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摘要：類方法代碼類執(zhí)行了重寫方法右鍵類執(zhí)行了兩個對象是相等的兩個對象是不相等的重寫右鍵年齡狗可以吃東西類執(zhí)行了兩個對象是相等的兩個對象是不相等的
Object類 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類執(zhí)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);
}
}
重寫toString()方法
/javaDemo3/src/com/imooc/Dog.java
右鍵 -> source -> genenor toString
]
package com.imooc;
import java.util.*;
public class Dog extends Animal {
public Dog() {
System.out.println("Dog類執(zhí)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("兩個對象是相等的");
}else {
System.out.println("兩個對象是不相等的");
}
}
}
重寫equals
右鍵-> 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("年齡:"+age+ "狗可以吃東西" );
}
public Dog() {
System.out.println("Dog類執(zhí)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("兩個對象是相等的");
}else {
System.out.println("兩個對象是不相等的");
}
}
}
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