Thread: JComboBox with scroll bars.

Hello,

I have to make a graphical application, which has a JComboBox and scroll bars. I tried quite a few things, nothing worked and I don't know why. Here is the code I currently have.

package Java24;
 
import java.awt.*;
import javax.swing.*;
 
public class HR16ComboScroll extends JFrame{
	//Hour sixteen, activity one.	
 
 
	public HR16ComboScroll(){
		super("Combo Scroll");
		setSize(400,600);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		
		FlowLayout flo = new FlowLayout();
		setLayout(flo);
 
		String[] contents = new String[]{"Alem", "Habtam", "Desta", "Almaz", 
				"Zewdit", "Abraham", "Tsehaye"};
		JScrollBar pane = new JScrollBar();
		JComboBox list = new JComboBox(contents);
		list.addItem(pane);
		add(list);
 
		setVisible(true);
	}
 
	//run
	public static void main(String[] args){
		HR16ComboScroll pane = new HR16ComboScroll();
	}
}

I moved your post to the Swing forum - perhaps get more attention there. And ++ for the SSCCE.

I'm not sure what you mean when you say "which has a JComboBox and scroll bars". How do you want these components organized?

Originally Posted by copeg

And ++ for the SSCCE.

Sorry not sure what you mean.

Originally Posted by copeg

I'm not sure what you mean when you say "which has a JComboBox and scroll bars". How do you want these components organized?

Quote from book: "Create a GUI that includes a combo box in a scroll pane.".

Edit:
It does compile but the list doesn't have scroll bars, rather a long string, I don't know what the string means though(looks kinda like an exception).

Updated code:

public class HR16ComboScroll extends JFrame{
 
	public HR16ComboScroll(){
		super("Combo Scroll");
		setSize(200,50);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		
		FlowLayout flo = new FlowLayout();
		setLayout(flo);
 
		String[] contents = new String[]{"Alem", "Habtam", "Desta", "Almaz", 
				"Zewdit", "Abraham", "Tsehaye"};		
		JComboBox list = new JComboBox(contents);
		JScrollPane pane = new JScrollPane(list,
                JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
		JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
		//list.addItem(pane);
		add(pane);
 
		setVisible(true);
	}
 
	//run
	public static void main(String[] args){
		HR16ComboScroll pane = new HR16ComboScroll();
	}
}

The drop down list currently has the names in the contents array only. Problem: scroll bars should be within the combo box; not the other way around.

Sorry not sure what you mean.

Just a thanks for the short, self contained, complable example (sscce).

JComboBox by default already has a JScrollPane capability within the popup window. You can use the method setMaximumRowCount() to set the number of rows displayed you wish to display - the rest are viewable by scrolling