histogram.java

经典的<<C how to program>一书第三版的例程。非常适合于C的初学者。

// Fig. 25.20: Histogram.java
// Histogram printing program
import javax.swing.*;

public class Histogram {
   public static void main( String args[] )
   {
      int n[] = { 19, 3, 15, 7, 11, 9, 13, 5, 17, 1 };
      String output = "";   

      output += "Element\tValue\tHistogram";
   
      for ( int i = 0; i < n.length; i++ ) {
         output += "\n" + i + "\t" + n[ i ] + "\t";

         for ( int j = 1; j <= n[ i ]; j++ ) // print a bar
            output += "*";
      }

      JTextArea outputArea = new JTextArea( 11, 30 );
      outputArea.setText( output );

      JOptionPane.showMessageDialog( null, outputArea,
         "Histogram Printing Program",
         JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );
   }
}

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