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The default getContentPane() method comes withi JFrame [message #1435070]

Wed, 01 October 2014 01:36

Jie Li

Messages: 1
Registered: October 2014

Junior Member

Hello, I am new to the WindowBuilder and I have been struggling with the default getContentPane() method comes with the JFrame.
I first create a class which extends the JFrame. Below is the code from the code view which is actually empty.

import  javax.swing.JFrame;
public class StringFrame extends JFrame {
	public StringFrame() {
		
	}

However, from the design view, there is a default getContentPane() method. See image below.
index.php/fa/19326/0/

I don't know where this getContentPane() method is coming from and I can't delete it (In code view, there is nothing as you can see above). This getContentPane() method prevents me from using my own panel. From example, I have created another class which extends JPanel. See code below

import javax.swing.JPanel;
import java.awt.Color;
import javax.swing.SpringLayout;
import javax.swing.JButton;

public class StringPanel extends JPanel {
	public StringPanel() {
		setBackground(new Color(204, 51, 255));
		SpringLayout springLayout = new SpringLayout();
		setLayout(springLayout);
		
		JButton btnNewButton = new JButton("New button");
		springLayout.putConstraint(SpringLayout.NORTH, btnNewButton, 138, SpringLayout.NORTH, this);
		springLayout.putConstraint(SpringLayout.WEST, btnNewButton, 180, SpringLayout.WEST, this);
		add(btnNewButton);
	}
}

Then I tried to use this panel in the frame I have created. See the code below.

import javax.swing.JFrame;

public class StringFrame extends JFrame {
	public StringFrame() {
		StringPanel currentPanel=new StringPanel();
		this.setContentPane(currentPanel); //I have also triedthis.getContentPane().add(currentPanel);
	}

}

However, from the design view, nothing happened.
index.php/fa/19327/0/