JAVA小练习110——使用Hashset实现注册功能，注册的时候如果用户名与密码一致，则视为同一个用户，不允许注册

以你之姓@ 2022-10-01 05:47 131阅读 0赞

import java.util.HashSet;
    import java.util.Scanner;
    
    class User{
    	
    	String userName;
    	
    	String password;
    
    	public User(String userName, String password) {
    		this.userName = userName;
    		this.password = password;
    	}
    	
    	@Override
    	public String toString() {
    		return "{ 用户名："+ this.userName+" 密码："+ this.password+"}";
    	}
    	
    	
    	@Override
    	public boolean equals(Object obj) {
    		User u = (User)obj;
    		return this.userName.equals(u.userName)&& this.password.equals(u.password);
    	}
    	
    	
    	//  狗娃  123   123 狗娃	
    	@Override
    	public int hashCode() {
    		return this.userName.hashCode()+ this.password.hashCode();
    	}
    }
    
    
    public class Demo110 {
    	
    	public static void main(String[] args) {
    		//定义一个集合用于存储用户
    		HashSet users = new HashSet();
    		Scanner scanner = new Scanner(System.in);
    		
    		while(true){
    			System.out.println("请输入用户名：");
    			String userName = scanner.next();
    			System.out.println("请输入密码：");
    			String password = scanner.next();
    			User  user = new User(userName, password);
    			if(users.add(user)){
    				System.out.println("添加用户成功..");
    			}else{
    				System.out.println("用户名与密码以存在，请重新注册!!");
    				
    			}
    			System.out.println("当前的用户："+ users);
    		}
    			
    		
    	}