代码块

public class Person {
    Person() {
        System.out.println(4);
    }

    public static void main(String[] args) {
        System.out.println(1);
        {
            int i = 2;
            System.out.println(i);
        }
        int i = 3;
        System.out.println(i);
        new Person();
    }
}

1
2
3
4