重写equals方法

package object;

public class Test {
    public static void main(String[] args) {
        Person person1=new Person();
        person1.setName("ZTT");
        
        Person person2=new Person();
        person2.setName("ZTT");
        
        System.out.println(person1.name.equals(person2.name));//结果:true
        
    }
}

我们都知道equals比较的是内容，很明显上面的结果是true.

然而equals方法的参数对象是Object,那Person也是对象，如果直接使得person.equals(person2)结果又如何呢，答案是false,因为在equals方法中用的是==，比较的是地址，让我们重写Person的equals方法

使得结果为true.

重写equals方法：

package object;

public class Person {
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    String name;
    int age;
    
    @Override
    public boolean equals(Object obj) {
        Person person=(Person)obj;
        /*if(person.name.equals(name)&&person.age==age){
            return true;
        }
        return false;*/
        return person.name.equals(name)&&person.age==age;
        
    }
    
}

package object;

public class Test {
    public static void main(String[] args) {
        Person person1=new Person();
        person1.setName("ZTT");
        person1.setAge(10);
        
        Person person2=new Person();
        person2.setName("ZTT");
        person2.setAge(10);
        
        System.out.println(person1.equals(person2));//结果:true
        
    }
}