java swing component cannot be resolved

Question

I took the following code from a tutorial:

import javax.swing.*;
import java.util.Date;

public class SwingGUI {

    public static void main( String[] args          


        

Answer 1

I was also facing the same problem in eclipse IDE but after changing the jar file to jre7(Right-click project>>Buildpath>>Configure build path>> AddLibrary>>Jre System Library) the error has resolved, i don't know how it happens can some one explain it.