Please help with Actionlistener-Button

Please help me by fixing the actionlistener to the buttons. I want to display in textbox 1 when I press button 1, had no idea how to do that... please help!
Code :
import java.awt.*;
import java.awt.event.*;
public class MyPhone extends Frame{
    public static void main(String arg[]){
        new MyPhone();
    }
    public MyPhone(){
        super ("My Phone");
        setLayout(new BorderLayout());
        TextField text1=new TextField (10);
        add("Center",text1);
        Button btn1=new Button("OK");
        Button btn2=new Button("CANCEL");
        Button btn3=new Button("CALL");
        Button btn4=new Button("OFF");
        Button btn5=new Button("UP");
        Button btn6=new Button("DOWN");
        Button btn7=new Button("LEFT");
        Button btn8=new Button("RIGHT");
        Button btn9=new Button(".");
        Button btn10=new Button("7");
        Button btn11=new Button("8");
        Button btn12=new Button("9");
        Button btn13=new Button("4");
        Button btn14=new Button("5");
        Button btn15=new Button("6");
        Button btn16=new Button("1");
        Button btn17=new Button("2");
        Button btn18=new Button("3");
        Button btn19=new Button("*");
        Button btn20=new Button("0");
        Button btn21=new Button("#");
        Panel B1=new Panel();
        B1.setLayout(new GridLayout(1,2));
        B1.add(btn1);
        B1.add(btn2);
        Panel A1=new Panel();
        A1.setLayout(new GridLayout(2,1));
        A1.add(text1);    
        A1.add(B1);
        Panel B2=new Panel();
        B2.setLayout(new BorderLayout());
        B2.add("North",btn5);
        B2.add("South",btn6);
        B2.add("West",btn7);
        B2.add("East",btn8);
        B2.add("Center",btn9);
        Panel A2=new Panel();
        A2.setLayout(new BorderLayout());
        A2.add("West",btn3);
        A2.add("East",btn4);
        A2.add("Center",B2);
        Panel A3=new Panel();
        A3.setLayout(new GridLayout(4,3));
        A3.add(btn10);
        A3.add(btn11);
        A3.add(btn12);
        A3.add(btn13);
        A3.add(btn14);
        A3.add(btn15);
        A3.add(btn16);
        A3.add(btn17);
        A3.add(btn18);
        A3.add(btn19);
        A3.add(btn20);
        A3.add(btn21);
        add("North",A1);
        add("Center",A2);
        add("South",A3);
        resize(250,400);
        show();
        btn1.addActionListener(this);
        btn2.addActionListener(this);
        btn3.addActionListener(this);
        btn4.addActionListener(this);
        btn5.addActionListener(this);
        btn6.addActionListener(this);
        btn7.addActionListener(this);
        btn8.addActionListener(this);
        btn9.addActionListener(this);
        btn10.addActionListener(this);
        btn11.addActionListener(this);
        btn12.addActionListener(this);
        btn13.addActionListener(this);
        btn14.addActionListener(this);
        btn15.addActionListener(this);
        btn16.addActionListener(this);
        btn17.addActionListener(this);
        btn18.addActionListener(this);
        btn19.addActionListener(this);
        btn20.addActionListener(this);
        btn21.addActionListener(this);
    }    
}