Getting error when running swing program

[saravanan rajendran]

hi, i new to swing please help me

this is code:

import javax.swing.JFrame;
import javax.swing.JLabel;

//import statements
//Check if window closes automatically. Otherwise add suitable code
public class HelloWorldFrame extends JFrame {

public static void main(String args[]) {
new HelloWorldFrame();
}
HelloWorldFrame() {
JLabel jlbHelloWorld = new JLabel("Hello World");
add(jlbHelloWorld);
this.setSize(100, 100);
// pack();
setVisible(true);
}
}

when i compiling

javac HelloWorldFrame.java

when i running
java HelloWorldFrame

Getting below error:

Exception in thread "main" java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:159)
at java.awt.Window.<init>(Window.java:407)
at java.awt.Frame.<init>(Frame.java:402)
at java.awt.Frame.<init>(Frame.java:367)
at javax.swing.JFrame.<init>(JFrame.java:163)
at HelloWorldFrame.<init>(HelloWorldFrame.java:11)
at HelloWorldFrame.main(HelloWorldFrame.java:9)

[Campbell Ritchie]

Please don't ask the same question twice.
I have already transferred you to the Linux forum because I don't think this is a Java problem at all.

[satishkumar janakiraman]

I dont think this exception is related to Linux. You have written a code which requires a display. But your environment does not support a display.
Check your environment has all of them