Use a JScrollPane and force its preferredSize to your given size (or set the scrollPane container LayoutManager to null and call setBounds() on the scrollpane). Also set the scrollbar policies. Here is a small sample of that:
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
public class Test {
public static void main(String... args) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
for (int i = 0; i < 10; i++) {
panel.add(new JButton("Hello-" + i));
}
JScrollPane scrollPane = new JScrollPane(panel);
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
scrollPane.setBounds(50, 30, 300, 50);
JPanel contentPane = new JPanel(null);
contentPane.setPreferredSize(new Dimension(500, 400));
contentPane.add(scrollPane);
frame.setContentPane(contentPane);
frame.pack();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setVisible(true);
}
}
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