Slip21. 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
textlabel,findlabel,replacelabel,occurrencelabel;
JTextArea text;
JTextField findText,replaceText,occurrenceText;
JButton find,replace,exit;
JPanel pan1,pan2;
int occurrences1=0;
public Slip21()
{
textlabel=new JLabel("Enter
Text:");
findlabel=new JLabel("Text to
Find:");
replacelabel=new JLabel("Text
to replace:");
occurrencelabel=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(textlabel);
pan1.add(text);
pan1.add(findlabel);
pan1.add(findText);
pan1.add(replacelabel);
pan1.add(replaceText);
pan1.add(occurrencelabel);
pan1.add(occurrenceText);
find=new JButton("Find");
replace=new
JButton("Replace");
exit=new JButton("Exit");
find.addActionListener(this);
replace.addActionListener(this);
exit.addActionListener(this);
pan2=new JPanel();
pan2.setLayout(new FlowLayout());
pan2.add(find);
pan2.add(replace);
pan2.add(exit);
Container c=getContentPane();
c.add(pan1,"Center");
c.add(pan2,"South");
setTitle("Find and
Replace:");
setSize(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String
args[])
{
new Slip21();
}
public void
actionPerformed(ActionEvent ae)
{
int occurrences=0;
JButton btn=(JButton)ae.getSource();
if(btn==find)
{
String s=text.getText();
f=findText.getText();
int i=0;
int len=s.length();
int cnt=0;
int j=0;
while(cnt<len)
{
i=s.indexOf(f,cnt);
if(i!=j && i>0)
{
occurrences++;
}
j=i;
cnt=cnt+1;
}
occurrenceText.setText(Integer.toString(occurrences));
}
if(btn==replace)
{
String mainText=text.getText();
String r=replaceText.getText();
String f=findText.getText();
mainText=mainText.replaceAll(f,r);
text.setText(mainText);
}
if(btn==exit)
{
System.exit(0);
}
}
}
