// Fig. 7.9: PassArray.java
// Passing arrays and individual array elements to methods.
import java.awt.Container;
import javax.swing.*;

public class PassArray extends JApplet {

   // initialize applet 
   public void init()
   {
      JTextArea outputArea = new JTextArea();
      Container container = getContentPane();
      container.add( outputArea );

      int array[] = { 1, 2, 3, 4, 5 };
      
      String output = "Effects of passing entire array by reference:\n" +
         "The values of the original array are:\n";

      // append original array elements to String output 
      for ( int counter = 0; counter < array.length; counter++ )
         output += "   " + array[ counter ];
   
      modifyArray( array );  // array passed by reference
   
      output += "\n\nThe values of the modified array are:\n";

      // append modified array elements to String output 
      for ( int counter = 0; counter < array.length; counter++ )
         output += "   " + array[ counter ];
   
      output += "\n\nEffects of passing array element by value:\n" +
         "array[3] before modifyElement: " + array[ 3 ];
   
      modifyElement( array[ 3 ] );  // attempt to modify array[ 3 ]
   
      output += "\narray[3] after modifyElement: " + array[ 3 ];
      outputArea.setText( output );
     
   } // end method init
   
   // multiply each element of an array by 2 
   public void modifyArray( int array2[] )
   {
      for ( int counter = 0; counter < array2.length; counter++ )
         array2[ counter ] *= 2;
   }
   
   // multiply argument by 2
   public void modifyElement( int element )
   {
      element *= 2;
   }   
     
} // end class PassArray



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