我正在尝试创建一个石头、纸、剪刀、蜥蜴、spock 程序,该程序会不断重复,直到用户选择退出。但是,我无法弄清楚如何使程序循环。它在一场比赛后一直退出。我认为这可能与我的 while 语句的设置方式有关,但我不完全确定如何解决它。谢谢。
import java.util.Scanner;
import java.util.Random;
public class project2_rpsls {
public static void main(String[] args)
{
int round=0;
String uMove = null, cMove = null/*, loop*/;
Scanner scan=new Scanner(System.in);
/*System.out.println("Would you like to play?");
loop=scan.next();
loop=loop.toUpperCase();
while (loop.equals("Y"))*/
while (round>=0)
{
round++;
}
//get the moves
{
uMove = getuMove();
cMove = getcMove();
}
//Determining the winner
{
String winner;
if (cMove.equals(uMove))
{
winner="It was a tie!";
}
else if (uMove.equals("ROCK") && cMove.equals("LIZARD") ||
uMove.equals ("ROCK") && cMove.equals("SCISSORS"))
{
winner="You Win!";
}
else if (uMove.equals("PAPER") && cMove.equals("ROCK") ||
uMove.equals ("PAPER") && cMove.equals("SPOCK"))
{
winner="You Win!";
}
else if (uMove.equals("SCISSORS") && cMove.equals("PAPER") ||
uMove.equals ("SCISSORS") && cMove.equals("LIZARD"))
{
winner="You Win!";
}
else if (uMove.equals("LIZARD") && cMove.equals("SPOCK") ||
uMove.equals ("LIZARD") && cMove.equals("PAPER"))
{
winner="You Win!";
}
else if (uMove.equals("SPOCK") && cMove.equals("SCISSORS") ||
uMove.equals ("SPOCK") && cMove.equals("ROCK"))
{
winner="You Win!";
}
else
{
winner="You Lose!";
}
System.out.println("The computer picked " + cMove + " -- " + winner);
}
scan.close();
}
//Get user's move
private static String getuMove()
{
Scanner scan=new Scanner(System.in);
String uMove="test";
while (!uMove.equals("ROCK") &&
!uMove.equals ("PAPER")&&
!uMove.equals("SCISSORS")&&
!uMove.equals("LIZARD")&&
!uMove.equals("SPOCK"))
{
System.out.println("Please enter your move: ");
uMove=scan.next();
uMove=uMove.toUpperCase();
}
scan.close();
return uMove;
}
//Get computer's move
private static String getcMove() {
String cMove;
Random cMoveInt = new Random();
int rnum;
rnum=cMoveInt.nextInt(5);
{
if (rnum == 1) {
cMove = "ROCK";
}
else if (rnum == 2) {
cMove = "PAPER";
}
else if (rnum == 3){
cMove = "SCISSORS";
}
else if (rnum == 4){
cMove = "LIZARD";
}
else {
cMove = "SPOCK";
}
}
return cMove;
}
}
感谢您的指点。在我将我的 while 循环更改为
while (round>=0)
{
round++;
//get the moves
uMove = getuMove();
cMove = getcMove();
//Determining the winner
{
String winner;
...etc.
我收到以下错误。
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at project2_rpsls.getuMove(project2_rpsls.java:82)
at project2_rpsls.main(project2_rpsls.java:22)
根据我的研究,我的扫描仪似乎没有找到任何要阅读的内容,但我不知道如何阅读,因为它应该是在阅读用户输入。