Sign in with simulated user String class

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• Login simulation, give three chances, and prompts as well as several opportunities
• analysis:

•  A.定义两个字符串对象，用于储存已经存在的用户名和密码
  

•  B.键盘录入用户名和密码
  

•  C.拿键盘录入的用户名和密码和已经存在的用户名和密码进行比较
  

•  	如果内容相同，提示登入成功
  

•  	如果内容不同，提示登入失败，并提示还有几次机会
  

import java.util.Scanner;


public class StringTest {
	public static void main(String[] args) {
		//定义两个字符串对象
		String username="admin";
		String password="admin";
		
		//给三次机会，用for循环实现
		for(int x=0;x<3;x++) {//0,1,2
			//键盘录入用户名和密码
			Scanner sc = new Scanner(System.in);
			System.out.println("请输入用户名：");
			String name=sc.nextLine();
			System.out.println("请输入密码：");
			String pwd=sc.nextLine();
			
			//拿键盘录入的用户名和密码和已经存在的用户名和密码进行比较
			if(username.equals(name)&&password.equals(pwd)) {
				System.out.println("登入成功");
				break;
				
			}else {
				if((2-x)==0) {
					System.out.println("用户名被锁定，请与管理员联系");
				}else {
					System.out.println("登入失败，你还有"+(2-x)+"次机会");//2,1,0
				}
			}
		}
	}
}