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          1、Message.java
          public class Message {

           public static void main(String[] args) {
              if (args[0].equals("-h"))
                    System.out.print("Hello,");
                 else if (args[0].equals("-g"))
                    System.out.print("Goodbye,");
                 // print the other command line arguments
                 for (int i = 1; i < args.length; i++)
                    System.out.print(" " + args[i]);
                 System.out.println("!");

           }
          }

          test:
          java Message -g cruel world



          import java.util.*;
          import javax.swing.*;
          public class FirstSample {

           public static void main(String[] args) {
                 String input = JOptionPane.showInputDialog
                    ("How many numbers do you need to draw?");
                 int k = Integer.parseInt(input);

                 input = JOptionPane.showInputDialog
                    ("What is the highest number you can draw?");
                 int n = Integer.parseInt(input);

                 // fill an array with numbers 1 2 3 . . . n
                 int[] numbers = new int[n];
                 for (int i = 0; i < numbers.length; i++)
                 {    numbers[i] = i + 1;
                 System.out.println(numbers[i]);
                 }
                 // draw k numbers and put them into a second array

                 int[] result = new int[k];
                 for (int i = 0; i < result.length; i++)
                 { 
                    // make a random index between 0 and n - 1
                    int r = (int)(Math.random() * n);

                    // pick the element at the random location
                    result[i] = numbers[r];

                    // move the last element into the random location
                    numbers[r] = numbers[n - 1];
                    n--;
                 }

                 // print the sorted array

                 Arrays.sort(result);
                 System.out.println
                    ("Bet the following combination. It'll make you rich!");
                 for (int i = 0; i < result.length; i++)
                    System.out.println(result[i]);

                 System.exit(0);

           }
          }

          posted on 2005-09-05 10:51 my java 閱讀(218) 評論(0)  編輯  收藏

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