java面向对象object类（public String toString() {} 和 public boolean equals(Object obj) {})

最新推荐文章于 2024-06-11 06:00:00 发布

chuanluwang

最新推荐文章于 2024-06-11 06:00:00 发布

阅读量2.3k

点赞数

CC 4.0 BY-SA版权

文章标签： java

本文链接：https://blog.youkuaiyun.com/chuanluwang/article/details/78779250

本文介绍了一个简单的Java程序，包括猫和狗两个宠物类的定义及其属性和方法。通过实例化这些类并调用方法，展示了如何比较不同对象的等价性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Cat:

package Animal;

public class Cat {
private String name;
private String color;
private int age;
public Cat(String name, String color, int age) {
this.name = name;
this.color = color;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}

@Override
public String toString() {
return "名字1："+this.name+"，颜色1："+this.color+"，年龄1："+this.age;
}

@Override
public boolean equals(Object obj) {
boolean isSame=false;
if(obj instanceof Cat){
Cat cat=(Cat) obj;
if(this.name==cat.getName()&&this.color==cat.getColor()&&this.age==cat.getAge()){
isSame=true;
}

}
return isSame;
}

}

Dog:

package Animal;

//public class Dog extends Object
public class Dog {
private String name;
private String color;
private int age;

public Dog(String name, String color, int age) {
this.name = name;
this.color = color;
this.age = age;
}

@Override
public String toString() {
return "名字："+this.name+"，颜色："+this.color+"，年龄："+this.age;
}

@Override
public boolean equals(Object obj) {
boolean isSame=false;
if(obj instanceof Dog){
Dog d=(Dog) obj;
if(this.name==d.getName()&&this.color==d.getColor()&&this.age==d.getAge()){
isSame=true;
}

}
return isSame;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getColor() {
return color;
}

public void setColor(String color) {
this.color = color;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

}

Test:

package Animal;

import org.junit.Test;

public class test {
@Test
public void test(){
Dog daidai=new Dog("erha","black", 4);
System.out.println(daidai);
System.out.println(daidai.toString());

Cat cat1=new Cat("crazy","white",3);
System.out.println(cat1);
System.out.println(cat1.toString());
}
@Test
public void test1(){
Dog daidai=new Dog("erha","black", 4);
Dog daidai1=new Dog("erha","black", 4);
Dog dd=new Dog("erha","black", 1);

if(daidai.equals(daidai1)){
System.out.println("yes,yes.");
}else{
System.out.println("no,no,no");
}

Cat cat1=new Cat("erha","black", 4);
Cat cat2=new Cat("erha","black", 4);
Cat cat3=new Cat("erha","black", 1);
if(cat1.equals(cat2)){
System.out.println("y1es,y1es.");
}else{
System.out.println("1no,1no,1no");
}
}
}