Getting Action event for JButtons
Question
Hi i am trying to get the action event for my jbuttons, but when i try the e.get source method for the second button i get and error saying it cant find the symbol myButton2 which is public. I think that it may be a problem with the e.getSource method but i'm not sure.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JTextField;
import javax.swing.JPanel;
class Keypad {
public static void main(String[] args) {
new MyApplication();
}
}
class MyApplication extends JFrame implements ActionListener {
// CLASS INSTANCES AND OBJECTS
public MyApplication() {
setLayout(null);
JPanel panel1 = new JPanel();
add(panel1);
JTextArea text1 = new JTextArea(2, 12);
panel1.add(text1);
panel1.setBounds(0, 130, 370, 40);
Font textFont1 = new Font("Arial Bold", Font.BOLD, 18);
JButton myButton = new JButton("1");
myButton.setBounds(20, 190, 60, 60);
JButton myButton1 = new JButton("<html><center> 2 <br /> ABC </center> </html>");
myButton1.setBounds(85, 190, 60, 60);
myButton1.addActionListener(this);
JButton myButton2 = new JButton("<html><center> 3 <br /> DEF </center> </html>");
myButton2.setBounds(150, 190, 60, 60);
JButton myButton3 = new JButton("<html><center> 4 <br /> GHI </center> </html>");
myButton3.setBounds(20, 260, 60, 60);
JButton myButton4 = new JButton("<html><center> 5 <br /> JKL </center> </html>");
myButton4.setBounds(85, 260, 60, 60);
JButton myButton5 = new JButton("<html><center> 6 <br /> MNO </center> </html>");
myButton5.setBounds(150, 260, 60, 60);
JButton myButton6 = new JButton("<html><center> 7 <br /> PQRS </center> </html>");
myButton6.setBounds(20, 330, 60, 60);
JButton myButton7 = new JButton("<html><center> 8 <br /> TUV </center> </html>");
myButton7.setBounds(85, 330, 60, 60);
JButton myButton8 = new JButton("<html><center> 9 <br /> WXYZ </center> </html>");
myButton8.setBounds(150, 330, 60, 60);
JButton myButton9 = new JButton("*");
myButton9.setBounds(20, 400, 60, 60);
JButton myButton10 = new JButton("0");
myButton10.setBounds(85, 400, 60, 60);
JButton myButton11 = new JButton("#");
myButton11.setBounds(150, 400, 60, 60);
add(myButton);
add(myButton1);
add(myButton2);
add(myButton3);
add(myButton4);
add(myButton5);
add(myButton6);
add(myButton7);
add(myButton8);
add(myButton9);
add(myButton10);
add(myButton11);
setTitle("Keypad");
setSize(300, 500);
setLocation(250, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
Object src = e.getSource();
if(e.getSource() == myButton2){
// EVENT HANDLING !!!!!
}
}
}
And also, would i be able to create a method which act when the button is clicked a number of times ie 2 or 3 times like a keypad.
Thanks
1 answers
solution1
3 ACCPTED 2015-11-30 15:56:53
You were declaring the buttons inside the class's constructor , which means that they are not visible outside of it. So you need to declare your buttons as member variables , so that they would be accessible to all of the class's methods:
class myApplication extends JFrame implements ActionListener {
JButton myButton1;
JButton myButton2;
JButton myButton3;
...
myApplication() {
myButton1 = new JButton("<html><center> 2 <br /> ABC </center> </html>");
...
myButton2 = new JButton("<html><center> 3 <br /> DEF </center> </html>");
...
}
public void actionPerformed(ActionEvent e) { ... }
}
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