Question

modify the code below to create a GUI program that accepts a String from the user in a TextField and reports whether or not there are repeated characters in it. Thus your program is a client of the class which you created in question 1 above.


N.B. most of the modification needs to occur in the constructor and the actionPerformed() methods. So you should spend time working out exactly what these two methods are doing, so that you can make the necessary modifications.

Q1 CODE: (do not modify this one)

public class QuestionOne {
// main funtion
public static void main(String []args) {
Scanner sc = new Scanner(System.in);
// get user input string
System.out.println("Enter a String: ");
String s = sc.nextLine();
// calling the static function and store it to a variable
boolean repeatChar = repeatCharacter(s);
// if the result of the static function is true
if(repeatChar){
// print has repeated characters
System.out.println("String has repeated characters");
}
else {
// if not display no repeated characters
System.out.println("String does not have repeated characters");
}
}
// static function that accepts string as parameter
public static boolean repeatCharacter(String s){
char ch;
//check if repeated character available or not
for(int i=0; i < s.length(); ++i) {
ch = s.charAt(i);
//check if the index and the last index of the character is same or not
if(s.indexOf(ch) != s.lastIndexOf(ch)) {   
return true;
}
}
// no character repetition return false
return false;
}

CODE TO MODIFY THE GUI: (Please modify this one)

//SimplApp.java - a simple example of a GUI program

//You should be able to give a brief description of what

//such a program will do and the steps involved

import javax.swing.*; //for JFrame, JButton, JLabel

import java.awt.*; //for Container, BorderLayout

import java.awt.event.*; //for WindowAdapter,

ActionListner, ActionEvent

public class SimplApp extends JFrame {

// define window's width and height in pixels

private static final int WIDTH = 400;

private static final int HEIGHT = 200;

// used for displaying text in the window

private JLabel infoLabel;

private class ButtonAction implements

ActionListener {

public void actionPerformed(ActionEvent e){

infoLabel.setText("You fool !!");

} //end of actionPerformed

} //end of class ButtonAction

// used to destroy/close the window

private class WindowDestroyer extends

WindowAdapter {

public void windowClosing(WindowEvent e){

dispose();

System.exit(0);

} //end of windowClosing()

} //end of class WindowDestroyer

// Below is the constructor for the class SimplApp

public SimplApp(String windowTitle) {

super(windowTitle);

setSize(WIDTH, HEIGHT);

// create content pane to add components to

window

Container c1 = getContentPane();

c1.setLayout( new BorderLayout());

// create a label component with the String

centred

infoLabel = new JLabel( "Initial",

JLabel.CENTER);

c1.add( infoLabel, BorderLayout.CENTER);

// create a button component

JButton button1=new JButton("Don't Press

Me!");

c1.add( button1, BorderLayout.NORTH);

//goes at top

// add an action event to button

ButtonAction myAction = new ButtonAction();

button1.addActionListener(myAction);

// add action event to window close button

WindowDestroyer myListener = new

WindowDestroyer();

addWindowListener( myListener);

} //end of SimplApp constructor

public static void main(String[] args) {

// calls constructor

SimplApp app = new SimplApp("Zzzz");

// display window on the screen

app.setVisible(true);

System.out.println("Finished

SimplApp.main()");

} //end of SimplApp.main()

} //end of SimplApp class

Thanks, anyone/expert answer person!

}

Answer 1

Code

import javax.swing.*; //for JFrame, JButton, JLabel
import java.awt.*; //for Container, BorderLayout
import java.awt.event.*; //for WindowAdapter,ActionListner, ActionEvent
public class SimplApp extends JFrame
{
// define window's width and height in pixels
private static final int WIDTH = 400;
private static final int HEIGHT = 200;
// used for displaying text in the window
private JLabel infoLabel;
private JTextField inputText;
private class ButtonAction implements
ActionListener {
public void actionPerformed(ActionEvent e){
String str=inputText.getText();
if(repeatCharacter(str))
infoLabel.setText("String has repeated characters");
else
infoLabel.setText("String does not have repeated characters.");
} //end of actionPerformed
} //end of class ButtonAction
// used to destroy/close the window
public boolean repeatCharacter(String s)
{
char ch;
//check if repeated character available or not
for(int i=0; i < s.length(); ++i) {
ch = s.charAt(i);
//check if the index and the last index of the character is same or not
if(s.indexOf(ch) != s.lastIndexOf(ch)) {   
return true;
}
}
return false;
}

private class WindowDestroyer extends WindowAdapter {
public void windowClosing(WindowEvent e){
dispose();
System.exit(0);
} //end of windowClosing()
} //end of class WindowDestroyer
// Below is the constructor for the class SimplApp
public SimplApp(String windowTitle)
{
super(windowTitle);
setSize(WIDTH, HEIGHT);
// create content pane to add components to window
Container c1 = getContentPane();
c1.setLayout( new BorderLayout());
inputText=new JTextField();
c1.add(inputText,BorderLayout.NORTH);
// create a label component with the String centred   
infoLabel = new JLabel( "Initial",JLabel.CENTER);
c1.add( infoLabel, BorderLayout.SOUTH);
// create a button component
JButton button1=new JButton("Don't Press Me!");
c1.add( button1, BorderLayout.CENTER);
  

//goes at top
// add an action event to button
ButtonAction myAction = new ButtonAction();
button1.addActionListener(myAction);
// add action event to window close button
WindowDestroyer myListener = new
WindowDestroyer();
addWindowListener( myListener);
} //end of SimplApp constructor
  
public static void main(String[] args) {
// calls constructor
SimplApp app = new SimplApp("Check String Contain Repeated Characters");
// display window on the screen
app.setVisible(true);
System.out.println("Finished SimplApp.main()");
} //end of SimplApp.main()
} //end of SimplApp class

output

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