public class NumberNotFoundException extends Exception {

    public NumberNotFoundException() {
        super("Number not found in array");
    }

    public NumberNotFoundException(String message) {
        super(message);
    }
}

public class DuplicateValueException extends Exception {

    public DuplicateValueException() {
        super("Duplicate number found in the array");
    }

    public DuplicateValueException(String message) {
        super(message);
    }
}

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 Homework6 extends JFrame {
    private JTextField numbersField;
    private JTextField getNumbers;
    private JTextField getNumbersPosition;
    private JTextField outputResults;
    private JPanel numbersIN;
    private JPanel numbersOUT;
    private JPanel results;
    private int array[] = new int[10];
    private int index=0;
    private boolean b = false;
    private int p=0;



    public Final() {
        super("Accessing Array values");
        setLayout(new FlowLayout());
        numbersIN = new JPanel();
        numbersIN.add(new JLabel("Enter array elements here"));
        numbersField = new JTextField(10);
        numbersIN.add(numbersField);
        numbersField.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {


                String tmp = numbersField.getText();
                char[] chars = tmp.toCharArray();
                int integerArray[] = new int[chars.length];

                try {
                    if (integerArray.length > 10) {
                        throw new ArrayIndexOutOfBoundsException("Array cannot be larger then 10. You have " + integerArray.length);
                    }
                    for (int i = 0; i < tmp.length(); i++) {
                        if (!Character.isLetter(chars[i])) {
                            array[i] = Integer.parseInt(chars[i] + "");
                            System.out.print(array[i] + " ");
                        } else {
                            throw new NumberFormatException("Only valid integers must be entered no letters. This character isnt allowed: " + chars[i]);
                        }
                    }
                    /*
                    boolean duplicates=false;
                    for (int j=0;j<array.length;j++)
                      for (int k=j+1;k<array.length;k++)
                        if (k!=j && array[k] == array[j])
                          duplicates=true;
                    if(duplicates==true)
                        throw new DuplicateValueException("Duplicate Value Detected, please enter unique numbers");
                    */
                } catch (NumberFormatException | ArrayIndexOutOfBoundsException ex) { //| DuplicateValueException ex) {
                    JOptionPane.showMessageDialog(getContentPane(), ex.getMessage());
                }
                numbersField.setText("");
            }
        });


        numbersOUT = new JPanel(new GridLayout(2, 2));
        numbersOUT.add(new JLabel("Enter number to retrieve"));
        getNumbers = new JTextField(10);
        numbersOUT.add(getNumbers);
        getNumbers.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {

                String tmp1 = getNumbers.getText();
                try {
                    int search = Integer.parseInt(tmp1);
                    for (p = 0; p < array.length; p++) {
                        System.out.print(array[p] + " ");
                        if(array[p]==search) {
                            b = true;
                            index = p;
                        }
                    }
                    if(b==true){
                        outputResults.setText(search + " was in the following fields of the array " + index);
                    } else {
                        throw new NumberNotFoundException("Your number was not found.");
                    }

                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(getContentPane(), "You can only search for integers.");

                } catch (NumberNotFoundException ex) {
                    JOptionPane.showMessageDialog(getContentPane(), ex.getMessage());
                }

                getNumbers.setText("");
            }
        });
        numbersOUT.add(new JLabel("Enter index to retrieve"));
        getNumbersPosition = new JTextField(10);
        numbersOUT.add(getNumbersPosition);
        getNumbersPosition.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {

                String tmp2 = getNumbersPosition.getText();
                try {
                    int search1 = Integer.parseInt(tmp2);
                    if (search1 < 10) {
                        outputResults.setText("The number " + array[search1] + " was found in location " + search1);
                    } else {
                        throw new ArrayIndexOutOfBoundsException("Array search cannot be larger then 9. You have " + search1);
                    }
                } catch (NumberFormatException e1) {
                    JOptionPane.showMessageDialog(getContentPane(), "Only valid integers must be entered, no letters.");

                } catch (ArrayIndexOutOfBoundsException e1) {
                    JOptionPane.showMessageDialog(getContentPane(), e1.getMessage());
                }

                getNumbersPosition.setText("");
            }
        });

        results = new JPanel();
        results.add(new JLabel("Result"));
        outputResults = new JTextField(30);
        outputResults.setEditable(false);
        results.add(outputResults);
        add(numbersIN);
        add(numbersOUT);
        add(results);
    }

}

import javax.swing.JFrame;

public class Homework6Test {
    public static void main(String args[]){
    HW test = new HW();
    test.setTitle("Homework 6 - Exceptions");
    test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    test.setSize(400, 200);
    test.setVisible(true);
    }
}