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try
{
normal statement;
//1.
exception occurred;
//2.
return
"try"
;
}
catch
(Exception ex) {
normal statement;
//3.
return
"catch"
;
}
finally
{
normal statement;
//4.
return
"finally"
;
//5. -->End
}
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try
{
normal statement;
//1.
exception occurred;
//2.
return
"try"
;
}
catch
(Exception ex) {
normal statement;
//3.
return
"catch"
;
//5. -->End
}
finally
{
normal statement;
//4.
}
|
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try
{
normal statement;
//1.
exception occurred;
//2.
return
"try"
;
}
catch
(Exception ex) {
normal statement;
//3.
throw
Exception;
}
finally
{
normal statement;
//4.
return
"finally"
;
//5. -->End
}
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try
{
normal statement;
//1.
exception occurred;
//2.
return
"try"
;
}
catch
(Exception ex) {
normal statement;
//3.
throw
Exception;
}
finally
{
normal statement;
//4.
throw
Exception;
//5. -->End
}
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try
{
normal statement;
//1.
exception occurred;
//2.
return
"try"
;
}
catch
(Exception ex) {
normal statement;
//3.
throw
Exception;
//5. -->End
}
finally
{
normal statement;
//4.
}
|
结论：
1、Try-catch-finally中的finally一定会执行，而且，一定优先于try/catch中的return/throw语句执行，除非系统崩了或者程序使用System.exit(0)强行终止；
2、finally中如果有return或throw，则优先处理finally中的return/throw；
3、return和throw，从语句流转的角度上看，这两个语句是等效的；
4、finally中没有return或throw，则程序会回溯到try/catch中执行return/throw语句。如果当初是catch=>finally，则回溯到catch中执行return/throw；如果是try=>finally，则回溯到try中执行return/throw；如果try/catch中都不存在return/throw，则跳出try-catch-finally语句体继续执行后续代码。
本文转自 rickqin 51CTO博客，原文链接:http://blog.51cto.com/rickqin/1868754
