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Calculator.java
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package guru;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
public class Calculator implements ActionListener{
JLabel displayLabel;
JFrame jf;
JButton Button7;
JButton Button8;
JButton Button9;
JButton Button4;
JButton Button5;
JButton Button6;
JButton Button1;
JButton Button2;
JButton Button3;
JButton Button0;
JButton Buttoneq;
JButton Buttondot , Buttonpls, Buttonmult, Buttonmns, Buttondiv, Buttonclr;
public Calculator() {
jf = new JFrame("Calculator");
jf.setLayout(null);
jf.setSize(600, 600);
jf.setLocation(370, 100);
displayLabel = new JLabel("0");
displayLabel.setBounds(30, 50, 540, 40);
displayLabel.setBackground(Color.LIGHT_GRAY);
displayLabel.setOpaque(true);
displayLabel.setHorizontalAlignment(SwingConstants.RIGHT);
jf.add(displayLabel);
Button7 = new JButton("7");
Button7.setBounds(30, 130 , 80 , 80);
Button7.addActionListener(this);
jf.add(Button7);
Button8 = new JButton("8");
Button8.setBounds(130, 130 , 80 , 80);
Button8.addActionListener(this);
jf.add(Button8);
Button9 = new JButton("9");
Button9.addActionListener(this);
Button9.setBounds(230, 130 , 80 , 80);
jf.add(Button9);
Button4 = new JButton("4");
Button4.addActionListener(this);
Button4.setBounds(30, 230 , 80 , 80);
jf.add(Button4);
Button5 = new JButton("5");
Button5.addActionListener(this);
Button5.setBounds(130, 230 , 80 , 80);
jf.add(Button5);
Button6 = new JButton("6");
Button6.addActionListener(this);
Button6.setBounds(230, 230 , 80 , 80);
jf.add(Button6);
Button3 = new JButton("3");
Button3.addActionListener(this);
Button3.setBounds(230, 330 , 80 , 80);
jf.add(Button3);
Button2 = new JButton("2");
Button2.addActionListener(this);
Button2.setBounds(130, 330 , 80 , 80);
jf.add(Button2);
Button1 = new JButton("1");
Button1.addActionListener(this);
Button1.setBounds(30, 330 , 80 , 80);
jf.add(Button1);
Buttoneq = new JButton("=");
Buttoneq.setBounds(230, 430 , 340 , 80);
Buttoneq.addActionListener(this);
jf.add(Buttoneq);
Buttondot = new JButton(".");
Buttondot.addActionListener(this);
Buttondot.setBounds(30, 430 , 80 , 80);
jf.add(Buttondot);
Button0 = new JButton("0");
Button0.addActionListener(this);
Button0.setBounds(130, 430 , 80 , 80);
jf.add(Button0);
Buttondiv= new JButton("/");
Buttondiv.setBounds(330, 130 , 80 , 80);
Buttondiv.addActionListener(this);
jf.add(Buttondiv);
Buttonmult= new JButton("X");
Buttonmult.addActionListener(this);
Buttonmult.setBounds(430, 130 , 80 , 80);
jf.add(Buttonmult);
Buttonpls = new JButton("+");
Buttonpls.addActionListener(this);
Buttonpls.setBounds(330, 230 , 182 , 80);
jf.add(Buttonpls);
Buttonmns = new JButton("-");
Buttonmns.addActionListener(this);
Buttonmns.setBounds(330, 330 , 182 , 80);
jf.add(Buttonmns);
Buttonclr= new JButton("clear");
Buttonclr.addActionListener(this);
Buttonclr.setBounds(520, 130 , 60 , 280);
jf.add(Buttonclr);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new Calculator();
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==Buttoneq) {jf.getContentPane().setBackground(Color.DARK_GRAY);
}
else if(e.getSource()!=Buttoneq){jf.getContentPane().setBackground(Color.white);}
if(e.getSource()==Button7) {
displayLabel.setText(displayLabel.getText()+"7");
}
else if(e.getSource()==Button8) {
displayLabel.setText(displayLabel.getText()+"8");
}
else if(e.getSource()==Button9) {
displayLabel.setText(displayLabel.getText()+"9");
}
else if(e.getSource()==Button6) {
displayLabel.setText(displayLabel.getText()+"6");
}
else if(e.getSource()==Button5) {
displayLabel.setText(displayLabel.getText()+"5");
}
else if(e.getSource()==Button4) {
displayLabel.setText(displayLabel.getText()+"4");
}
else if(e.getSource()==Button3) {
displayLabel.setText(displayLabel.getText()+"3");
}
else if(e.getSource()==Button2) {
displayLabel.setText(displayLabel.getText()+"2");
}
else if(e.getSource()==Button1) {
displayLabel.setText(displayLabel.getText()+"1");
}
else if(e.getSource()==Buttondot) {
displayLabel.setText(displayLabel.getText()+".");
}
else if(e.getSource()==Button0) {
displayLabel.setText(displayLabel.getText()+"0");
}
else if(e.getSource()==Buttonmns) {
displayLabel.setText(displayLabel.getText()+"-");
}
else if(e.getSource()==Buttonpls) {
displayLabel.setText(displayLabel.getText()+"+");
}
else if(e.getSource()==Buttondiv) {
displayLabel.setText(displayLabel.getText()+"/");
}
else if(e.getSource()==Buttonmult) {
displayLabel.setText(displayLabel.getText()+"*");
}
else if(e.getSource()==Buttonclr) {
displayLabel.setText("");
}
}
}