第二十四道Java小问题

以下哪段程序会编译出错:

1)

class A {
	void f ()
{
    try {}
}
}

 

2)

class A {
    void f() {
        try {
            throw new Exception();
        } catch (Exception e) {
        }
    }
}

 

3)

class A {
    void f() {
        try {
            throw new RuntimeException();
        } catch (NoSuchMethodException e) {
        }
    }
}

 

4)

class A {
    void f() {
        try {
        } finally {
        }
    }
}

 

5)

class A {
    void f() throws NoSuchMethodException {

        throw new RuntimeException();

    }

}

 

6)

class A {
    void f() {

        throw new RuntimeException();
        int i = 6;
    }

}

 

7)

class A {
    void f() {
        try {
        } catch (Exception e) {
        } catch (RuntimeException re) {
        }

    }

}