try-catch-finally

代码语言：javascript复制

public class Main {

    public static void main(String[] args) {
        System.out.println("返回："WithException());
    }

    public static int WithException() {
        int i = 10;
        try {
            System.out.println("i in try block is ： "   i);
            i = i / 0;
            return --i;
        } catch (Exception e) {
            System.out.println("i in catch - form try block is ： "   i);
            --i;
            System.out.println("i in catch block is ： "   i);
            return --i;
        } finally {
            System.out.println("i in finally - from try or catch block is--"   i);
            --i;
            System.out.println("i in finally block is--"   i);
             return --i;
        }
    }
}

输出：

代码语言：javascript复制

i in try block is ： 10
i in catch - form try block is ： 10
i in catch block is ： 9
i in finally - from try or catch block is--8
i in finally block is--7
返回：6

如果改为下面（最后的return语句）：

代码语言：javascript复制

public class Main {

    public static void main(String[] args) {
        System.out.println(WithException());
    }

    public static int WithException() {
        int i = 10;
        try {
            System.out.println("i in try block is ： "   i);
            i = i / 0;
            return --i;
        } catch (Exception e) {
            System.out.println("i in catch - form try block is ： "   i);
            --i;
            System.out.println("i in catch block is ： "   i);
            return --i;
        } finally {
            System.out.println("i in finally - from try or catch block is--"   i);
            --i;
            System.out.println("i in finally block is--"   i);
            // return --i;
        }
    }
}

输出：

代码语言：javascript复制

i in try block is ： 10
i in catch - form try block is ： 10
i in catch block is ： 9
i in finally - from try or catch block is--8
i in finally block is--7
返回：8

总结： 1、finally语句中没有return时，执行完try或catch语句的return之后还会执行finally。（而return的值会暂存在栈里面，等待finally执行后再返回） 2、finally语句中有return时，依然会执行try或catch语句的return，但是最终返回的是finally语句中的return。

return

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