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Today I started learning Java GUI and tried to create a simple window on my Ubuntu. I am using jre7 for now. I wrote code exactly from tutorial because from experience there are stuff that doesn't work even if it's correctly typed onto my screen. So, now I used thenewboston's first tutorial with Java GUI. Typed all syntax correctly, classes seems fine, no errors. He got window that was expected - mine only got blank window with no title and no text.

Screenshot with that http://sc-cdn.scaleengine.net/i/07ad762a0450ac18e60bc0083a5018a6.png

Code in JFrames.java file:

import java.awt.FlowLayout; // importē plūstošo skatu / default layout
import javax.swing.JFrame; // dod iespēju piekļūt pamata logu struktūrai
import javax.swing.JLabel; // ļauj rakstīt tekstu logos
public class JFrames extends JFrame {
 private JLabel item1;
 
 public JFrames() {
 super("The Title Of The Program"); // parāda title bar ar tekstu
 setLayout(new FlowLayout());
 
 item1 = new JLabel("This is sentence with something");
 item1.setToolTipText("This is tooltip on hover");
 add(item1); // pievieno logam šo lietiņu
 }
}

Please, ignore latvian comments, that's just for my reference. So I want to know - why my window appears blank?