階段一 ~~~ import java.util.*; public class Test{ public static void main(String[] args){ Scanner in =new Scanner(System.in); System.out.println("------猜拳游戲------"); System.out.println("請出拳（1.剪刀 2.石頭 3.布）"); int p = in.nextInt(); int c = (int)(Math.random()*3)+1; System.out.println(c); } } ~~~ 階段二 ~~~ import java.util.*; public class Test{ public static void main(String[] args){ Scanner in =new Scanner(System.in); System.out.println("------猜拳游戲------"); System.out.println("請出拳（1.剪刀 2.石頭 3.布）"); int p = in.nextInt(); int c = (int)(Math.random()*3)+1; if(p==c){ System.out.println("平局"); }else if(p==1&&c==2||p==2&&c==3||p==3&&c==0){ System.out.println("你輸了"); }else{ System.out.println("你贏了"); } } } ~~~ 階段三 ~~~ import java.util.*; public class Test{ public static void main(String[] args){ Scanner in =new Scanner(System.in); System.out.println("------猜拳游戲------"); System.out.println("請出拳（1.剪刀 2.石頭 3.布）"); int p = in.nextInt(); int c = (int)(Math.random()*3)+1; String marks="拳頭";//這是做一個標記 String marks2="拳頭";//這是做一個標記 switch(p){ case 1: marks="剪刀"; break; case 2: marks="石頭"; break; case 3: marks="布"; break; } switch(c){ case 1: marks2="剪刀"; break; case 2: marks2="石頭"; break; case 3: marks2="布"; break; } if(p==c){ System.out.println("你出的是"+marks+"，電腦出的是"+marks2+"，平局"); }else if(p==1&&c==2||p==2&&c==3||p==3&&c==0){ System.out.println("你出的是"+marks+"，電腦出的是"+marks2+"，你輸了"); }else{ System.out.println("你出的是"+marks+"，電腦出的是"+marks2+"，你贏了"); } } } ~~~