Create a java based GUI calculator as shown below ...
Implement only the following functionalities ...
Solution:
/*Java GUI based calculator.
* Written by Shaeed Khan
* Date-22 Oct 2013
* Version- 1.0
* */
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Calculator {
public static void main(String[] args){
final CalculatorShaeed cal = new CalculatorShaeed();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
//Calling the gui thread
cal.makeGUI();
}
});
}//End main
}
//Calculator class
class CalculatorShaeed extends JFrame{
//Variables
double x,y,result;
boolean first;
boolean second,ch;
char action;
JTextField screen;
//Constructor
public CalculatorShaeed() {
super("Simple Calculator - SHAEED");
x=0;
y=0;
result=0;
first=true;
second=true;
ch=false;
action='A';
}
//Method for GUI
public void makeGUI(){
//Configuring the GUI
setLayout(new FlowLayout());
setVisible(true);
setSize(320,220);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setResizable(false);
//Buttons
JButton b0 = new JButton("0");
JButton b1 = new JButton("1");
JButton b2 = new JButton("2");
JButton b3 = new JButton("3");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("7");
JButton b8 = new JButton("8");
JButton b9 = new JButton("9");
JButton bMul = new JButton("*");
JButton bDiv = new JButton("/");
JButton bPlus = new JButton("+");
JButton bMinus = new JButton("-");
JButton bPoint = new JButton(".");
JButton bEqual = new JButton("=");
JButton bPM = new JButton("+/-");
JButton bKSP = new JButton("BKSP");
JButton bCE = new JButton("CE");
JButton bCLR = new JButton("CLR");
//Screen
screen = new JTextField(10);
screen.setText("Shaeed-Cal");
screen.setHorizontalAlignment(JTextField.RIGHT);
screen.setFont(new Font("Arial", Font.PLAIN, 28));
JLabel scr = new JLabel();
scr.add(screen);
//Adding the keys to Keypad
JPanel key = new JPanel();
key.setLayout(new GridLayout(5,4));
key.add(bKSP);
key.add(bCE);
key.add(bCLR);
key.add(bPM);
key.add(b7);
key.add(b8);
key.add(b9);
key.add(bDiv);
key.add(b4);
key.add(b5);
key.add(b6);
key.add(bMul);
key.add(b1);
key.add(b2);
key.add(b3);
key.add(bMinus);
key.add(b0);
key.add(bPoint);
key.add(bEqual);
key.add(bPlus);
//Adding to the frame
scr.setVisible(true);
key.setVisible(true);
add(screen,BorderLayout.NORTH);
add(key,BorderLayout.CENTER);
//Screen handler
screen.addKeyListener(new KeyListener() {
public void keyTyped(KeyEvent event) {
event.consume();
}
public void keyPressed(KeyEvent arg0) {
}
public void keyReleased(KeyEvent arg0) {
}
});//End Screen handler
//Keypad handlers
//0 key
b0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"0");
}
else
screen.setText(screen.getText()+"0");
}
});//End 0 key
//1 key
b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"1");
}
else
screen.setText(screen.getText()+"1");
}
});//End 1 key
//2 key
b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"2");
}
else
screen.setText(screen.getText()+"2");
}
});//End 2 key
//3 key
b3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"3");
}
else
screen.setText(screen.getText()+"3");
}
});//End 3 key
//4 key
b4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"4");
}
else
screen.setText(screen.getText()+"4");
}
});//End 4 key
//5 key
b5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"5");
}
else
screen.setText(screen.getText()+"5");
}
});//End 5 key
//6 key
b6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"6");
}
else
screen.setText(screen.getText()+"6");
}
});//End 6 key
//7 key
b7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"7");
}
else
screen.setText(screen.getText()+"7");
}
});//End 7 key
//8 key
b8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"8");
}
else
screen.setText(screen.getText()+"8");
}
});//End 8 key
//9 key
b9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(first){
screen.setText(null);
first=false;
screen.setText(screen.getText()+"9");
}
else
screen.setText(screen.getText()+"9");
}
});//End 9 key
// . key
bPoint.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if ((screen.getText().contains("."))==false) {
if (first) {
screen.setText(null);
first = false;
screen.setText(screen.getText() + "0.");
}
else if (screen.getText().isEmpty()) {
screen.setText("0.");
}
else {
screen.setText(screen.getText() + ".");
}
}
}
});//End . key
//Plus key
bPlus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
first=true;
if(second==false)
calculate();
second=false;
action='+';
x=Double.parseDouble(screen.getText());
}
});//End plus key
//minus key
bMinus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
first=true;
if(second==false)
calculate();
second=false;
action='-';
x=Double.parseDouble(screen.getText());
}
});//End minus key
//Mul key
bMul.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
first=true;
if(second==false)
calculate();
second=false;
action='*';
x=Double.parseDouble(screen.getText());
}
});//End mul key
//Division key
bDiv.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
first=true;
if(second==false)
calculate();
second=false;
action='/';
x=Double.parseDouble(screen.getText());
}
});//End division key
//+/- key
bPM.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if ((screen.getText().contains("-"))==false && (screen.getText().contains("+"))==false) {
if (first) {
screen.setText(null);
first = false;
screen.setText("-"+screen.getText());
}
else if (screen.getText().isEmpty()) {
screen.setText("-");
}
else {
screen.setText("-"+screen.getText());
}
}
else if ((screen.getText().contains("+"))==true){
String temp=screen.getText().replace('+', '-');
screen.setText(temp);
}
else {
String temp=screen.getText().replace('-', '+');
screen.setText(temp);
}
}
});//End +/- key
//Equal key
bEqual.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
calculate();
}
});//End equal key
//Backspace key
bKSP.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s1,s2;
s2="";
s1=screen.getText();
for(int i=0;i<s1.length()-1;i++){
s2+=s1.charAt(i);
}
screen.setText(null);
screen.setText(s2);
}
});//End backspace key
//CLR key
bCLR.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
screen.setText(null);
}
});//End CLR key
//CE key
bCE.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
x=0;
y=0;
result=0;
first=true;
second=true;
ch=false;
action='A';
screen.setText(null);
screen.setText("Shaeed-Cal");
}
});//End CE key
}
//Calculating answers
void calculate(){
first=true;
if(second==true && ch==true){
}
else
y=Double.parseDouble(screen.getText());
switch (action) {
case '+':
result = x + y;
break;
case '-':
result = x - y;
break;
case '*':
result = x * y;
break;
case '/':
result = x / y;
break;
default:
result=y;
break;
}
screen.setText(String.valueOf((float)result));
if(second==false)
ch=true;
second=true;
x=Double.parseDouble(screen.getText());
}
}
No comments:
Post a Comment