- JDK ：OpenJDK-11
- OS ：CentOS 7.6.1810
- IDE ：Eclipse 2019‑03
- typesetting ：Markdown
code
package per.jizuiku.gui;
import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
/**
* @author 给最苦
* @date 2019/06/30
* @blog www.cnblogs.com/jizuiku
*/
public class Demo {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Frame f = new Frame();
// 三原色的数值
int r = 4;
int g = 5;
int b = 70;
Color bgColor = new Color(r, g, b);
// 设置背景颜色
f.setBackground(bgColor);
// 设置窗体布局 - 流式布局
f.setLayout(new FlowLayout());
Button button = new Button("change bgcolor");
button.setSize(30, 50);
// 该按钮对鼠标的变化进行监听
button.addMouseListener(new MouseAdapter() {
// 使用 alt+ / , 查看 该适配器类下有哪些方法
// 然后阅读英文,不会的时候 再去看API和查文献
// 当鼠标进入时
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
f.setBackground(Color.BLUE);
}
// 当鼠标离开时,一切又回到了原点
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
f.setBackground(bgColor);
}
});
int width = 400;
int height = 500;
f.setSize(width, height);
f.add(button);
f.setVisible(true);
}
}
result
sourceCode
/*
* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.awt.event;
/**
* An abstract adapter class for receiving mouse events.
* The methods in this class are empty. This class exists as
* convenience for creating listener objects.
*
* Mouse events let you track when a mouse is pressed, released, clicked,
* moved, dragged, when it enters a component, when it exits and
* when a mouse wheel is moved.
*
* Extend this class to create a {@code MouseEvent}
* (including drag and motion events) or/and {@code MouseWheelEvent}
* listener and override the methods for the events of interest. (If you implement the
* {@code MouseListener},
* {@code MouseMotionListener}
* interface, you have to define all of
* the methods in it. This abstract class defines null methods for them
* all, so you can only have to define methods for events you care about.)
*
* Create a listener object using the extended class and then register it with
* a component using the component's {@code addMouseListener}
* {@code addMouseMotionListener}, {@code addMouseWheelListener}
* methods.
* The relevant method in the listener object is invoked and the {@code MouseEvent}
* or {@code MouseWheelEvent} is passed to it in following cases:
*
* - when a mouse button is pressed, released, or clicked (pressed and released)
*
- when the mouse cursor enters or exits the component
*
- when the mouse wheel rotated, or mouse moved or dragged
*
*
* @author Carl Quinn
* @author Andrei Dmitriev
*
* @see MouseEvent
* @see MouseWheelEvent
* @see MouseListener
* @see MouseMotionListener
* @see MouseWheelListener
* @see Tutorial: Writing a Mouse Listener
*
* @since 1.1
*/
public abstract class MouseAdapter implements MouseListener, MouseWheelListener, MouseMotionListener {
/**
* {@inheritDoc}
*/
public void mouseClicked(MouseEvent e) {}
/**
* {@inheritDoc}
*/
public void mousePressed(MouseEvent e) {}
/**
* {@inheritDoc}
*/
public void mouseReleased(MouseEvent e) {}
/**
* {@inheritDoc}
*/
public void mouseEntered(MouseEvent e) {}
/**
* {@inheritDoc}
*/
public void mouseExited(MouseEvent e) {}
/**
* {@inheritDoc}
* @since 1.6
*/
public void mouseWheelMoved(MouseWheelEvent e){}
/**
* {@inheritDoc}
* @since 1.6
*/
public void mouseDragged(MouseEvent e){}
/**
* {@inheritDoc}
* @since 1.6
*/
public void mouseMoved(MouseEvent e){}
}
resource
- [ JDK ] openjdk.java.net
- [ doc - 参考 ] docs.oracle.com/en/java/javase/11
- [ 规范 - 推荐 ] yq.aliyun.com/articles/69327
- [ 规范 - 推荐 ] google.github.io/styleguide
- [ 源码 ] hg.openjdk.java.net
- [ OS ] www.centos.org
- [ IDE ] www.eclipse.org/downloads/packages
- [ 平台 ] www.cnblogs.com
感谢帮助过 给最苦 的人们。
Java、Groovy和Scala等基于JVM的语言，优秀，值得学习。
规范的命名和代码格式等，有助于沟通和理解。
JVM的配置、监控与优化，比较实用，值得学习。