How to handle events in java

[Juan Gilberto]

como evitar el uso de if cuando estoy manejando muchos botones en un formulario

public void actionPerformed(ActionEvent e){

if(e.getSource()==btn1){
btn1.setText("X");

}

else if(e.getSource()==btn2){

btn2.setText("Y");

}

[Michael Dunn]

> como evitar el uso de if cuando estoy manejando muchos botones en un formulario

if you could translate this to english, a lot more people could possibly help you

[Juan Gilberto]

Michael Dunn wrote:> como evitar el uso de if cuando estoy manejando muchos botones en un formulario

if you could translate this to english, a lot more people could possibly help you

sorry no speak english . . .traduction google . . please wait . .i´m java student in institute

and avoid using if the event is generated when you press a button I'm making a game with 9 buttons for a year and I'm using if. . but leave many

public void actionPerformed(ActionEvent e){

if(e.getSource()==btn1){

btn1.setText("X");

}

else if(e.getSource()==btn2){

btn2.setText("X");

}


else if(e.getSource()==btn3){

btn3.setText("X");

}


else if(e.getSource()==btn4){

btn4.setText("X");

}


else if(e.getSource()==btn5){

btn5.setText("X");

}


else if(e.getSource()==btn6){

btn6.setText("X");

}

[Fred Hamilton]

Juan Gilberto wrote:

Michael Dunn wrote:> como evitar el uso de if cuando estoy manejando muchos botones en un formulario

if you could translate this to english, a lot more people could possibly help you

sorry no speak english . . .traduction google . . please wait . .i´m java student in institute

and avoid using if the event is generated when you press a button I'm making a game with 9 buttons for a year and I'm using if. . but leave many

public void actionPerformed(ActionEvent e){

if(e.getSource()==btn1){

btn1.setText("X");

}

else if(e.getSource()==btn2){

btn2.setText("X");

}


else if(e.getSource()==btn3){

btn3.setText("X");

}


else if(e.getSource()==btn4){

btn4.setText("X");

}


else if(e.getSource()==btn5){

btn5.setText("X");

}


else if(e.getSource()==btn6){

btn6.setText("X");

}

This will work

public void actionPerformed(ActionEvent e) {

	Object o = e.getSource();

	if( o == btn1 ) {
		btn1.setText("x");
		return;
	}

	if( o == btn2 ) {
		btn2.setText("y");
		return;
	}
}

esto funciona ( this works ---> google translate)


or if I understand your second post...

Object o = e.getSource();
((JButton) o).setText("x");

sets any button clicked to "x";

Same as Michael Dunn.

[Michael Dunn]

still not sure of the problem, but his will eliminate all your if's

    
public void actionPerformed(ActionEvent e){
  JButton btn = (JButton)e.getSource();
  btn.setText("X");
} 

[Juan Gilberto]

Michael Dunn wrote:still not sure of the problem, but his will eliminate all your if's

    
public void actionPerformed(ActionEvent e){
  JButton btn = (JButton)e.getSource();
  btn.setText("X");
} 

This method is generally applicable to all nine buttons or copy and paste q there several times. . The idea is to simplify algo parecido a esto . .

if person select a button
put an x or y to the button. . but when a button is in x, the other should be in and. . is to make a game Triqui

[Juan Gilberto]

Michael Dunn wrote:still not sure of the problem, but his will eliminate all your if's

    
public void actionPerformed(ActionEvent e){
  JButton btn = (JButton)e.getSource();
  btn.setText("X");
} 

This method is generally applicable to all nine buttons or copy and paste q there several times. . The idea is to simplify

[pete stein]

To simplify, use arrays. For instance,

import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Buttons extends JPanel {
  private JButton[][] buttons = new JButton[3][3];
  
  public Buttons() {
    setLayout(new GridLayout(3, 3));
    ButtonListener buttonListener = new ButtonListener();
    for (int i = 0; i < buttons.length; i++) {
      for (int j = 0; j < buttons[i].length; j++) {
        buttons[i][j] = new JButton();
        buttons[i][j].setPreferredSize(new Dimension(100, 100));
        buttons[i][j].addActionListener(buttonListener);
        add(buttons[i][j]);
      }
    }
    
  }
  
  private class ButtonListener implements ActionListener {
    private String lastText = "Y";
    public void actionPerformed(ActionEvent e) {
      JButton button = (JButton) e.getSource();
      String text = button.getText();
      if (text.isEmpty()) {
        if (lastText.equalsIgnoreCase("Y")) {
          button.setText("X");
          lastText = "X";
        } else {
          button.setText("Y");
          lastText = "Y";
        }
      }
    }
  }
  
  private static void createAndShowGUI() {
    JFrame frame = new JFrame("Buttons Application");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(new Buttons());
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });

  }
}

[Rob Spoor]

Can someone provide a translation of the subject? I can then change it.

[Iban Cardona]

Rob Prime wrote:Can someone provide a translation of the subject? I can then change it.

Subject: How to handle events in java

[Rob Spoor]

Thank you very much.