Answered: please someone teach me , based on the…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

please someone teach me , based on the code given , how i can make the program run like the photo 1 , what password i have to key-in the program and make it run.

(Main java file)

package P3Q4;

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

public class P3Q4 extends JFrame{

private JLabel jtaMessage=new JLabel();
private JLabel jtaText=new JLabel("Enter your password");
private JPasswordField jpfPassword = new JPasswordField();
private JButton jtnSubmit = new JButton("Submit");
private JLabel jtaEmpty = new JLabel("");

public P3Q4(){

JPanel passwordPanel= new JPanel(new GridLayout(2,2));
JPanel messagePanel= new JPanel(new FlowLayout(FlowLayout.LEFT,0,0));

messagePanel.setBackground(Color.WHITE);
jtaText.setFont(new Font("Arial",Font.BOLD,14));
jtnSubmit.setFont(new Font("Arial",Font.BOLD,14));
jtaMessage.setFont(new Font("Arial",Font.BOLD,14));

jtaMessage.setVerticalAlignment(JLabel.TOP);
jtaMessage.setPreferredSize(new Dimension(430,110));

passwordPanel.add(jtaText);
passwordPanel.add(jpfPassword);
passwordPanel.add(jtaEmpty);
passwordPanel.add(jtnSubmit);

messagePanel.add(jtaMessage);
add(passwordPanel,BorderLayout.CENTER);
add(messagePanel,BorderLayout.SOUTH);

jtnSubmit.addActionListener(new ButtonListener());

setResizable(false);
setTitle("Set Password");
setSize(400, 240);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
private class ButtonListener implements ActionListener {

@Override
public void actionPerformed(ActionEvent e) {

String inputStr = new String(jpfPassword.getPassword());
try{
Password pw = new Password(inputStr);
jtaMessage.setForeground(Color.BLUE);
jtaMessage.setText("<html>Congratulations! Your password is valid. <html/>");
}
catch(InvalidPasswordException ex){
jtaMessage.setForeground(Color.RED);
jtaMessage.setText(ex.getMessage());
jpfPassword.grabFocus();
}
}
}

public static void main(String[] args) {
new P3Q4();
}

}

(InvalidPasswordException)

package P3Q4;

public class InvalidPasswordException extends Exception{

public InvalidPasswordException(){
super("Invalid Password Exception");
}

public InvalidPasswordException(String errMsg){
super(errMsg);
}
}

(Password)

package P3Q4;

public class Password {

public Password (String passwordStr) throws InvalidPasswordException {
if (passwordStr== null ||passwordStr.equals("")) {
throw new InvalidPasswordException("<html>Invalid password: password cannot be null or an empty string therefore please key-in the correct password.</html>");
} else {
int countDigits=0,countLetters=0,total=0;

for(int i=0;i<passwordStr.length();i++){
char ch = passwordStr.charAt(i);
if (Character.isDigit(ch)){
countDigits++;
}
else if (Character.isLetter(ch))
countLetters++;
}
total = countDigits + countDigits ;

String errMsg = "<html>";
boolean errorState=false;
if (countDigits == 0){
errMsg += "Your password should have at least 1 digit.<br>";
errorState=true;
}
if (countLetters == 0){
errMsg += "Your password should have at least 1 letter.<br>";
errorState=true;
}
if (total<7){
errMsg += "Your password should have at least 7 alpha-numeric characters.<br>";
errorState=true;
}
if (errorState==true){
errMsg += "<html/>";
throw new InvalidPasswordException(errMsg);
}
}
}
}