e4_6.java

来自「java 初学者学习实例」· Java 代码 · 共 51 行

// Fig. 7.4: InitArray.java
// Initialize array with the even integers from 2 to 20.
import javax.swing.*;

public class E4_6 {

   public static void main( String args[] )
   {
      final int ARRAY_LENGTH = 10;    // constant
      int array[];                    // reference to int array

      array = new int[ ARRAY_LENGTH ];  // create array

      // calculate value for each array element
      for ( int counter = 0; counter < array.length; counter++ )
         array[ counter ] = 2 + 2 * counter;

      String output = "Index\tValue\n";
   
      for ( int counter = 0; counter < array.length; counter++ )
         output += counter + "\t" + array[ counter ] + "\n";

      JTextArea outputArea = new JTextArea();
      outputArea.setText( output );

      JOptionPane.showMessageDialog( null, outputArea,
         "Initializing to Even Numbers from 2 to 20",
         JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );

   } // end main

} // end class InitArray


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