our professor gave us a template and here it is: import java.awt.BorderLayout; i

Question

our professor gave us a template and here it is:

import java.awt.BorderLayout;
import java.awt.GridLayout;

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

import javax.swing.JPanel;
import javax.swing.JTextField;

public class Lab14 extends JFrame {

public Lab14() {
  
  // TODO Set the title of the Frame to CS251 Calculator
  // TODO set the size of the Frame to 600 x 600
  // TODO Make the Frame non-resizable
  // TODO place the frame in the middle of the screen
  // TODO Terminate the program, if we click on the close button of the titlebar.
  
  createComponents();
  // TODO set the frame to visible
}

public void createComponents() {

  JPanel numKeysPanel = new JPanel(/* TODO set the layout to a grid layout 4x3*/);
  JPanel operationKeysPanel = new JPanel(/*TODO set the layout to a grid layout 2x2*/);
  
  
  JButton num1 = new JButton("1");
  JButton num2 = new JButton("2");
  JButton num3 = new JButton("3");
  JButton num4 = new JButton("4");
  JButton num5 = new JButton("5");
  JButton num6 = new JButton("6");
  JButton num7 = new JButton("7");
  JButton num8 = new JButton("8");
  JButton num9 = new JButton("9");
  JLabel emptyCell1 = new JLabel("");
  JLabel emptyCell2 = new JLabel("");
  JButton decimalPoint = new JButton(".");

  // TODO Add num1, num2,....decimalPoint to the numKeysPanel panel

  // TODO Create four JButtons with + - * /
  // TODO Add the JButtons you have created to the operationKeysPanel panel

     //TODO Add numKeysPanel to the center region of the JFrame
  //TODO Add operationKeysPanel to the East region of the JFrame
  
  //TODO Create a JTextField object with text "0" and make the JTextField disabled
  //TODO add the JTextField object to the North region of the JFrame

}

public static void main(String[]args){
new Lab14();
}

In this lab, you will be creating a GUI for a simple calculator. Please download lab14.java from D2L and implement the application by following the TODO comments Your GUI should look like the below screen-shot. CS251 Calculator

Explanation / Answer

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package lab14;
import java.awt.BorderLayout;
import java.awt.GridLayout;

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

import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Dimension;

/**
*
* @author sivaram
*/
public class Lab14 extends JFrame
{
    public static void main(String[] args)
{
        new Lab14();
       
    }

public Lab14() {
JFrame jframe = new JFrame("CS251 Calculator");// TODO Set the title of the Frame to CS251 Calculator
jframe.setPreferredSize(new Dimension(600,600)); // TODO set the size of the Frame to 600 x 600
jframe.setResizable(false); // TODO Make the Frame non-resizable
jframe.setLocationRelativeTo(null); // TODO place the frame in the middle of the screen
/*Sets the location of the window relative to the specified component. If the component is not currently showing, or c (the Component) is null, the window is centered on the screen.*/
jframe.setDefaultCloseOperation(EXIT_ON_CLOSE); // TODO Terminate the program, if we click on the close button of the titlebar.
createComponents();

}

public void createComponents() {

JPanel numKeysPanel = new JPanel();
       numKeysPanel.setLayout(new GridLayout(4,3));/* TODO set the layout to a grid layout 4x3*/
JPanel operationKeysPanel = new JPanel();
operationKeysPanel.setLayout(new GridLayout(2,2));/*TODO set the layout to a grid layout 2x2*/


JButton num1 = new JButton("1");
JButton num2 = new JButton("2");
JButton num3 = new JButton("3");
JButton num4 = new JButton("4");
JButton num5 = new JButton("5");
JButton num6 = new JButton("6");
JButton num7 = new JButton("7");
JButton num8 = new JButton("8");
JButton num9 = new JButton("9");
JLabel emptyCell1 = new JLabel("");
JLabel emptyCell2 = new JLabel("");
JButton decimalPoint = new JButton(".");
numKeysPanel.add(num1);
numKeysPanel.add(num2);
numKeysPanel.add(num3);
numKeysPanel.add(num4);
numKeysPanel.add(num5);
numKeysPanel.add(num6);
numKeysPanel.add(num7);
numKeysPanel.add(num8);
numKeysPanel.add(num9);
numKeysPanel.add(emptyCell1);
numKeysPanel.add(emptyCell2);
numKeysPanel.add(decimalPoint);
JButton plus = new JButton("+");
JButton minus= new JButton("-");
JButton mul = new JButton("*");
JButton div = new JButton("/");// TODO Create four JButtons with + - * /

operationKeysPanel.add(plus);
operationKeysPanel.add(minus);
operationKeysPanel.add(mul);
operationKeysPanel.add(div); // TODO Add the JButtons you have created to the operationKeysPanel panel

JTextField zero = new JTextField("0");
zero.setEnabled(false);
zero.setText("Disabled");//TODO Create a JTextField object with text "0" and make the JTextField disabled

}

}

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