Java – Swings

GUI:

• Java API is providing classes and interfaces to implement GUI programming.
• We were used Applets to implement GUI in early days.
• Applets run with HTML pages.
• Java code not run by JVM, applets run by browser interpreter.

javax.swing:

• Swing is an extended package to applets.
• Using swings, we can develop pure java based GUI applications.
• Swing applications run by JVM only.
• GUI is windows based.
• Object creation of swing.JFrame class results a window.

import javax.swing.JFrame;
class GUI 
{
	public static void main(String[] args) 
	{
		JFrame frame = new JFrame();
		frame.setVisible(true); 
	}
}

We can create Custom frame by extending the functionality of JFrame class.

import javax.swing.JFrame;
class MyFrame extends JFrame
{
	MyFrame()
	{
		this.setTitle("First Frame");
		this.setSize(400,300);
	}
}
class GUI 
{
	public static void main(String[] args) 
	{
		MyFrame frame = new MyFrame();
		frame.setVisible(true); 
	}
}