1 public class Study2 { 2     public static void main(String[] args) { 3         for (int x = 0; x <= 20; x++) { 4             for (int y = 0; y <= 33; y++) { 5                 for (int z = 0; z <= 100; z += 2) { 6                     if (x + y + z == 100 && (5 * x + 3 * y + z / 3) == 100) { 7                         System.out.printf("公鸡%d只\t" + "母鸡%d只\t" + "小鸡%d只\t",x,y,z); 8                         System.out.println(); 9                     }10                 }11 12             }13 14         }15 16     }17 }

 1 import java.util.Scanner; 2  3 public class Test2 { 4     public static void main(String[] args) { 5         Scanner sc = new Scanner(System.in); 6         System.out.print("请输入投注数:"); 7         if (sc.hasNextInt()) { 8             int n = sc.nextInt(); 9             if (n > 0) {10                 for (int i = 1; i <= n; i++) {11                     for (int j = 1; j <= 7; j++) {12 13                         System.out.print((int)( Math.random() * 10) + "");14 15                     }16                     System.out.println();17                 }18             }19 20         }21     }22 }

 1 public class Test4 { 2     public static int roll() { 3         return (int) (Math.random() * 6 + 1); 4     } 5  6     public static void main(String[] args) { 7         int a, b, sum = 1000; 8         do{ 9         a = b = roll() + roll();10         System.out.printf("你摇出了:%d点\n", b);11         12          13             boolean goon = false;14             switch (b) {15             case 7:16             case 11:17                 System.out.println("you win");18                 sum += 100;19                 break;20 21             case 2:22             case 3:23             case 12:24                 System.out.println("you lose");25                 sum -= 100;26                 break;27 28             default:29                 goon = true;30             }31             while (goon) {32                 b = roll() + roll();33                 System.out.printf("你摇出了:%d点\n", b);34                 if (b == 7) {35                     System.out.println("you lose");36                     sum -= 100;37                     goon=false;        38                 } else if (b == a) {39                     System.out.println("you win");40                     sum -= 100;41                     goon=false;42                 }43             }44 45         } while (sum > 0);46 47         System.out.println("你输完了");48 49     }50 }