程序代码：

import java.util.Scanner;
public class H7323 {

    public static void main(String[] args) {
        Scanner a = new Scanner(System.in);

        System.out.println("请输入用户名：");
        String name = a.next();

        System.out.println("请输入密码：");
        int pin = a.nextInt();

        if ( "青".equals(name) && pin == 123) {
            System.out.print("欢迎你，青！");

        } else {
            System.out.print("对不起，你不是青！");
        }

}
}