1. Write a Java application to display the following GUI. At this point you are

Question

1. Write a Java application to display the following GUI. At this point you are only implementing the display. We are not ready to make the calculator actually do any calculation

This program has the following requirements

1. The size of the calculator is 250 x 250 pixels.

2. The background and foreground color of the calculator buttons must alternate in a checker board pattern as shown above. You can choose any pair of colors for your foreground and background colors.

3. The buttons should have at least 5 pixels of space between them.

4. The text on the buttons should be SanSerif size 16 and be bold.

5. Your application should be implemented in a single class. The main method of the class does nothing more than create an object of the class. The constructor of the class creates and displays the GUI. The constructor may call other methods of the class if needed.

6. The class must inherit from JFrame as the following demonstrates:

public myGUI extends JFrame {

Explanation / Answer

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class Calculator implements ActionListener
{
int c,n;
String s1,s2,s3,s4,s5;
Frame f;
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
Panel p;
TextField tf1;
GridLayout gl;
Calculator()
{
f=new Frame("Calculator");
p=new Panel();
b1=new JButton("0");
b1.addActionListener(this);
b2=new JButton("1");
b2.addActionListener(this);
b3=new JButton("2");
b3.addActionListener(this);
b4=new JButton("3");
b4.addActionListener(this);
b5=new JButton("4");
b5.addActionListener(this);
b6=new JButton("5");
b6.addActionListener(this);
b7=new JButton("6");
b7.addActionListener(this);
b8=new JButton("7");
b8.addActionListener(this);
b9=new JButton("8");
b9.addActionListener(this);
b10=new JButton("9");
b10.addActionListener(this);
b11=new JButton("+");
b11.addActionListener(this);
b12=new JButton("-");
b12.addActionListener(this);
b13=new JButton("x");
b13.addActionListener(this);
b14=new JButton("/");
b14.addActionListener(this);
b15=new JButton("=");
b15.addActionListener(this);
b16=new JButton("A/C");
b16.addActionListener(this);
tf1=new TextField(20);
p.add(tf1);
tf1.setBackground(Color.yellow);
gl=new GridLayout(4,4,10,20);
p.setLayout(gl);
p.add(b1);p.add(b2);p.add(b3);p.add(b4);p.add(b5);p.add(b6);p.add(b7);p.add(b8);p.add(b9);p.add(b10);p.add(b11);p.add(b12);p.add(b13);p.add(b14);p.add(b15);p.add(b16);
f.add(p);
f.setSize(100,200);
f.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
{
s3=tf1.getText();
s4="0";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b2)
{
s3=tf1.getText();
s4="1";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b3)
{
s3=tf1.getText();
s4="2";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b4)
{
s3=tf1.getText();
s4="3";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b5)
{
s3=tf1.getText();
s4="4";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b6)
{
s3=tf1.getText();
s4="5";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b7)
{
s3=tf1.getText();
s4="6";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b8)
{
s3=tf1.getText();
s4="7";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b9)
{
s3=tf1.getText();
s4="8";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b10)
{
s3=tf1.getText();
s4="9";
s5=s3+s4;
tf1.setText(s5);
}
if(e.getSource()==b11)
{
s1=tf1.getText();
tf1.setText("");
c=1;
}
if(e.getSource()==b12)
{
s1=tf1.getText();
tf1.setText("");
c=2;
}
if(e.getSource()==b13)
{
s1=tf1.getText();
tf1.setText("");
c=3;
}
if(e.getSource()==b14)
{
s1=tf1.getText();
tf1.setText("");
c=4;
}
if(e.getSource()==b15)
{
s2=tf1.getText();
if(c==1)
{
n=Integer.parseInt(s1)+Integer.parseInt(s2);
tf1.setText(String.valueOf(n));
}
else
if(c==2)
{
n=Integer.parseInt(s1)-Integer.parseInt(s2);
tf1.setText(String.valueOf(n));
}
else
if(c==3)
{
n=Integer.parseInt(s1)*Integer.parseInt(s2);
tf1.setText(String.valueOf(n));
}
else
if(c==4)
{
n=Integer.parseInt(s1)/Integer.parseInt(s2);
tf1.setText(String.valueOf(n));
}
}
if(e.getSource()==b16)
{
tf1.setText("");
}
}
public static void main(String args[])
{
Calculator c=new Calculator();
}
}

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