java面试----题库2

Posted 2022-03-31 yanxiaoge

输出？

class X 
    Y b = new Y();
    X() 
        System.out.print("X");
    

class Y 
    Y() 
        System.out.print("Y");
    


public class UserDao extends X
        Y y = new Y();
        UserDao()
            System.out.print("Z");
        
        public static void main(String[] args) 
            new UserDao();
        

先初始化父类数据，在初始化子类数据。结果 YXYZ