ConsoleCalculator.java

import java.awt.*;
import java.awt.event.*;



public class CalculatorApplication implements ActionListener
{
	
	int c,n;
	String s1,s2,s3,s4,s5;
	Frame f;
	Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,badd,bsub,bmul,bdiv,beq,bclr;
	
	Panel p;
	TextField t1;
	GridLayout g;
	
	
	    CalculatorApplication()
	    {
		f=new Frame(" My Calculator");
		f.setLayout(new FlowLayout());
		p=new Panel();
		
		
		b0=new Button("0");
		b0.addActionListener(this);
		
		b1=new Button("1");
		b1.addActionListener(this);
		
		b2=new Button("2");
		b2.addActionListener(this);
		
		b3=new Button("3");
		b3.addActionListener(this);
		
		b4=new Button("4");
		b4.addActionListener(this);
		
		b5=new Button("5");
		b5.addActionListener(this);
		
		b6=new Button("6");
		b6.addActionListener(this);
		
		b7=new Button("7");
		b7.addActionListener(this);
		
		b8=new Button("8");
		b8.addActionListener(this);
		
		b9=new Button("9");
		b9.addActionListener(this);
		
		badd=new Button("+");
		badd.addActionListener(this);
		
		bsub=new Button("-");
		bsub.addActionListener(this);
		
		bmul=new Button("*");
		bmul.addActionListener(this);
		
		bdiv=new Button("/");
		bdiv.addActionListener(this);
		
		beq=new Button("=");
		beq.addActionListener(this);
		
		bclr=new Button("CLR");
		bclr.addActionListener(this);
		
		t1=new TextField(20);
		f.add(t1);
		
		g=new GridLayout(4,4);
		p.setLayout(g);
		
		
		p.add(b0);
		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(badd);
		p.add(bsub);
		p.add(bmul);
		p.add(bdiv);
		p.add(beq);
		p.add(bclr);
		
		f.add(p);
		f.setSize(400,700);
		f.setVisible(true);
		f.setBackground(Color.LIGHT_GRAY);
		f.setBounds(50,340,260,60);
		f.addWindowListener(new WindowAdapter() {
			@Override
		     public void windowClosing(WindowEvent e){
		System.exit(0);	
		}
		});
	    }


	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		if(e.getSource()==b0) 
		{
			s3=t1.getText();
			s4="0";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		
		else if(e.getSource()==b1)
		{
			s3=t1.getText();
			s4="1";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		else if(e.getSource()==b2) 
		{
			s3=t1.getText();
			s4="2";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		
		else if(e.getSource()==b3) 
		{
			s3=t1.getText();
			s4="3";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		
		else if(e.getSource()==b4) 
		{
			s3=t1.getText();
			s4="4";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		else if(e.getSource()==b5) 
		{
			s3=t1.getText();
			s4="5";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		else if(e.getSource()==b6) 
		{
			s3=t1.getText();
			s4="6";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		else if(e.getSource()==b7) 
		{
			s3=t1.getText();
			s4="7";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		else if(e.getSource()==b8) 
		{
			s3=t1.getText();
			s4="8";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		else if(e.getSource()==b9) 
		{
			s3=t1.getText();
			s4="9";
			s5=s3+s4;
			t1.setText(s5);
			
			
		}
		
		else if(e.getSource()==badd) 
		{
			s1=t1.getText();
			t1.setText("");
			c=1;
			
			
		}
		
		

		else if(e.getSource()==bsub) 
		{
			s1=t1.getText();
			t1.setText("");
			c=2;
			
			
		}
		

		else if(e.getSource()==bmul) 
		{
			s1=t1.getText();
			t1.setText("");
			c=3;
			
			
		}
		

		else if(e.getSource()==bdiv) 
		{
			s1=t1.getText();
			t1.setText("");
			c=4;
			
			
		}
		

		else if(e.getSource()==beq) 
		{
			s2=t1.getText();
			if(c==1) 
			{
				n=Integer.parseInt(s1) + Integer.parseInt(s2);
				t1.setText(String.valueOf(n));
			}
			
			else if(c==2) 
			{
				n=Integer.parseInt(s1) - Integer.parseInt(s2);
				t1.setText(String.valueOf(n));
			}
			
			else if(c==3) 
			{
				n=Integer.parseInt(s1) * Integer.parseInt(s2);
				t1.setText(String.valueOf(n));
			}
			
			else if(c==4) 
			{
				n=Integer.parseInt(s1) / Integer.parseInt(s2);
				t1.setText(String.valueOf(n));
			}
			
			
		}
		
		if(e.getSource()==bclr) 
		{
			t1.setText("");
			
		}
		
	}
		public static void main(String[] args) 
		{
			
		CalculatorApplication c=new  CalculatorApplication();
		
		}
}