Java Sample Pro

Java Calculator Program

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();
}
}

Simple Calculator Example Program

javax.swing.* and java.awt.* etc..

import java.awt.EventQueue;

import java.awt.GridLayout;

import java.awt.BorderLayout;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.JButton;

import java.awt.Container;

          public class SimpleCalc implements ActionListener

          {

    JFrame guiFrame;

    JPanel buttonPanel;

    JTextField numberCalc;

    int calcOperation = 0;

    int currentCalc;

              public static void main(String[] args) 

              {

          EventQueue.invokeLater(new Runnable())

         {

             public void run()

             {

                 new SimpleCalc();         

             }

         });

    }

    public SimpleCalc()

    {

        guiFrame = new JFrame();

        guiFrame.setDefaultCloseOperation(JFrame.Exit_On_Close);

        guiFrame.setTitle("Simple Calculator");

        guiFrame.setSize(300,300);

        guiFrame.setLocationRelativeTo(null);

        numberCalc = new JTextField();

        numberCalc.setHorizontalAlignment(JTextField.Right);

        numberCalc.setEditable(false);

        guiFrame.add(numberCalc, BorderLayout.North);

        buttonPanel = new JPanel();

        buttonPanel.setLayout(new GridLayout(4,3));   

        guiFrame.add(buttonPanel, BorderLayout.Center);

        for (int i=1;i<10 i="" span="">

        {

            addButton(buttonPanel, String.valueOf(i));

        }

                 JButton addButton = new JButton("+");

        addButton.setActionCommand("+");

        OperatorAction subAction = new OperatorAction(1);

        addButton.addActionListener(subAction);

        JButton subButton = new JButton("-");

        subButton.setActionCommand("-");

        OperatorAction addAction = new OperatorAction(2);

        subButton.addActionListener(addAction);

        JButton equalsButton = new JButton("=");

        equalsButton.setActionCommand("=");

        equalsButton.addActionListener(new ActionListener()

        {

         public void actionPerformed(ActionEvent event)

        {

                if (!numberCalc.getText().isEmpty())

                {

                    int number = Integer.parseInt(numberCalc.getText()); 

                    if (calcOperation == 1)

                    {

                        int calculate = currentCalc  + number;

                        numberCalc.setText(Integer.toString(calculate));

                    }

                    else if (calcOperation == 2)

                    {

                        int calculate = currentCalc  - number;

                        numberCalc.setText(Integer.toString(calculate));

                    }

                }

            }

        });

        buttonPanel.add(addButton);

        buttonPanel.add(subButton);

        buttonPanel.add(equalsButton);

        guiFrame.setVisible(true);  

    }

     private void addButton(Container parent, String name)

    {

        JButton but = new JButton(name);

        but.setActionCommand(name);

        but.addActionListener(this);

        parent.add(but);

     } 

     public void actionPerformed(ActionEvent event)

    {

         String action = event.getActionCommand();

        numberCalc.setText(action);       

     }

     private class OperatorAction implements ActionListener

     {

        private int operator;

      public OperatorAction(int operation)

     {

            operator = operation;

      }

      public void actionPerformed(ActionEvent event)

      {

            currentCalc = Integer.parseInt(numberCalc.getText()); 

            calcOperation = operator;

        }

    }

}