How to register array of button and identify in actionPerfomed method.

Code :

import java.awt.*;
import java.awt.event.*;
class Bt implements ActionListener{
	Frame f;
	Button b[]=new Button[3];
	Button b1[]=new Button[3];
	Button b2[]=new Button[3];
	TextField tf;
 
	Bt(String s){
		Frame f=new Frame(s);
		TextField tf=new TextField();
		for(int i=0;i<b.length;i++){
			b[i]=new Button();
			b[i].setLabel(String.valueOf(i));
			b[i].setBounds((60*i),250,30,30);
 
			//b[i].addActionListener(this); 
			f.add(b[i]);
		}
		//for(int d=0;d<b.length;d++){
			//b[d].addActionListener(this);
		//}
		tf.setBounds(20,60,100,100);
		f.add(tf);
		f.setLayout(null);
		f.setSize(400,400);
		f.setVisible(true);
	}
	public void actionPerformed(ActionEvent k){
 
		/*for(int i=0;i<b.length;i++){
 
			if(k.getSource()==b[i]){
 
				switch(i){
				case 0:tf.setText("Welcome"); //how can i check which button is generated event.
				case 1:tf.setText("Let's play");
				case 2:tf.setText("Quit");
					//break;
				}
 
			}
		}*/
 
		}
	public static void main(String... arg){
		new Bt("ButtonType");
	}
 
}

how can i check which button is generated event? I want if Button 1 is pressed then it show Welcome in texfield, if button 2 then it show let's play. how can i achieve it?