import java.awt.FlowLayout; import java.awt.GridLayout; import java.awt.event.Ac
ID: 3534663 • Letter: I
Question
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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[ 10 ];
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 )
{
/* Create a try block in which the application reads the number
entered in the inputField and assigns it to the next index
in the array, then increments instance variable index. */
/* Write catch handlers that catch the two types of exceptions
that the previous try block might throw (NumberFormatException
and ArrayIndexOutOfBoundsException), and display appropriate
messages in error message dialogs. */
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 )
{
/* Create a try block in which the application reads from
retrieveField1 the number the user wants to find in the
array, then searches the current array contents for the number.
If the number is found, the outputField should display all the
indices in which the number was found. If the number is not
found, a NumberNotFoundException should be thrown. */
/* Write catch handlers that catch the two types of exceptions that
the try block might throw (NumberFormatException and
NumberNotFoundException), and display appropriate messages
in error message dialogs. */
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 )
{
/* Create a try block in which the application reads from
retrieveField2 the index of a value in the array, then
displays the value at that index in the outputField. If the index
input by the user is not a number a NumberFormatException should
be thrown. If the number input by the user is outside the array
bounds or represents an element in which the application has not
stored a value, an ArrayIndexOutOfBoundsException should
be thrown. */
/* Write catch handlers that catch the two types of exceptions
the try block might throw (NumberFormatException and
ArrayIndexOutOfBoundsException), and display appropriate
messages in error message dialogs. */
retrieveField2.setText( "" );
} // end anonymous inner class
} // end new ActionListener
); // end call to addActionListener
Explanation / Answer
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