Question

Simple java questions

Q2.java:

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class Q2 extends JFrame {

public static void createAndShowGUI() {

JFrame frame = new JFrame("Lab");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Font font = new Font("Sans-serif", Font.BOLD, 20);

JLabel label = new JLabel("Enter a word");

label.setFont(font);

JTextField textField = new JTextField(10);

textField.setFont(font);

JButton button = new JButton("Enter");

button.setFont(font);

Font font1 = new Font("Sans-serif", Font.BOLD, 30);

JCheckBox sansSerif = new JCheckBox("Sans-serif");

sansSerif.setFont(font1);

JCheckBox serif= new JCheckBox("Serif");

serif.setFont(font1);

Font font2 = new Font("Sans-serif", Font.ITALIC, 15);

JRadioButton radioButtonRed = new JRadioButton("Red");

radioButtonRed.setFont(font2);

JRadioButton radioButtonGreen = new

JRadioButton("Green"); radioButtonGreen.setFont(font2);

JRadioButton radioButtonBlue = new JRadioButton("Blue");

radioButtonBlue.setFont(font2);

JPanel p = new JPanel();

p.add(label);

p.add(textField);

p.add(button);

JPanel checkBoxPanel = new JPanel();

checkBoxPanel.setLayout(new GridBagLayout());

GridBagConstraints c1 = new GridBagConstraints();

c1.gridx = 0; c1.gridy = GridBagConstraints.RELATIVE; c1.anchor =

GridBagConstraints.WEST;

checkBoxPanel.add(sansSerif, c1);

checkBoxPanel.add(serif, c1);

p.add(checkBoxPanel);

JPanel radioButtonPanel = new JPanel();

radioButtonPanel.setLayout(new GridBagLayout());

GridBagConstraints c = new GridBagConstraints(); c.gridx

= 0; c.gridy = GridBagConstraints.RELATIVE; c.anchor =

GridBagConstraints.WEST;

radioButtonPanel.add(radioButtonRed, c);

radioButtonPanel.add(radioButtonGreen, c);

radioButtonPanel.add(radioButtonBlue, c);

p.add(radioButtonPanel);

JLabel label1 = new JLabel(); p.add(label1);

//ButtonGroup checkBoxes = //complete this

Q2: Download Q2.java from Canvas Font Application Enter a word Enter a word Enter Enter Sans-serif Red Sans-serif Red Green o GreenSerif Serif Bue Blue Multiple check boxes can be checked at the same time, but for this exercise we set our check boxes' behavior so that only one may be checked at a time. We do the same for the radio buttons. Complete the program. What should you use? You are only required to insert the missing code fragment into your lab report. Q4: Rewrite Q2 using any other layout managers instead of the FlowLayout (i.e. you can choose BoxLayout, GridLayout or BorderLayout etc). Insert a screenshot of your program into your lab report.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// Q2.java

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class Q2 extends JFrame {

      public static void createAndShowGUI() {

            JFrame frame = new JFrame("Lab");

            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            Font font = new Font("Sans-serif", Font.BOLD, 20);

            JLabel label = new JLabel("Enter a word");

            label.setFont(font);

            JTextField textField = new JTextField(10);

            textField.setFont(font);

            JButton button = new JButton("Enter");

            button.setFont(font);

            Font font1 = new Font("Sans-serif", Font.BOLD, 30);

            JCheckBox sansSerif = new JCheckBox("Sans-serif");

            sansSerif.setFont(font1);

            JCheckBox serif = new JCheckBox("Serif");

            serif.setFont(font1);

            Font font2 = new Font("Sans-serif", Font.ITALIC, 15);

            JRadioButton radioButtonRed = new JRadioButton("Red");

            radioButtonRed.setFont(font2);

            JRadioButton radioButtonGreen = new JRadioButton("Green");

            radioButtonGreen.setFont(font2);

            JRadioButton radioButtonBlue = new JRadioButton("Blue");

            radioButtonBlue.setFont(font2);

            JPanel p = new JPanel();

            p.add(label);

            p.add(textField);

            p.add(button);

            JPanel checkBoxPanel = new JPanel();

            checkBoxPanel.setLayout(new GridBagLayout());

            GridBagConstraints c1 = new GridBagConstraints();

            c1.gridx = 0;

            c1.gridy = GridBagConstraints.RELATIVE;

            c1.anchor = GridBagConstraints.WEST;

            checkBoxPanel.add(sansSerif, c1);

            checkBoxPanel.add(serif, c1);

            p.add(checkBoxPanel);

            JPanel radioButtonPanel = new JPanel();

            radioButtonPanel.setLayout(new GridBagLayout());

            GridBagConstraints c = new GridBagConstraints();

            c.gridx = 0;

            c.gridy = GridBagConstraints.RELATIVE;

            c.anchor = GridBagConstraints.WEST;

            radioButtonPanel.add(radioButtonRed, c);

            radioButtonPanel.add(radioButtonGreen, c);

            radioButtonPanel.add(radioButtonBlue, c);

            p.add(radioButtonPanel);

            JLabel label1 = new JLabel();

            p.add(label1);

           

            // creating a ButtonGroup

            ButtonGroup checkBoxes = new ButtonGroup();

            // adding both checkboxes to the group, so that only one can be

            // selected at a time

            checkBoxes.add(sansSerif);

            checkBoxes.add(serif);

            frame.add(p);

            frame.setSize(300, 300);

            frame.setVisible(true);

      }

      public static void main(String[] args) {

            createAndShowGUI();

      }

}

//Q4.java

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class Q4 extends JFrame {

      public static void createAndShowGUI() {

            JFrame frame = new JFrame("Lab");

            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            Font font = new Font("Sans-serif", Font.BOLD, 20);

            JLabel label = new JLabel("Enter a word");

            label.setFont(font);

            JTextField textField = new JTextField(10);

            textField.setFont(font);

            JButton button = new JButton("Enter");

            button.setFont(font);

            Font font1 = new Font("Sans-serif", Font.BOLD, 30);

            JCheckBox sansSerif = new JCheckBox("Sans-serif");

            sansSerif.setFont(font1);

            JCheckBox serif = new JCheckBox("Serif");

            serif.setFont(font1);

            Font font2 = new Font("Sans-serif", Font.ITALIC, 15);

            JRadioButton radioButtonRed = new JRadioButton("Red");

            radioButtonRed.setFont(font2);

            JRadioButton radioButtonGreen = new JRadioButton("Green");

            radioButtonGreen.setFont(font2);

            JRadioButton radioButtonBlue = new JRadioButton("Blue");

            radioButtonBlue.setFont(font2);

            JPanel p = new JPanel();

            p.add(label);

            p.add(textField);

            p.add(button);

            JPanel checkBoxPanel = new JPanel();

           

            // using a grid layout with any number of rows and 1 column

            checkBoxPanel.setLayout(new GridLayout(0, 1));

            checkBoxPanel.add(sansSerif);

            checkBoxPanel.add(serif);

            p.add(checkBoxPanel);

            JPanel radioButtonPanel = new JPanel();

           

            // using a grid layout with any number of rows and 1 column

            radioButtonPanel.setLayout(new GridLayout(0, 1));

            radioButtonPanel.add(radioButtonRed);

            radioButtonPanel.add(radioButtonGreen);

            radioButtonPanel.add(radioButtonBlue);

            p.add(radioButtonPanel);

            JLabel label1 = new JLabel();

            p.add(label1);

           

            // creating a ButtonGroup

            ButtonGroup checkBoxes = new ButtonGroup();

            // adding both checkboxes to the group, so that only one can be

            // selected at a time

            checkBoxes.add(sansSerif);

            checkBoxes.add(serif);

            // using a vertical BoxLayout as layout for panel p

            p.setLayout(new BoxLayout(p, BoxLayout.Y_AXIS));

            frame.add(p);

            frame.setSize(400, 350);

            frame.setVisible(true);

      }

      public static void main(String[] args) {

            createAndShowGUI();

      }

}

/*OUTPUT Q2*/

Lab Enter a word Enter Sans-serif Red Serif O Green O Blue

/*OUTPUT Q4*/

進」Lab Enter a word Enter Sans-serif Serif Red O Green Blue