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listen for button event

1 reply on 1 page. Most recent reply: Mar 11, 2005 12:33 AM by Matthias Neumair

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Geoff Tait

Posts: 1
Nickname: dogbody
Registered: Mar, 2005

listen for button event

Posted: Mar 10, 2005 8:57 PM

I'm trying to get information entered in a gui to be available from the parent class used to show the gui.

I've made up a bare bones example. I have one parent class and one child gui class. The gui has one textbox and one button.

I want the line System.out.println(gc.getTextValue()); to be executed in SomeClass when the button on the gui is pressed.


package test;
public class SomeClass{
 
    public static void main(String[] args) {
        GuiClass1 gc = new GuiClass1();
        gc.setVisible(true);
        System.out.println(gc.getTextValue());
    }
}

Here's the code for the gui


package test;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JButton;
 
public class GuiClass1 extends JFrame {
 
	private javax.swing.JPanel jContentPane = null;
	private JTextField jTextField = null;
	private JButton jButton = null;
	private String value = "";
  	
	public String getTextValue() {
	    return value;
	}
	
	private JTextField getJTextField() {
		if (jTextField == null) {
			jTextField = new JTextField();
			jTextField.setBounds(71, 54, 126, 23);
		}
		return jTextField;
	}
 
	private JButton getJButton() {
		if (jButton == null) {
			jButton = new JButton();
			jButton.setBounds(86, 91, 88, 17);
			jButton.setText("ok");
 
			jButton.addActionListener(new java.awt.event.ActionListener() { 
				public void actionPerformed(java.awt.event.ActionEvent e) {    
					value = jTextField.getText();
				}
			});
		}
		return jButton;
	}
 
	public GuiClass1() {
		initialize();
	}
 
	private void initialize() {
		this.setSize(300,200);
		this.setContentPane(getJContentPane());
		this.setTitle("JFrame");
	}
 
	private javax.swing.JPanel getJContentPane() {
		if(jContentPane == null) {
			jContentPane = new javax.swing.JPanel();
			jContentPane.setLayout(null);
			jContentPane.add(getJTextField(), null);
			jContentPane.add(getJButton(), null);
		}
		return jContentPane;
	}
}

Thanks for your help
GT

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: listen for button event

Posted: Mar 11, 2005 12:33 AM

What's the problem?

Just add the line to the actionlistener.

			jButton.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					value = jTextField.getText();
					System.out.println(this.getTextValue()); //or System.out.println(value);
				}
			});

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