Java Swings/Swing Top Level Containers

JFrameEdit

  JFrameEx.java
import javax.swing.JFrame;
import javax.swing.JLabel;

public class JFrameEx extends JFrame {

    JFrameEx() {
        JLabel label1 = new JLabel("My Label");
        add(label1);
        pack();
        setVisible(true);
    }
    
    public static void main(String args[]) {
        JFrameEx e1 = new JFrameEx();
    }
}

JOptionPaneEdit

JAppletEdit