Java Swing intro
如果有Android app开发经验，快速上手Swing不是问题。UI方面有相似的地方。
简单的几行代码就能抛出一个框框，记录一下操作过程
1.先显示一个框框
EraseBlockGame类是主类，包含了main入口，继承自 JFrame
public class EraseBlockGame extends JFrame{
......
public EraseBlockGame(String GameTitle){ // 构造方法
super(GameTitle);
setSize(408, 640);
setLocationRelativeTo(null);// place in the center of screen
......
setVisible(true);
}
}设置窗口大小，设置窗口在屏幕上的位置，窗口可见
public static void main(String args[]){
EraseBlockGame e = new EraseBlockGame("Erase Block Game");
}运行一下程序，弹出一个窗口；窗口名称为Erase Block Game
2.菜单栏
菜单栏有菜单按钮，以及菜单选项
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;- JMenuBar 是整个菜单
- JMenu 是菜单栏上的单个按钮
- JMenuItem 点开单个餐单键，弹出的子选项item
public class EraseBlockGame extends JFrame{
private static final long serialVersionUID = 1L;
private JMenuBar menuBar = new JMenuBar();
private JMenu mGame = new JMenu("Game");
private JMenuItem miNewGame = new JMenuItem("New game");
private JMenuItem miExit = new JMenuItem("Exit");
......
}如果多几个选项，总是new似乎不大好，用简单工厂来代替new
定义JMenuFactory，里面有创建JMenu的方法
package com.rust.util;
import javax.swing.JMenu;
public class JMenuFactory {
JMenu menu;
public JMenuFactory(){
}
public JMenu createMenu(String title){
JMenu menu = new JMenu(title);
return menu;
}
}同样定义JMenuItemFactory
package com.rust.util;
import javax.swing.JMenuItem;
public class JMenuItemFactory {
JMenuItem item;
public JMenuItemFactory(){
}
public JMenuItem createMenuItem(String title){
item = new JMenuItem(title);
return item;
}
}原来的new就可以替换为
private JMenu mGame;
private JMenu mControl;
private JMenu mInfo;
private JMenuItem miNewGame;
private JMenuItem miExit;
......
mGame = menuFactory.createMenu("Game");
mControl = menuFactory.createMenu("Control");
mInfo = menuFactory.createMenu("Info");
miNewGame = miFactory.createMenuItem("New game");
miExit = miFactory.createMenuItem("Exit");在构造函数中给菜单item添加ActionListener，和Android app的Button差不多
miNewGame.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
}
});
miExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
mGame.add(miNewGame);//这里添加的顺序就是排列的顺序
mGame.add(miExit);//往menu中添加子项
menuBar.add(mGame);
menuBar.add(mControl);//这里添加的顺序就是排列的顺序
setJMenuBar(menuBar);如此看来，Swing活在了Android中
3.放置按钮
此时界面上只有一些菜单按键，多摆几个按钮上去看看
定义一个控制面板类ControlBoard 继承自 JPanel
/**
* 控制面板，提供很多快捷的控制功能
* @author Rust Fisher
*/
public class ControlBoard extends JPanel{
private JButton btnStart;
private JButton btnStop;
private JButton btnPause;
private JButton btnReset;
private JButton btnExit;
/*定义一个按钮区域areaButton，用来存放btn*/
private JPanel areaButton = new JPanel(new GridLayout(5, 1));
private EraseBlockGame game;
/*按钮区域的框框*/
private Border border = new EtchedBorder(EtchedBorder.RAISED, Color.WHITE,Color.gray);
public ControlBoard(final EraseBlockGame game){
setLayout(new GridLayout(3,1,0,1));
this.game = game;//用于控制
btnStart = new JButton("Start");
btnStart.setEnabled(true);
btnStop = new JButton("Stop");
btnStop.setEnabled(false);
btnPause = new JButton("Pause");
btnPause.setEnabled(false);
btnReset = new JButton("Reset");
btnReset.setEnabled(true);
btnExit = new JButton("Exit");
btnExit.setEnabled(true);
areaButton.add(btnStart);
areaButton.add(btnPause);
areaButton.add(btnStop);
areaButton.add(btnReset);
areaButton.add(btnExit);
areaButton.setBorder(border);
add(areaButton);// 把按钮区添加到控制面板上
btnStart.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// go go go
}
});
btnExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);//886
}
});
}
......
}在EraseBlockGame类里加载按钮区域
public class EraseBlockGame extends JFrame{
......
private ControlBoard controlBoard;
public EraseBlockGame(String title){
......
Container container = getContentPane();
controlBoard = new ControlBoard(this);
container.add(controlBoard, BorderLayout.EAST);//添加控制面板
......
}
}于是按钮就被装到程序上了
其他的就先不纠结了，Swing了解个大概就好；可以多看看android开发