Java案例用户登录
import java.util.Scanner;
//类可以实现接口 用关键字implements
public class Application{
public static void main(String[] args) {
for (int i = 1; i <= 3; i++) {
String User="admin";
String password ="123456";
Scanner scanner = new Scanner(System.in);
System.out.println("请输入用户名：");
String s1 = scanner.nextLine();
System.out.println("请输入密码：");
String s2 = scanner.nextLine();
if(s1.equals(User) && s2.equals(password)){
System.out.println("登录成功!");
break;
}else{
System.out.println("用户名或密码不正确！");
}
}
}
}