GUI PROGRAM USING SWING

Design a GUI form using swing with a text field, a text label for displaying the input message “Input any string”, and three buttons with caption “Check Palindrome”, “Reverse”, “Find Vowels”. Write a complete program for above scenario and for checking palindrome in first button, reverse it after clicking second button and extract the vowels from it after clicking third button.

*
  Q) Design a GUI form using swing with a text field, a text label for displaying the input message
    “Input any string”, and three buttons with caption “Check Palindrome”, “Reverse”, “Find Vowels”.
    Write a complete program for above scenario and for checking palindrome in first button, reverse
    it after clicking second button and extract the vowels from it after clicking third button. [2075]
 */
package Q04_PalindromeProgram;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Palindrome extends JFrame
{
    public static void main(String[] args)
    {
        Palindrome frame = new Palindrome();
        frame.setVisible(true);
    }
    public Palindrome()
    {
        setLayout(new GridLayout(4,1,10,20));


        JLabel inputLabel = new JLabel("Input any String: ");
        JTextField inputTextField = new JTextField(20);
        add(inputLabel);
        add(inputTextField);

        JLabel outputLabel = new JLabel("Output: ");
        JTextField outputTextField = new JTextField(20);
        add(outputLabel);
        add(outputTextField);
        outputTextField.setEditable(false);

        JButton checkPalindromeButton = new JButton("Check Palindrome");
        add(checkPalindromeButton);

        JButton reverseButton = new JButton("Reverse");
        add(reverseButton);

        JButton findVowelButton = new JButton("Find Vowel");
        add(findVowelButton);

        checkPalindromeButton.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                String copyUserInput="";
                String userInput = inputTextField.getText();
                int length = userInput.length();

                for (int i = length-1; i>=0; i-- )
                {
                    copyUserInput = copyUserInput + userInput.charAt(i);
                }
                if (copyUserInput.equalsIgnoreCase(userInput))
                {
                    outputTextField.setText("String is palindrome.");
                }
                else
                {
                    outputTextField.setText("String isn't a palindrome.");
                }
            }
        });
        reverseButton.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                String reverseUserInput="";
                String userInput = inputTextField.getText();
                int length = userInput.length();

                for (int i = length-1; i>=0; i-- )
                {
                    reverseUserInput = reverseUserInput + userInput.charAt(i);
                }

                    outputTextField.setText("Reverse String is: "+ reverseUserInput);
            }
        });

        findVowelButton.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                char[] vowel={'a','e','i','o','u','A','E','I','O','U'};


                String userInput = inputTextField.getText();
                int length = userInput.length();
                char[] extractedVowel= new char[length];
                String showVowel="";


                for (int i =0; i<=length-1; i++ )
                {
                    for (int j = 0; j<=vowel.length-1; j++)
                    {
                        if(userInput.charAt(i)== vowel[j])
                        {
                            extractedVowel[i] = userInput.charAt(i);
                            showVowel = showVowel + String.valueOf(extractedVowel[i]); //append the extractedVowel to string varaible so that it can be displayed at once in a textfield in the form of string.
                        }
                    }
                }
               outputTextField.setText("Vowels: "+showVowel);
            }
        });

        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
}