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import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingUtilities;
public class MainClass {
public static void main(String[] a) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JScrollPaneDemo());
f.setSize(500, 500);
f.setVisible(true);
}
}
class JScrollPaneDemo extends JPanel {
public void init() {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
makeGUI();
}
});
} catch (Exception exc) {
System.out.println("Can't create because of " + exc);
}
}
private void makeGUI() {
setLayout(new BorderLayout());
JPanel jp = new JPanel();
jp.setLayout(new GridLayout(20, 20));
int b = 0;
for (int i = 0; i < 20; i++) {
for (int j = 0; j < 20; j++) {
jp.add(new JButton("Button " + b));
++b;
}
}
int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
JScrollPane jsp = new JScrollPane(jp, v, h);
add(jsp, BorderLayout.CENTER);
}
}
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