Hallo 
Was ist denn auf Using Top-Level Containers (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components) gemeint mit:
Aber wie schaut die zweite Variante aus?
Was ist denn auf Using Top-Level Containers (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components) gemeint mit:
Die erste Variante habe ich verstanden:
Java:
import java.awt.Container;
import javax.swing.*;
public class X {
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("HelloWorldSwing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
//Add the ubiquitous "Hello World" label.
JLabel label = new JLabel("Hello World");
JComponent pane = (JComponent)(frame.getContentPane()); // Variante 1: casten
pane.add(label);
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
