摘要:类方法代码类执行了重写方法右键类执行了两个对象是相等的两个对象是不相等的重写右键年龄狗可以吃东西类执行了两个对象是相等的两个对象是不相等的
Object类 toString()方法
/javaDemo3/src/com/imooc/Animal.java
package com.imooc; public class Animal { public Animal() { } }
/javaDemo3/src/com/imooc/Dog.java
package 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.java
package 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 + "]"; } }equals
/javaDemo3/src/com/imooc/Initail.java
package com.imooc; public class Initail { public static void main(String[] args) { Dog dog = new Dog(); Dog dog2 = new Dog(); if(dog.equals(dog2)) { System.out.println("两个对象是相等的"); }else { System.out.println("两个对象是不相等的"); } } }
重写equals
右键-> source-> generate->hascode equals
/javaDemo3/src/com/imooc/Dog.java
package com.imooc; import java.util.*; public class Dog extends Animal { public int age = 20; public void eat() { System.out.println("年龄:"+age+ "狗可以吃东西" ); } public Dog() { System.out.println("Dog类执行了" ); } public void method() { System.out.println(age); System.out.println("super" + super.age); eat(); super.eat(); } public String toString() { return "Dog [age=" + age + "]"; } public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Dog other = (Dog) obj; if (age != other.age) return false; return true; } }
/javaDemo3/src/com/imooc/Initail.java
package com.imooc; public class Initail { public static void main(String[] args) { Dog dog = new Dog(); Dog dog2 = new Dog(); if(dog.equals(dog2)) { System.out.println("两个对象是相等的"); }else { System.out.println("两个对象是不相等的"); } } }
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