java入门第二季--继承--Object类

Object类toString()方法代码/javaDemo3/src/com/imooc/Animal.javapackage com.imooc;public class Animal { public Animal() { }}/javaDemo3/src/com/imooc/Dog.javapackage com.imooc;import java.util.;public class Dog extends Animal { public Dog() { System.out.println(“Dog类执行了” ); }}/javaDemo3/src/com/imooc/Initail.javapackage com.imooc;public class Initail { public static void main(String[] args) { // TODO Auto-generated method stub Dog dog = new Dog(); System.out.println(dog); }}重写toString()方法/javaDemo3/src/com/imooc/Dog.java右键 -> source -> genenor toString]package com.imooc;import java.util.;public class Dog extends Animal { public Dog() { System.out.println(“Dog类执行了” ); } public String toString() { return “Dog [age=” + age + “]”; }}