_10.calculator.java

import javax.swing.*;
import java.awt.event.*;
class Calculator extends JFrame implements ActionListener{
private JTextField t1;
private JButton b1;
private JButton b2;
private JButton b3;
private JButton b4;
private JButton b5;
private JButton b6;
private JButton b7;
private JButton b8;
private JButton b9;
private JButton b10;
private JButton b11;
private JButton b12;
private JButton b13;
private JButton b14;
private JButton b15;
private JButton b16;
private Integer res;
private String operation;
public Calculator(){
setLayout(null);
setSize(640,480);
t1 = new JTextField();
t1.setBounds(100,100,200,30);
b1 = new JButton("1");
b1.setBounds(100,140,50,30);
b2 = new JButton("2");
b2.setBounds(150,140,50,30);
b3 = new JButton("3");
b3.setBounds(200,140,50,30);
b4 = new JButton("+");
b4.setBounds(250,140,50,30);
// Third Row
b5 = new JButton("4");
b5.setBounds(100,170,50,30);
b6 = new JButton("5");
b6.setBounds(150,170,50,30);
b7 = new JButton("6");
b7.setBounds(200,170,50,30);
b8 = new JButton("-");
b8.setBounds(250,170,50,30);
// Fourth Row
b9 = new JButton("7");
b9.setBounds(100,200,50,30);
b10 = new JButton("8");
b10.setBounds(150,200,50,30);
b11 = new JButton("9");
b11.setBounds(200,200,50,30);
b12 = new JButton("*");
b12.setBounds(250,200,50,30);
// Fourth Row
b13 = new JButton("/");
b13.setBounds(100,230,50,30);
b14 = new JButton("%");
b14.setBounds(150,230,50,30);
b15 = new JButton("=");
b15.setBounds(200,230,50,30);
b16 = new JButton("C");
b16.setBounds(250,230,50,30);
add(t1);add(b1);add(b2);
add(b3);add(b4);add(b5);
add(b6);add(b7);add(b8);
add(b9);add(b10);add(b11);
add(b12);add(b13);add(b14);
add(b15);add(b16);
b1.addActionListener(this);b2.addActionListener(this);
b3.addActionListener(this);b4.addActionListener(this);
b5.addActionListener(this);b6.addActionListener(this);
b7.addActionListener(this);b8.addActionListener(this);
b9.addActionListener(this);b10.addActionListener(this);
b11.addActionListener(this);b12.addActionListener(this);
b13.addActionListener(this);b14.addActionListener(this);
b15.addActionListener(this);b16.addActionListener(this);
}
public void doAction(String op){
if(operation == null){
operation = op;
res = Integer.parseInt(t1.getText());
t1.setText("");
}
else{
switch(operation){
case "+": res = res + Integer.parseInt(t1.getText());
break;
case "-": res = res - Integer.parseInt(t1.getText());
break;
case "/": try{
if(t1.getText().equals("0")){
throw new
ArithmeticException("Divide by Zero");
}
res = res / Integer.parseInt(t1.getText());
}
 catch(ArithmeticException e){
t1.setText(e.getMessage());
operation = null;
res = 0;
 }
 break;
case "*": res = res * Integer.parseInt(t1.getText());
break;
case "%": res = res % Integer.parseInt(t1.getText());
break;
}
if(op.equals("=")){
t1.setText(res.toString());
res = 0;
operation = null;
}
else{
operation = op;
t1.setText("");
}
}
}
public void actionPerformed(ActionEvent e){
if(e.getSource()== b1)
t1.setText(t1.getText()+"1");
else if(e.getSource()== b2)
t1.setText(t1.getText()+"2");
else if(e.getSource()== b3)
t1.setText(t1.getText()+"3");
else if(e.getSource()== b5)
t1.setText(t1.getText()+"4");
else if(e.getSource()== b6)
t1.setText(t1.getText()+"5");
else if(e.getSource()== b7)
t1.setText(t1.getText()+"6");
else if(e.getSource()== b9)
t1.setText(t1.getText()+"7");
else if(e.getSource()== b10)
t1.setText(t1.getText()+"8");
else if(e.getSource()== b11)
t1.setText(t1.getText()+"9");
else if(e.getSource()== b16){
t1.setText("");
res =0;
operation = null;
}
else if(e.getSource()== b4){
doAction("+");
}
else if(e.getSource()== b8)
doAction("-");
else if(e.getSource()== b12)
doAction("*");
else if(e.getSource()== b13)
doAction("/");
else if(e.getSource()== b14)
doAction("%");
else if(e.getSource()== b15)
doAction("=");
}
public static void main(String args[]){
new Calculator().setVisible(true);
}}