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

刺骨的言语ヽ痛彻心扉 2022-06-02 22:37 199阅读 0赞

**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");  
\}  
\}  
\}