数组 课后作业2

 1 import java.util.Random;
 2 import javax.swing.*;
 3 public class Test {
 4     public static void main(String args[])
 5     {
 6         Random random = new Random();
 7         String output = " ";
 8         int a[] = new int[10];
 9         for(int i = 0;i<a.length;i++)
10         {
11             a[i]=random.nextInt(1000);
12             //a[i]=(int)(Math.random()*1000);
13         }
14         output += "Subscript\tValue\n";
15         for(int i = 0;i<a.length;i++)
16         {
17             output += i+1 + "\t" + a[i] + "\n";
18         }
19         
20         int sum = 0;
21         for(int i = 0;i<a.length;i++)
22         {
23             sum += a[i];    
24         }
25         output += "\nsum" + "\t" + sum;
26         JTextArea outputArea = new JTextArea(12,11);
27         outputArea.setText( output );
28         JOptionPane.showMessageDialog(null, outputArea, "result", JOptionPane.INFORMATION_MESSAGE);
29     }
30 
31 }