ORM基础-对象识别之重写对象equals()和hashCode()方法

方法重写

package entity;
import java.util.Objects;
public class UserOver {
    private int id;
    private String name;
    private String gender;  
    // getter() and setter() 
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        UserOver user = (UserOver) o;
        return id == user.id &&
                Objects.equals(name, user.name) &&
                Objects.equals(gender, user.gender);
    }
    @Override
    public int hashCode() {       
        int result;       
        result = getName ().hashCode();       
        result = 29 * result + getBirthday().hashCode();     
        result = 29 * result + getAge();  
        return result;   
    }
}

测试

@Test
    public void testOverride(){
        System.out.println(u1 == u2);
        System.out.println(u1.equals(u2));
    }

运行结果