java - 异常处理 Try-catch : What happens if var 1 , 2 和 3 为 false

Question

我需要跟踪以下代码。会发生什么？我已经走到这一步了...

让我们开始(现在尝试 f)F 开始下一次抛出 Exc1，因为 var1 = false现在我要返回到 main 中尝试并转到方法 d 吗？

void main() {
    println("Let's start");
    try {
        f();
        d();
    } catch (Ex1 ex) {
        println("main caught Ex1");
    } catch (Ex3 ex) {
        println("main caught Ex3");
    } finally {
        println("main finally");
    }
    println("main end");
}

void f() {
    println("F begins");
    try {
        if (var1) {
            d();
        } else {
            throw new Ex1();
        }
    } catch (Ex2 ex) {
        println("f caught Ex2");
    }
    println("a end");
}

void d() {
    println("d begin");
    try {
        if (var2) throw new Ex2();
        if (var3) throw new Ex3();
    } catch (Ex3 ex) {
        println("d caught ex3");
    } finally {
        println("d finally");
    }
    println("d end");
}

Answer 1

在此代码中:

try {
    f();
    d();
} catch (Ex1 ex) {
    println("main caught Ex1");
} catch (Ex3 ex) {
    println("main caught Ex3");
} finally {
    println("main finally");
}

如果f()抛出异常，try block 将退出。无论是否捕获异常，main() 都不会调用d()。如果有catch block 捕获异常，则会执行该异常，然后执行finally block ；否则，finally block 将被执行，然后再次抛出异常。但在这两种情况下，d()都不会被调用。