Java tutorial
//package com.java2s; //License from project: Apache License import java.awt.Dialog; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.Timer; public class Main { public static void fadeIn(final Dialog win) { if (!win.isUndecorated()) { return; } final Timer timer = new Timer(30, null); timer.setRepeats(true); timer.addActionListener(new ActionListener() { private float opacity = 0; @Override public void actionPerformed(ActionEvent e) { opacity += 0.05f; win.setOpacity(Math.min(opacity, 1f)); if (opacity >= 1) { timer.stop(); } } }); win.setOpacity(0); timer.start(); win.setVisible(true); } }