff">int</span><span style="color: #000000"> length) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (str </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (length </span><span style="color: #000000"><=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #000000">""</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (str.getBytes(</span><span style="color: #000000">"</span><span style="color: #000000">GBK</span><span style="color: #000000">"</span><span style="color: #000000">).length </span><span style="color: #000000"><=</span><span style="color: #000000"> length) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> str;
 }
 } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception ex) {
 }
 StringBuffer buff </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuffer();

 </span><span style="color: #0000ff">int</span><span style="color: #000000"> index </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">;
 </span><span style="color: #0000ff">char</span><span style="color: #000000"> c;
 length </span><span style="color: #000000">-=</span><span style="color: #000000"> </span><span style="color: #000000">3</span><span style="color: #000000">;
 </span><span style="color: #0000ff">while</span><span style="color: #000000"> (length </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 c </span><span style="color: #000000">=</span><span style="color: #000000"> str.charAt(index);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (c </span><span style="color: #000000"><</span><span style="color: #000000"> </span><span style="color: #000000">128</span><span style="color: #000000">) {
 length</span><span style="color: #000000">--</span><span style="color: #000000">;
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
 length</span><span style="color: #000000">--</span><span style="color: #000000">;
 length</span><span style="color: #000000">--</span><span style="color: #000000">;
 }
 buff.append(c);
 index</span><span style="color: #000000">++</span><span style="color: #000000">;
 }
 buff.append(</span><span style="color: #000000">"</span><span style="color: #000000">...</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> buff.toString();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断是否为整数
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str 传入的字符串
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 是整数返回true,否则返回false
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isInteger(String str) {
 Pattern pattern </span><span style="color: #000000">=</span><span style="color: #000000"> Pattern.compile(</span><span style="color: #000000">"</span><span style="color: #000000">^[-\\+]?[\\d]*$</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> pattern.matcher(str).matches();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断是否为浮点数，包括double和float
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str 传入的字符串
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 是浮点数返回true,否则返回false
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isDouble(String str) {
 Pattern pattern </span><span style="color: #000000">=</span><span style="color: #000000"> Pattern.compile(</span><span style="color: #000000">"</span><span style="color: #000000">^[-\\+]?[.\\d]*$</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> pattern.matcher(str).matches();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断输入的字符串是否符合Email样式.
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str 传入的字符串
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 是Email样式返回true,否则返回false
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isEmail(String str) {
 Pattern pattern </span><span style="color: #000000">=</span><span style="color: #000000"> Pattern.compile(</span><span style="color: #000000">"</span><span style="color: #000000">^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> pattern.matcher(str).matches();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断输入的字符串是否为纯汉字
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str 传入的字符窜
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 如果是纯汉字返回true,否则返回false
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isChinese(String str) {
 Pattern pattern </span><span style="color: #000000">=</span><span style="color: #000000"> Pattern.compile(</span><span style="color: #000000">"</span><span style="color: #000000">[\u0391-\uFFE5]+$</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> pattern.matcher(str).matches();
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 是否为空白,包括null和""
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str
 * </span><span style="color: #808080">@return</span><span style="color: #008000">
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isBlank(String str) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> str </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #0000ff">null</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> str.trim().length() </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">;
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断是否为质数
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> x
 * </span><span style="color: #808080">@return</span><span style="color: #008000">
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> isPrime(</span><span style="color: #0000ff">int</span><span style="color: #000000"> x) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000"><=</span><span style="color: #000000"> </span><span style="color: #000000">7</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">2</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> x </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">3</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> x </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">5</span><span style="color: #000000"> </span><span style="color: #000000">||</span><span style="color: #000000"> x </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">7</span><span style="color: #000000">)
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> c </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">7</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> </span><span style="color: #000000">2</span><span style="color: #000000"> </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">)
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> </span><span style="color: #000000">3</span><span style="color: #000000"> </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">)
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> </span><span style="color: #000000">5</span><span style="color: #000000"> </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">)
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> end </span><span style="color: #000000">=</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000">) Math.sqrt(x);
 </span><span style="color: #0000ff">while</span><span style="color: #000000"> (c </span><span style="color: #000000"><=</span><span style="color: #000000"> end) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">4</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">2</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">4</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">2</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">4</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">6</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">2</span><span style="color: #000000">;
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (x </span><span style="color: #000000">%</span><span style="color: #000000"> c </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">false</span><span style="color: #000000">;
 }
 c </span><span style="color: #000000">+=</span><span style="color: #000000"> </span><span style="color: #000000">6</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;
 }

 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> main(String[] args) {
 String[] numbers </span><span style="color: #000000">=</span><span style="color: #000000"> { </span><span style="color: #000000">"</span><span style="color: #000000">12345</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">-12345</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">123.45</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">-123.45</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">.12345</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">-.12345</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">a12345</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">12345a</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">123.a45</span><span style="color: #000000">"</span><span style="color: #000000"> };
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (String str : numbers) {
 System.out.println(str </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">=</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> isInteger(str) </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> isDouble(str));
 }

 String[] emails </span><span style="color: #000000">=</span><span style="color: #000000"> { </span><span style="color: #000000">"</span><span style="color: #000000">1@2.com</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">1.2@3.com</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">1@3.4.5.com</span><span style="color: #000000">"</span><span style="color: #000000"> };
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (String str : emails) {
 System.out.println(str </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">=</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> isEmail(str));
 }
 String[] chineses </span><span style="color: #000000">=</span><span style="color: #000000"> { </span><span style="color: #000000">"</span><span style="color: #000000">中国</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">1中国</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">中国1</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">1中国2</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">中1国</span><span style="color: #000000">"</span><span style="color: #000000"> };
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (String str : chineses) {
 System.out.println(str </span><span style="color: #000000">+</span><span style="color: #000000"> </span><span style="color: #000000">"</span><span style="color: #000000">=</span><span style="color: #000000">"</span><span style="color: #000000"> </span><span style="color: #000000">+</span><span style="color: #000000"> isChinese(str));
 }
 }
}</span>
</div>
试试其它关键字
　字符串类库　
同语言下
可能有用的
贡献的其它代码Label