数组和数组之间的转换代码,Java代码库,德仔网

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【Java】数组和数组之间的转换
作者: / 发布于2011/1/14/ 477
<div><span style="color: #0000ff">import</span><span style="color: #000000"> java.lang.reflect.Array;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Date;

</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> TestCast {

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> args
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #008000">//</span><span style="color: #008000">public static void main(String[] args) {</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #008000">/**</span><span style="color: #008000"> </span><span style="color: #008000">*//**</span><span style="color: #008000">
 * 
 * 一般情况下数组和数组是不能直接进行转换的,例如:
 * Object[] t1={"1","2"};
 * String[] t2=(String[])t1;//这里会出现转换错误
 * 
 * 下面提供了一种方式进行转换
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 
 </span><span style="color: #008000">//</span><span style="color: #008000">1.0测试一般基础类</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #008000">/*</span><span style="color: #008000"> Object[] t1={"1","2","3","4","5"};
 String[] m1=(String[])TestCast.cast(t1,String.class);
 for(int i=0;i<m1.length;i++)
 System.out.println(m1[i]);
 
 //2.0测试复杂对象
 Object[] t2={new Date(1000),new Date(2000)};
 Date[] m2=(Date[])TestCast.cast(t2,Date.class);
 for(int i=0;i<m2.length;i++)
 System.out.println(m2[i].toString());</span><span style="color: #008000">*/</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: #008000">/**</span><span style="color: #008000"> </span><span style="color: #008000">*//**</span><span style="color: #008000">
 * 将数组array转换成clss代表的类型后返回
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> array 需要转换的数组
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> clss 要转换成的类型
 * </span><span style="color: #808080">@return</span><span style="color: #008000"> 转换后的数组
 </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"> Object cast(Object array,Class clss){
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(</span><span style="color: #0000ff">null</span><span style="color: #000000">==</span><span style="color: #000000">clss)
 </span><span style="color: #0000ff">throw</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> IllegalArgumentException(</span><span style="color: #000000">"</span><span style="color: #000000">argument clss cannot be null</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(</span><span style="color: #0000ff">null</span><span style="color: #000000">==</span><span style="color: #000000">array)
 </span><span style="color: #0000ff">throw</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> IllegalArgumentException(</span><span style="color: #000000">"</span><span style="color: #000000">argument array cannot be null</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(</span><span style="color: #0000ff">false</span><span style="color: #000000">==</span><span style="color: #000000">array.getClass().isArray())
 </span><span style="color: #0000ff">throw</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> IllegalArgumentException(</span><span style="color: #000000">"</span><span style="color: #000000">argument array must be array</span><span style="color: #000000">"</span><span style="color: #000000">);
 
 Object[] src</span><span style="color: #000000">=</span><span style="color: #000000">(Object[])array;
 Object[] dest</span><span style="color: #000000">=</span><span style="color: #000000">(Object[])Array.newInstance(clss, src.length);
 System.arraycopy(src, </span><span style="color: #000000">0</span><span style="color: #000000">, dest, </span><span style="color: #000000">0</span><span style="color: #000000">, src.length);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> dest;
 }


}

</span></div>
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