catch语句中的return语句的行为

问题描述

请参阅以下代码并解释输出行为。

Please see the following code and explain the output behavior.

public class MyFinalTest {

    public int doMethod(){
        try{
            throw new Exception();
        }
        catch(Exception ex){
            return 5;
        }
        finally{
            return 10;
        }
    }

    public static void main(String[] args) {

        MyFinalTest testEx = new MyFinalTest();
        int rVal = testEx.doMethod();
        System.out.println("The return Val : "+rVal);
    }

}

结果是返回Val： 10。

The result is the return Val : 10.

Eclipse显示警告： finally块无法正常完成。

Eclipse shows a warning: finally block does not complete normally.

catch块中的return语句会发生什么？

What happens to the return statement in catch block ?

推荐答案

它被 finally ，因为 finally 在其他所有内容后执行。

It is overridden by the one in finally, because finally is executed after everything else.

这就是为什么，一个经验法则 - 永远不会从返回 。例如，Eclipse会显示该代码段的警告：finally块无法正常完成

That's why, a rule of thumb - never return from finally. Eclipse, for example, shows a warnings for that snippet: "finally block does not complete normally"

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