calculator in java with actionListener and KeyListener

//Calculator.java
import java.awt.*;
import java.awt.event.*;
class CalculatorDemo extends Frame implements ActionListener,KeyListener 
{
Panel p1,p2;
Label lblR;
Button btn7,btn8,btn9,btnA,btn4,btn5,btn6,btnS,btn1,btn2,btn3,btnM,btn0,btnC,btnE,btnD;
double x=0.0,y=0.0,z=0.0;
int op=0;
public CalculatorDemo()
{
super("Calculator Demo");
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
}
);
setSize(300,500);
setResizable(false);
setBounds((1366/2)-(300/2),(768/2)-(500/2),300,500);
p1=new Panel();
p2=new Panel();
p1.setFont(new Font("Serif",Font.PLAIN,50));
p2.setFont(new Font("Serif",Font.BOLD,30));
lblR=new Label("0",Label.RIGHT);
btn7=new Button("7");
btn8=new Button("8");
btn9=new Button("9");
btnA=new Button("+");
btn4=new Button("4");
btn5=new Button("5");
btn6=new Button("6");
btnS=new Button("-");
btn1=new Button("1");
btn2=new Button("2");
btn3=new Button("3");
btnM=new Button("*");
btn0=new Button("0");
btnC=new Button("C");
btnE=new Button("=");
btnD=new Button("/");
p1.setLayout(new BorderLayout());
p2.setLayout(new GridLayout(4,4));
p1.add(lblR,BorderLayout.NORTH);
p2.add(btn7);
p2.add(btn8);
p2.add(btn9);
p2.add(btnA);
p2.add(btn4);
p2.add(btn5);
p2.add(btn6);
p2.add(btnS);
p2.add(btn1);
p2.add(btn2);
p2.add(btn3);
p2.add(btnM);
p2.add(btn0);
p2.add(btnC);
p2.add(btnE);
p2.add(btnD);
setLayout(new BorderLayout());
add(p1,BorderLayout.NORTH);
add(p2,BorderLayout.CENTER);
btn7.addKeyListener(this);
btn8.addKeyListener(this);
btn9.addKeyListener(this);
btnA.addKeyListener(this);
btn4.addKeyListener(this);
btn5.addKeyListener(this);
btn6.addKeyListener(this);
btnS.addKeyListener(this);
btn1.addKeyListener(this);
btn2.addKeyListener(this);
btn3.addKeyListener(this);
btnM.addKeyListener(this);
btn0.addKeyListener(this);
btnC.addKeyListener(this);
btnE.addKeyListener(this);
btnD.addKeyListener(this);
btn7.addActionListener(this);
btn8.addActionListener(this);
btn9.addActionListener(this);
btnA.addActionListener(this);
btn4.addActionListener(this);
btn5.addActionListener(this);
btn6.addActionListener(this);
btnS.addActionListener(this);
btn1.addActionListener(this);
btn2.addActionListener(this);
btn3.addActionListener(this);
btnM.addActionListener(this);
btn0.addActionListener(this);
btnC.addActionListener(this);
btnE.addActionListener(this);
btnD.addActionListener(this);

setVisible(true);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==btn7)
{
x=Double.valueOf(lblR.getText());
x=x*10+7;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn8)
{
x=Double.valueOf(lblR.getText());
x=x*10+8;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn9)
{
x=Double.valueOf(lblR.getText());
x=x*10+9;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn4)
{
x=Double.valueOf(lblR.getText());
x=x*10+4;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn5)
{
x=Double.valueOf(lblR.getText());
x=x*10+5;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn6)
{
x=Double.valueOf(lblR.getText());
x=x*10+6;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn3)
{
x=Double.valueOf(lblR.getText());
x=x*10+3;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn2)
{
x=Double.valueOf(lblR.getText());
x=x*10+2;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn1)
{
x=Double.valueOf(lblR.getText());
x=x*10+1;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btn0)
{
x=Double.valueOf(lblR.getText());
x=x*10+0;
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btnC)
{
x=Double.valueOf(lblR.getText());
x=Math.floor(x/10);
lblR.setText(String.valueOf(x));
}
if(ae.getSource()==btnA)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=1;
}
if(ae.getSource()==btnS)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=2;
}
if(ae.getSource()==btnM)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=3;
}
if(ae.getSource()==btnD)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=4;
}
if(ae.getSource()==btnE)
{
if(op==1)
{
z=y+x;
lblR.setText(String.valueOf(z));
x=z;
}
if(op==2)
{
z=y-x;
lblR.setText(String.valueOf(z));
x=z;
}
if(op==3)
{
z=y*x;
lblR.setText(String.valueOf(z));
x=z;
}
if(op==4)
{
z=y/x;
lblR.setText(String.valueOf(z));
x=z;
}
}
}
public void keyTyped(KeyEvent e) {           
}
public void keyPressed(KeyEvent e)
{
int c=e.getKeyChar();
int gen = Character.getNumericValue(c);

System.out.println(c);
if(gen==Integer.parseInt(btn7.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+7;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn8.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+8;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn9.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+9;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn4.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+4;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn5.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+5;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn6.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+6;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn3.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+3;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn2.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+2;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn1.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+1;
lblR.setText(String.valueOf(x));
}
if(gen==Integer.parseInt(btn0.getLabel()))
{
x=Double.valueOf(lblR.getText());
x=x*10+0;
lblR.setText(String.valueOf(x));
}
if(c==99)
{
x=Double.valueOf(lblR.getText());
x=0;
lblR.setText(String.valueOf(x));
}
if(c==43)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=1;
}
if(c==45)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=2;
}
if(c==42)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=3;
}
if(c==47)
{
y=x;
x=0.0;
lblR.setText(String.valueOf(x));
op=4;
}
if(e.getKeyCode() == KeyEvent.VK_ENTER)
{
if(op==1)
{
z=y+x;
lblR.setText(String.valueOf(z));
x=z;
}
if(op==2)
{
z=y-x;
lblR.setText(String.valueOf(z));
x=z;
}
if(op==3)
{
z=y*x;
lblR.setText(String.valueOf(z));
x=z;
}
if(op==4)
{
z=y/x;
lblR.setText(String.valueOf(z));
x=z;
}
}
}
public void keyReleased(KeyEvent e) {            
}   
}
class Calculator
{
public static void main(String[] args)
{
new CalculatorDemo();
}
}

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