Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Main {
    static int N = 12;
    JDialog dlg = new JDialog();
    DefaultListModel model = new DefaultListModel();
    JList list = new JList(model);
    JScrollPane sp = new JScrollPane(list);
    int count;

    public Main() {
        list.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
        JPanel panel = new JPanel();
        panel.add(new JButton(new AbstractAction("Add") {
            @Override
            public void actionPerformed(ActionEvent e) {
                append();
                if (count <= N) {
                    list.setVisibleRowCount(count);
                    dlg.pack();
                }
            }
        }));
        panel.add(new JButton(new AbstractAction("Remove") {
            @Override
            public void actionPerformed(ActionEvent e) {
                int itemNo = list.getSelectedIndex();
                if (itemNo > -1) {
                    removeActionPerformed(e, itemNo);
                }
            }
        }));
        for (int i = 0; i < N - 2; i++) {
            this.append();
        }
        list.setVisibleRowCount(N - 2);
        dlg.add(sp, BorderLayout.CENTER);
        dlg.add(panel, BorderLayout.SOUTH);
        dlg.pack();
        dlg.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        dlg.setVisible(true);
    }

    private void removeActionPerformed(ActionEvent e, int itemNo) {
        model = (DefaultListModel) list.getModel();
        if (model.size() > 0) {
            if (itemNo > -1) {
                model.remove(itemNo);
            }
        }
    }

    private void append() {
        model.addElement("String " + String.valueOf(++count));
        list.ensureIndexIsVisible(count - 1);
    }

    public static void main(String[] a_args) {
        Main pd = new Main();
    }
}