Java Swing How to - Size a JScrollPane in a JTabbedPane in a JFrame

Question

We would like to know how to size a JScrollPane in a JTabbedPane in a JFrame.

Answer

import java.awt.BorderLayout;
//w  w  w .j ava 2s . co m
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;

public class Main {
  JTabbedPane tabbedPane;
  JPanel panelTab1;
  JPanel panelTab2;

  public Main() {
    Box box1 = Box.createVerticalBox();
    for (int i = 1; i <= 100; i++) {
      box1.add(new JLabel("This is Label #" + i));
    }

    Box box2 = Box.createVerticalBox();
    for (int i = 1; i <= 100; i++) {
      box2.add(new JLabel("This is Label #" + i));
    }

    JPanel boxPanel1 = new JPanel();
    JPanel boxPanel2 = new JPanel();
    boxPanel1.add(box1);
    boxPanel2.add(box2);
    JScrollPane panel1Scroll = new JScrollPane(boxPanel1);
    JScrollPane panel2Scroll = new JScrollPane(boxPanel2);

    panelTab1 = new JPanel(new BorderLayout());
    panelTab2 = new JPanel(new BorderLayout());
    panelTab1.add(panel1Scroll);
    panelTab2.add(panel2Scroll);

    tabbedPane = new JTabbedPane();
    tabbedPane.add(panelTab1, "Panel 1");
    tabbedPane.add(panelTab2, "Panel 2");

    JFrame frame = new JFrame();
    frame.add(tabbedPane);
    frame.pack();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    Main gui = new Main();
  }
}