java-equals重写

package cn.sxt.oo2;

import java.util.Objects;

public class TestEquals {
	public static void main(String[] agrs) {
		Object obj;
		String str;
		
		User u1 = new User(1000, "jcc", "123456");
		User u2 = new User(1000, "gao", "123456");
		
		System.out.println(u1 == u2);
		System.out.println(u1.equals(u2));
/*
		String str1 = new String("sxt");
		String str2 = new String("sxt");
		System.out.println(str1 == str2);	//false;
		System.out.println(str1.equals(str2));	//true;因为他们字符串是相同的
*/
	
	}
}

class User{
	int id;
	String name;
	String pwd;
	public User(int id, String name, String pwd) {
		super();
		this.id = id;
		this.name = name;
		this.pwd = pwd;
	}
	@Override
	public int hashCode() {
		return Objects.hash(id);
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		User other = (User) obj;
		return id == other.id;
	}
	
	
	
	
}