import java.util.Scanner;
public class Login {
public static
// TODO Auto-generated method stub
int a = 0;
while(a<=19) {
System.out.println("====欢迎来到我的系统====");
System.out.println("1.注册n2.登录");
Scanner input = new Scanner(System.in);
String select = input.nextLine();
String [] user = new String[20];
String [] userpassword = new String[20];
//区分注册与登录
if(select.equals("1")) {
//注册
System.out.print("请输入用户名:");
String name=input.next();
System.out.print("请输入密码:");
String password =input.next();
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