Add scrollbar to JFrame

Source code below will show you, how to add scrollbar to a JFrame.

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COMPLETE SOURCE CODE FOR : AddScrollBarToJFrame.java
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import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class AddScrollBarToJFrame
{
public static void main(String[]args)
{
//Create a JPanel
JPanel panel=new JPanel();

//Create a scrollbar using JScrollPane and add panel into it's viewport
//Set vertical and horizontal scrollbar always show
JScrollPane scrollBar=new JScrollPane(panel,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

//Create a JFrame with title ( AddScrollBarToJFrame )
JFrame frame=new JFrame("AddScrollBarToJFrame");

//Add JScrollPane into JFrame
frame.add(scrollBar);

//Set close operation for JFrame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//Set JFrame size
frame.setSize(400,400);

//Make JFrame visible. So we can see it.
frame.setVisible(true);

//So, if you want to add other component like JTextArea, just add them into JPanel.After that add
//the JPanel into JScrollPane before add the JScrollPane into JFrame.
}
}

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JUST COMPILE AND EXECUTE IT
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