基本游戏循环

import java.util.Scanner;

public class demon {
    public static void main(String[] args) {
        System.out.println("程序开始...");
        Scanner ipt = new Scanner(System.in);


        System.out.println("是否要开始游戏？");
        String choice = ipt.next();
        while (choice.equals("y")) {
            System.out.println("重复的内容");

            System.out.println("是否要开始游戏？");
            choice = ipt.next();
        }
        System.out.println("程序结束...");
    }
}

指定次数的游戏循环

import java.util.Scanner;

public class demon {
    public static void main(String[] args) {
        System.out.println("程序开始...");
        Scanner ipt = new Scanner(System.in);


        System.out.println("是否要开始游戏？");
        String choice = ipt.next();

        int counter = 3;

        while (choice.equals("y") && counter > 0) {
            counter--;
            System.out.println("还可以玩" + counter + "次");
            System.out.println("重复的内容");

            System.out.println("是否要开始游戏？");
            choice = ipt.next();
        }
        System.out.println("程序结束...");
    }
}