Components not showing

Hi.
I'm trying to add some components in several tabs, but they do not seem to be showing. I've tried to change around a lot of things and re-writing the whole thing, but I still can't get it to work.
It needs to be said that I'm writing Java as an hobby so I've not studied it, so you'd propably see many flaws.

Here's my sources:

core.java

Code:

---

import javax.swing.*;
import java.awt.*;

public class core {
        private JTabbedPane tab = new JTabbedPane();
        private Component[] tabComponents = {new start(), new quests()};
        private String[] tabCaptions = {"Start", "Quests"};
        public static void main(String[] args) {
                core Engine = new core();               
        }
        public core(){
                JFrame window = new JFrame("Window");
                for(int i = 0; i <= tabComponents.length - 1; i++) {
                        tab.addTab(tabCaptions[i], new JScrollPane(tabComponents[i]));
                }
                window.add(tab, BorderLayout.CENTER);               
                window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                window.setSize(500, 300);
                window.setVisible(true);
        }
       
}

---

start.java

Code:

---

import javax.swing.*;

public class start extends JComponent{       
        public start() {
                add(new JLabel("Start"));
        }
}

---

Code:

---

import javax.swing.*;

public class quests extends JComponent{
        public quests() {
                add(new JLabel("Quests"));
        }
}

---

(I used the PHP BB tags for the colouring, just not to confuse anyone)

Your problem may be one of Swing layouts. If I remember correctly, a JComponent uses a null layout as its default layout manager, meaning you are responsible for the location and position of every component you add to it. If you were using a JPanel on the other hand, it would be using a FlowLayout as default, and you'd see your JLabel. Another solution is to set the layout yourself:

Code:

---

// please note that class names should be capilatlized.
class Quests extends JComponent {
  public Quests() {
    setLayout(new FlowLayout());
    add(new JLabel("Quests"));
  }
}

---

Quote:

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Originally Posted by Fubarable

Your problem may be one of Swing layouts. If I remember correctly, a JComponent uses a null layout as its default layout manager, meaning you are responsible for the location and position of every component you add to it. If you were using a JPanel on the other hand, it would be using a FlowLayout as default, and you'd see your JLabel. Another solution is to set the layout yourself:

Code:

---

// please note that class names should be capilatlized.
class Quests extends JComponent {
  public Quests() {
    setLayout(new FlowLayout());
    add(new JLabel("Quests"));
  }
}

---

---

Thank you very much! I really appreciate it.