How can I effect to another class? (for example: to click the checkbox)

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Hi, how can I click the checkbox in another class. Could you please help me? Thanks.

This code in class2.java. No error but no effect, too.

Java

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
      class1 click=new class1();
      click.jCheckBox1.setSelected(true);  // jCheckBox1 in class1.java
   }

Posted 10-Jan-16 23:15pm

bugsoul

Updated 11-Jan-16 3:26am

v3

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Comments

Sergey Alexandrovich Kryukov 11-Jan-16 10:19am

There are classes (types) and instances. You need to understand it, to start with. "To another class" is nonsense.
—SA

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Richard MacCutchan · Answer 1 · 2016-01-11T04:18:00

It should really crash your app. You create a new instance of class1, try to click a checkbox in it which you have not yet created, then leave this method, at which time this object gets deleted. You need to select the checkbox that exists on the screen, and in your original object, that you (presumably) created at the beginning of your program.

Roland 57 · Answer 2 · 2016-01-11T12:47:00

Solution 2

The problem is: class1 is not fully instantiated yet.
You should use Swingutilities.invokelater(...).

Posted 11-Jan-16 12:47pm

Roland 57

Comments

bugsoul 12-Jan-16 4:31am

Thanks Roland, but I can't understand. Could you please give an example or link abouth this.

Roland 57 12-Jan-16 9:44am

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
final class1 click = new class1();
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
click.jCheckBox1.setSelected(true);
}
}
);
}

bugsoul 12-Jan-16 10:37am

I try exactly, but nothing happen,again.

Roland 57 · Answer 3 · 2016-01-12T05:05:00

Java

package test;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;

/**
 *
 * @author Roland
 */
public class Test {
    
    private static class A extends JFrame {
        {
            JButton b = new JButton("click");
            add(b);
            pack();
            b.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    B f = new B();
                    f.cb.setSelected(true);
                }
            });
            setDefaultCloseOperation(EXIT_ON_CLOSE);
        }
    };
    
    private static class B extends JFrame {
        public JCheckBox cb = new JCheckBox("Hallo");
    
        {
            add(cb);
            pack();
            setVisible(true);
        }
    };
    
    public static void main(String[] args) {
        new A().setVisible(true);
    }
    
}

How can I effect to another class? (for example: to click the checkbox)

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