public class ExceptionTest_1 {
    public static void main(String[] args) {
        int result = 0;
        try {
            System.out.println("before result");
            result = 9 / 0;
            System.out.println("after result");
        } catch (Exception e) {
            System.out.println("exception" + e.getMessage() + ", result: " + result);
            return;
        } finally {
            System.out.println("final execute, " + result);
        }
        System.out.println("out of try statement, " + result);
    }
}

before result
exception/ by zero, result: 0
final execute, 0

before result
after result
final execute, 4
out of try statement, 4

public class ExceptionTest_2 {

    public static void main(String[] args) {
        try {
            if (1 + 2 > 2) {
                throw new FileNotFoundException();
            }
            try {
                throw new FileNotFoundException();
            } catch (FileNotFoundException e) {
                System.out.println("world hello");
            }
        } catch (Exception e) {
            System.out.println("hello world");
        } finally {
            System.out.println("final action");
        }
    }
}

hello world
final action

world hello
final action

当抛出异常后，会发生以下的事情。
1、用new在堆上创建异常对象，当前的执行路径被终止，并从当前环境中弹出异常对象的引用。
2、异常处理机制接管程序，并寻找一个恰当的地方继续执行程序。
3、如果有定义了final，那么会执行final块的代码。