通用的数组到数组强制转换的工具函数

短命女 2022-09-18 07:51 57阅读 0赞

平时做JAVA总是会遇到强制转换的时候,一般单个对象强制转换很方便,

例如B b=null; A a=(A)b;

但是, B\[\] b=null; A\[\] a=(A\[\])b 却会导致异常发生,为了解决这个问题,我们不得不对数组中每个元素单独进行强制转换,

for(int i=0;i<b.length;i++)

a\[i\]=(A)b\[i\];

如果只有这么两种类型进行转换也好,要是还有C类型到D类型等等很多其他类型怎么办? 鉴于这个原因,我写了一个通用的强制对数组进行转换的函数,对于上面这个转换只需要调用 A\[\] a=(A\[\])TestCast.cast(b,A.class) 就可以解决问题,很是方便;具体代码如下:

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

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