Create another exception class called DuplicateValueException that will be thrown if the user inputs a value that already resides in the array. Modify your solution of the previous project to use this new exception class to indicate when a duplicate value is input, in which case an appropriate error message should be displayed. The program should continue normal execution after handling the exception.

// ArrayAccess.java

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class ArrayAccess extends JFrame

{

private JTextField inputField;

private JTextField retrieveField1;

private JTextField retrieveField2;

private JTextField outputField;

private JPanel inputArea;

private JPanel retrieveArea;

private JPanel outputArea;

private int num;

private int index = 0;

private int array[] = new int[ 6 ];

private String result;

// set up GUI

public ArrayAccess()

{

super( "Accessing Array values" );

setLayout( new FlowLayout() );

// set up input Panel

inputArea = new JPanel();

inputArea.add( new JLabel( "Enter array elements here" ) );

inputField = new JTextField( 10 );

inputArea.add( inputField );

inputField.addActionListener(

new ActionListener()

{

public void actionPerformed( ActionEvent e )

{

try {

// reads the number entered in the inputField

int element = Integer.parseInt(inputField.getText());

// Assign element to the next index in the array

array[index] = element;

// Increments instance variable index

index++;

} catch (NumberFormatException ex) {

// Throw NumberFormatException

throw new NumberFormatException("Please enter elements in correct format");

} catch (ArrayIndexOutOfBoundsException ex) {

// Throw ArrayIndexOutOfBoundsException

throw new ArrayIndexOutOfBoundsException("Please enter elements in correct format");

}

inputField.setText( "" );

} // end method actionPerformed

} // end anonymous inner class

); // end call to addActionListener

// set up retrieve Panel

retrieveArea = new JPanel( new GridLayout( 2, 2 ) );

retrieveArea.add( new JLabel( "Enter number to retrieve" ) );

retrieveField1 = new JTextField( 10 );

retrieveArea.add( retrieveField1 );

retrieveField1.addActionListener(

new ActionListener()

{

public void actionPerformed( ActionEvent event )

{

try {

// reads the number entered in the inputField

int element = Integer.parseInt(retrieveField1.getText());

String text = "The index's are :";

// Search the element in array

for(int i =0 ; i<6; i++){

// If element is found

if(array[i]==element){

// Print the index where element is found

outputField.setText(text+i+",");

}

else{

// If number is not found throw exception

throw new NumberNotFoundException("Number Not found in array");

}

}

} catch (NumberFormatException ex) {

// Throw NumberFormatException

throw new NumberFormatException("Please enter elements in correct format");

} catch (NumberNotFoundException ex) {

}

retrieveField1.setText( "" );

} // end method actionPerformed

} // end anonymous inner class

); // end call to addActionListener

retrieveArea.add( new JLabel( "Enter index to retrieve" ) );

retrieveField2 = new JTextField( 10 );

retrieveArea.add( retrieveField2 );

retrieveField2.addActionListener(

new ActionListener()

{

public void actionPerformed( ActionEvent event )

{

try {

// reads the number entered in the inputField

int index = Integer.parseInt(retrieveField2.getText());

// Store the value at index in number variable

int value = array[index];

// Output the value found at index

outputField.setText(Integer.toString(value));

} catch (NumberFormatException ex) {

// Throw NumberFormatException

throw new NumberFormatException("Please enter elements in correct format");

}catch (ArrayIndexOutOfBoundsException ex) {

// Throw ArrayIndexOutOfBoundsException if index not found

throw new ArrayIndexOutOfBoundsException("Please enter correct index ");

}

retrieveField2.setText( "" );

} // end anonymous inner class

} // end new ActionListener

); // end call to addActionListener

// set up output Panel

outputArea = new JPanel();

outputArea.add( new JLabel( "Result" ) );

outputField = new JTextField( 30 );

outputField.setEditable( false );

outputArea.add( outputField );

add( inputArea );

add( retrieveArea );

add( outputArea );

} // end constructor

} // end class ArrayAccess

// ArrayAccessTest.java import javax.swing.JFrame; public class ArrayAccessTest { // execute application public static void main( String args[] ) { ArrayAccess application = new ArrayAccess(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); application.setSize( 400, 200 ); application.setVisible( true ); } } // end class ArrayAccessTest

// NumberNotFoundException.java public class NumberNotFoundException extends Exception { // no-argument constructor specifies default error message public NumberNotFoundException() { super( "Number not found in array" ); } // constructor to allow customized error message public NumberNotFoundException( String message ) { super( message ); } } // end class NumberNotFoundException