Need to be done in Java using swing and awt. This program needs to create a GUI

Question

Need to be done in Java using swing and awt. This program needs to create a GUI that generates random passwords for the user. The program should consist of the following swing components:

1 JButton to create a password,

4 JRadio buttons to allow the user to select the size of the password in characters (8 characters, 16, 24, and 32 characters.)

3 JCheckBoxes to allow the user to select the level of complexity for the password ("Use Caps", "Use Special Characters", "Use Numbers")

1 JTextField to display the created password.

When the Create Password button is clicked by the user, the program should generate a password of random characters with a length of equal to the value chosen by the radio buttons. The password should consist only of lower case characters(a-z) unless the user has checked the various checkboxes to make the password more complex by include capital letters, numbers, or special characters($!@#%&).

Finally if the password has been generated and the user attempts to close the window, prevent the window from closing and display a dialog box to remind the user to securely record their new password somewhere.

Explanation / Answer

package chegg;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JButton;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.util.Random;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
import javax.swing.JCheckBox;
import javax.swing.JTextField;

public class Sample {

   private JFrame frame;
   private JTextField textField;

   /**
   * Launch the application.
   */
   public static void main(String[] args) {
       EventQueue.invokeLater(new Runnable() {
           public void run() {
               try {
                   Sample window = new Sample();
                   window.frame.setVisible(true);
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       });
   }

   /**
   * Create the application.
   */
   public Sample() {
       initialize();
   }

   /**
   * Initialize the contents of the frame.
   */
   private void initialize() {
       frame = new JFrame();
       frame.setBounds(100, 100, 450, 300);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.getContentPane().setLayout(null);
      
       JLabel lblSelectSize = new JLabel("Select Size");
       lblSelectSize.setBounds(23, 34, 80, 23);
       frame.getContentPane().add(lblSelectSize);
      
       JRadioButton rdbtnNewRadioButton = new JRadioButton("8");
       rdbtnNewRadioButton.setBounds(109, 34, 36, 23);
       frame.getContentPane().add(rdbtnNewRadioButton);
      
       JRadioButton radioButton = new JRadioButton("16");
       radioButton.setBounds(148, 34, 44, 23);
       frame.getContentPane().add(radioButton);
      
       JRadioButton radioButton_1 = new JRadioButton("24");
       radioButton_1.setBounds(192, 34, 49, 23);
       frame.getContentPane().add(radioButton_1);
      
       JRadioButton radioButton_2 = new JRadioButton("32");
       radioButton_2.setBounds(244, 34, 109, 23);
       frame.getContentPane().add(radioButton_2);
      
       JLabel lblLevelOfComplexity = new JLabel("Level of Complexity");
       lblLevelOfComplexity.setBounds(23, 80, 122, 14);
       frame.getContentPane().add(lblLevelOfComplexity);
      
       JCheckBox chckbxUppercase = new JCheckBox("Use Case");
       chckbxUppercase.setBounds(148, 76, 95, 23);
       frame.getContentPane().add(chckbxUppercase);
      
       JCheckBox chckbxUseSpecialCharacters = new JCheckBox("Use Special Characters");
       chckbxUseSpecialCharacters.setBounds(256, 76, 172, 23);
       frame.getContentPane().add(chckbxUseSpecialCharacters);
      
       JCheckBox chckbxUseNumbers = new JCheckBox("Use Numbers");
       chckbxUseNumbers.setBounds(148, 109, 97, 23);
       frame.getContentPane().add(chckbxUseNumbers);
      
       textField = new JTextField();
       textField.setBounds(71, 151, 249, 20);
       frame.getContentPane().add(textField);
       textField.setColumns(10);
      
       JButton btnNewButton = new JButton("Create Password");
       btnNewButton.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent arg0) {
               int size = 0;
               if(rdbtnNewRadioButton.isSelected())
                   size = 8;
               else if(radioButton.isSelected())
                   size = 16;
               else if(radioButton_1.isSelected())
                   size = 24;
               else if(radioButton_2.isSelected())
                   size = 32;
              
               String small_case = "abcdefghijklmnopqrstuvwxyz";
               String upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
               String numbers = "0123456789";
               String symbols = "$!@#%&";
               StringBuilder sb = new StringBuilder(64);
              
               sb.append(small_case.toCharArray());
               if(chckbxUppercase.isSelected())
                   sb.append(upper_case.toCharArray());
               if(chckbxUseSpecialCharacters.isSelected())
                   sb.append(symbols.toCharArray());
               if(chckbxUseNumbers.isSelected())
                   sb.append(numbers.toCharArray());
               char result[] = sb.toString().toCharArray();
              
               String password = "";
               for(int i = 0; i < size;i++)
               {
                   int rnd = new Random().nextInt(result.length);
                   password = password + result[rnd];
               }
               textField.setText(password);
           }
       });
       btnNewButton.setBounds(127, 195, 136, 23);
       frame.getContentPane().add(btnNewButton);
       frame.addWindowListener(new java.awt.event.WindowAdapter() {
       public void windowClosing(java.awt.event.WindowEvent windowEvent) {
       if (JOptionPane.showConfirmDialog(frame,
       "Please save your password", "Really Closing?",
       JOptionPane.YES_NO_OPTION,
       JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION){
       System.exit(0);
       }
       }
       });  
   }  
}

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