/*
 * This program illustrates how to find which button among many is pressed.
 * 
 * */

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class ManyButtons implements ActionListener{
    
    private  int buttonCount=12;
    JButton []  buttons=new JButton[buttonCount]; // Button array
    JButton exit=new JButton("Exit"); // To exit from this app.
    
    private void createButtons(){
        // Create buttons and add an actionListener to each. Label does not matter other than for aesthetics.
        for (int i=0; i<buttons.length; i++){
            buttons[i]=new JButton(Integer.toString(i));
            buttons[i].addActionListener(this);
        }
        exit.addActionListener(this);
    }
    
    public ManyButtons(JFrame f){
      
       this.buttonCount=buttonCount;
        // Create a panel and add all buttons to it.
        JPanel p=new JPanel(new GridLayout(buttonCount/4, buttonCount/4));
        JPanel exitPanel=new JPanel ();
        createButtons();
        
        for (int i=0; i<buttons.length; i++){
            p.add(buttons[i]);
        }
        exitPanel.add(exit);
        f.setLayout(new GridLayout(2,1));
        f.setSize(300, 100);
        f.add(p);
        f.add(exitPanel);
        f.pack();
        f.setVisible(true);
      }
      // This actionPerformed is called when any button is pressed.
    public void actionPerformed(ActionEvent e){
        Object b=e.getSource(); // Get button pressed
        if(b==exit)System.exit(0);
        
        for(int i=0; i<buttonCount; i++){ // Which button is pressed?
            if(b==buttons[i]){
                System.out.println(i+" button pressed");
                return;
            }
        }
    }
      
      public static void main(String[] args){
          JFrame f=new JFrame("Many buttons test"); // Create frame and 
          new ManyButtons(f); // display it.
          
      }
      
   
        
}