输入验证和再次播放循环 JAVA 作业时出现问题

Question

我的CS1课程的任务是创建一个类似于石头，纸，剪刀的游戏。输入为 1、2、3、4 和 5。我需要帮助弄清楚如何提示用户输入正确的输入，以防他们输入的数字不是 1-5。我还需要帮助插入"再玩一次？圈。请帮忙，我被困住了。我真的很挣扎。

import java.util.Scanner;
import java.util.Random;
public class Moropinzee {
public static void main(String[] args) {
String personPlay1;
String personPlay2;
String response;
Scanner scan = new Scanner(System.in);
Random generator = new Random();
System.out.println("Hey, Let's Play Moropinzee!n" + "Please enter a move.n"
+ "Monkey = 1, Robot = 2, Pirate = 3, Ninja= 4, and Zombies = 5.");
System.out.println("Player 1 plays: ");
personPlay1 = scan.next();
System.out.println("Player 2 plays ");
personPlay2 = scan.next();
if (personPlay1.equals(personPlay2))
System.out.println("It's a tie!");
else if (personPlay1.equals("1"))
if (personPlay2.equals("2"))
System.out.println("Monkey unplugs Robot. Player 1 win!!");
if (personPlay1.equals("2"))
if (personPlay2.equals("1"))
System.out.println("Monkey unplugs Robot. Player 2 win!!");
if (personPlay1.equals("1"))
if (personPlay2.equals("3"))
System.out.println("Pirate skewers Monkey. Player 2 win!!");
if (personPlay1.equals("3"))
if (personPlay2.equals("1"))
System.out.println("Pirate skewers Monkey. Player 1 win!!");
if (personPlay1.equals("1"))
if (personPlay2.equals("4"))
System.out.println("Monkey fools Ninja. Player 1 win!!");
if (personPlay1.equals("4"))
if (personPlay2.equals("1"))
System.out.println("Monkey fools Ninja. Player 2 win!!");
if (personPlay1.equals("1"))
if (personPlay2.equals("5"))
System.out.println("Zombie savages Monkey. Player 2 win!!");
if (personPlay1.equals("5"))
if (personPlay2.equals("1"))
System.out.println("Zombie savages Monkey. Player 1 win!!");
if (personPlay1.equals("2"))
if (personPlay2.equals("3"))
System.out.println("Pirate drowns Robot. Player 2 win!!");
if (personPlay1.equals("3"))
if (personPlay2.equals("2"))
System.out.println("Pirate drowns Robot. Player 1 win!!");
if (personPlay1.equals("2"))
if (personPlay2.equals("4"))
System.out.println("Robot chokes Ninja. Player 1 win!!");
if (personPlay1.equals("4"))
if (personPlay2.equals("2"))
System.out.println("Robot chokes Ninja. Player 2 win!!");
if (personPlay1.equals("2"))
if (personPlay1.equals("5"))
System.out.println("Robot crushes Zombie. Player 1 win!!");
if (personPlay1.equals("5"))
if (personPlay1.equals("2"))
System.out.println("Robot crushes Zombie. Player 2 win!!");
if (personPlay1.equals("3"))
if (personPlay2.equals("4"))
System.out.println("Ninja karate chops Pirate. Player 2 win!!");
if (personPlay1.equals("4"))
if (personPlay2.equals("3"))
System.out.println("Ninja karate chops Pirate. Player 1 win!!");
if (personPlay1.equals("3"))
if (personPlay2.equals("5"))
System.out.println("Zombie eats Pirate. Player 2 win!!");
if (personPlay1.equals("5"))
if (personPlay2.equals("3"))
System.out.println("Zombie eats Pirate. Player 1 win!!");
if (personPlay1.equals("4"))
if (personPlay2.equals("5"))
System.out.println("Ninja decapitates Zombie. Player 1 win!!");
if (personPlay1.equals("5"))
if (personPlay2.equals("4"))
System.out.println("Ninja decapitates Zombie. Player 2 win!!");
else {
}
}
}

Answer 1

首先考虑为您的消息创建一个数组

String [][] msgs = new String [6][6];
msgs[1][2] = "Monkey unplugs Robot. Player 1 win!!";
msgs[2][1] = "Monkey unplugs Robot. Player 2 win!!";
// etc
Scanner scan = new Scanner(System.in); 
// get input
while (true) {
System.out.println("enter number 1 or -1 to quit");
int num1 = scan.nextInt();
if (num1 == -1) break;
if (num1 < 1 || num1> 5) {
continue;
}
System.out.println("enter number 2");
int num2 = scan.nextInt();
if (num2 < 1 || num2> 5) {
continue;
}
System.out.println(msgs[num1][num2]);
}

当然，您需要将所有消息添加到数组中，并且您可能希望对无效输入进行进一步测试，但至少此方法可以防止大量重复的代码。

Answer 2

Scary Wombat 提供的代码大多数都OK，但是您应该使用两个 while 循环(而不是一个(以避免从一开始就重复程序。并且不要忘记在他们完成任务后打破两个循环。

import java.util.Scanner;
public class Moropinzee {
public static void main(String[] args) {
int Player1;
int Player2;
String [][] results = new String [6][6];
results[1][2] = "Monkey unplugs Robot. Player 1 win!!";
results[2][1] = "Monkey unplugs Robot. Player 2 win!!";
results[1][3] = "Pirate skewers Monkey. Player 2 win!!";
results[3][1] = "Pirate skewers Monkey. Player 1 win!!";
results[1][4] = "Monkey fools Ninja. Player 1 win!!";
results[4][1] = "Monkey fools Ninja. Player 2 win!!";
results[1][5] = "Zombie savages Monkey. Player 2 win!!";
results[5][1] = "Zombie savages Monkey. Player 1 win!!";
results[2][3] = "Pirate drowns Robot. Player 2 win!!";
results[3][2] = "Pirate drowns Robot. Player 1 win!!";
results[2][4] = "Robot chokes Ninja. Player 1 win!!";
results[4][2] = "Robot chokes Ninja. Player 2 win!!";
results[2][5] = "Robot crushes Zombie. Player 1 win!!";
results[5][2] = "Robot crushes Zombie. Player 2 win!!";
results[3][4] = "Ninja karate chops Pirate. Player 2 win!!";
results[4][3] = "Ninja karate chops Pirate. Player 1 win!!";
results[3][5] = "Zombie eats Pirate. Player 2 win!!";
results[5][3] = "Zombie eats Pirate. Player 1 win!!";
results[4][5] = "Ninja decapitates Zombie. Player 1 win!!";
results[5][4] = "Ninja decapitates Zombie. Player 2 win!!";
Scanner scan = new Scanner(System.in);
System.out.println("Hey, Let's Play Moropinzee!n" + "Please enter a move.n"
+ "Monkey = 1, Robot = 2, Pirate = 3, Ninja= 4, and Zombies = 5.");

while (true) {      
System.out.println("Player 1 plays: ");
Player1 = scan.nextInt();
if (Player1 < 1 || Player1 > 5) {System.out.println("Please, enter a number in a range 1-5!!!");
continue;}
while (true) {
System.out.println("Player 2 plays ");
Player2 = scan.nextInt();
if (Player2 < 1 || Player2 > 5) {System.out.println("Please, enter a number in a range 1-5!!!");
continue;}
if (Player1==Player2) System.out.println("It's a tie!");
else System.out.println(results[Player1][Player2]);
System.out.println();
break;
} 
System.out.println("Enter Yes (Y or y) if you'd like to continue, or any other letter to quit");
String choise = scan.next();
if (choise.equals("Y") || choise.equals("y")) continue;
else System.out.println("The game is over.");
break;
}
}
}