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21) Write a Java program to design a screen using Swing that will create four TextFields. First for the text, second for what to find and third for replace. Display result in the fourth TextField. Display the count of total no. of replacements made. The button clear to clear the TextFields.


                        	

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;


public class Slip21 extends JFrame implements ActionListener

{

        JLabel ltext, lfind, lreplace, loccurance;

        JTextArea text;

        JTextField findText, replaceText, occurrenceText;

        JButton find, replace, clear;

        JPanel pan1,pan2;

        int occurrences=0,i=0;


        Slip21()

        {

         
                  ltext= new JLabel("Enter Text : ");

                  lfind = new JLabel("Text to Find : ");

           lreplace = new JLabel("Text to Replace : ");

                  loccurance = new JLabel("No.of Occurrences : ");



                text = new JTextArea(1,20);

                findText = new JTextField(20);

                replaceText = new JTextField(20);

                occurrenceText = new JTextField(20);


                pan1 = new JPanel();

                pan1.setLayout(new GridLayout(4,2));

                pan1.add(ltext);

                pan1.add(text);

                pan1.add(lfind);

                pan1.add(findText);

                pan1.add(lreplace);

                pan1.add(replaceText);

                pan1.add(loccurance);

                pan1.add(occurrenceText);


                find = new JButton("Find");

                replace = new JButton("Replace");

                clear= new JButton("Clear");


                find.addActionListener(this);

                replace.addActionListener(this);

                clear.addActionListener(this);


                pan2 = new JPanel();

                pan2.setLayout(new FlowLayout());

                pan2.add(find);

                pan2.add(replace);

                pan2.add(clear);


              
                add(pan1,"Center");

                add(pan2,"South");


                setTitle("Find And Replace");

                setSize(300, 200);

                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                setVisible(true);

        }


     
        public void actionPerformed(ActionEvent ae)

        {

              
                if(ae.getSource() == find)

                {

                       String s = text.getText();

                        String f = findText.getText();

                        i = s.indexOf(f);

                         if(i != -1)

                        { 
occurrences++;

                               occurrenceText.setText(Integer.toString(occurrences));

                                text.select(i,i+f.length());


                                text.requestFocus();

                       
                        }

                }

                if(ae.getSource() == replace)

                {

                        if(text.getSelectedText().length()!=0)

                        {

                                String r = replaceText.getText();

                                text.replaceSelection(r);

                        }

                }

                if(ae.getSource() == clear)

                {

                 text.setText("");

                 findText.setText("");

                 replaceText.setText("");

                 occurrenceText.setText("");

                }

         }
     

         public static void main(String[] args)

         {

            new Slip21();

         }

}

21) Write a Java program to design a screen using Swing that will create four TextFields. First for the text, second for what to find and third for replace. Display result in the fourth TextField. Display the count of total no. of replacements made. The button clear to clear the TextFields.

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