判断是不是合法字符代码,Java代码库,德仔网

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【Java】判断是不是合法字符
作者: / 发布于2011/1/14/ 542
<div><span style="color: #008000">/**</span><span style="color: #008000">
 * 判断是不是合法字符
 * c 要判断的字符
 </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"> isLetter(String c) {
 </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> result </span><span style="color: #000000">=</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"> (c</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"> c.length()</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: #008000">//</span><span style="color: #008000">a-z </span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (c.compareToIgnoreCase(</span><span style="color: #000000">"</span><span style="color: #000000">a</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: #000000">&&</span><span style="color: #000000"> c.compareToIgnoreCase(</span><span style="color: #000000">"</span><span style="color: #000000">z</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">true</span><span style="color: #000000">;
 }
 </span><span style="color: #008000">//</span><span style="color: #008000">0-9</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (c.compareToIgnoreCase(</span><span style="color: #000000">"</span><span style="color: #000000">0</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: #000000">&&</span><span style="color: #000000"> c.compareToIgnoreCase(</span><span style="color: #000000">"</span><span style="color: #000000">9</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">true</span><span style="color: #000000">;
 }
 </span><span style="color: #008000">//</span><span style="color: #008000">. - _</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (c.equals(</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"> c.equals(</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"> c.equals(</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"> </span><span style="color: #0000ff">true</span><span style="color: #000000">;
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> result; 
}

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