10.10

随机数模拟骰子滚动：

代码部分：

package lianxi;
import java.util.*;
import javax.swing.*;
public class bo {
    public static void main(String[] args) {
         int frequency1 = 0, frequency2 = 0,
                  frequency3 = 0, frequency4 = 0,
                  frequency5 = 0, frequency6 = 0, face;

              // summarize results
              for ( int roll = 1; roll <= 6000; roll++ ) {
                 face = 1 + (int) ( Math.random() * 6 );

                 switch ( face ) {
                    case 1:
                       ++frequency1;
                       break;
                    case 2:
                       ++frequency2;
                       break;
                    case 3:
                       ++frequency3;
                       break;
                    case 4:
                       ++frequency4;
                       break;
                    case 5:
                       ++frequency5;
                       break;
                    case 6:
                       ++frequency6;
                       break;
                 }
              }           JTextArea outputArea = new JTextArea( 7, 10 );
              outputArea.setText(
                 "Face\tFrequency" +
                 "\n1\t" + frequency1 +
                 "\n2\t" + frequency2 +
                 "\n3\t" + frequency3 +
                 "\n4\t" + frequency4 +
                 "\n5\t" + frequency5 +
                 "\n6\t" + frequency6 );              JOptionPane.showMessageDialog( null, outputArea,
                 "Rolling a Die 6000 Times",
                 JOptionPane.INFORMATION_MESSAGE );
              System.exit( 0 );
    }   
}

运行结果：