黑马程序员---Java基础--22天(GUI)

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1.GUI(概述)

2.GUI(布局)

3.GUI(Frame)

4.GUI(事件监听机制)

5.GUI(窗体事件)

import java.awt.*;import java.awt.event.*;/*创建图形化界面：1，创建frame窗体。2，对窗体进行基本设置。比如大小，位置，布局。3，定义组件。4，将组件通过窗体的add方法添加到窗体中。5，让窗体显示，通过setVisible(true)事件监听机制的特点：1，事件源。2，事件。3，监听器。4，事件处理。事件源：就是awt包或者swing包中的那些图形界面组件。事件：每一个事件源都有自己特有的对应事件和共性事件。监听器：将可以触发某一个事件的动作（不只一个动作）都已经封装到了监听器中。以上三者，在java中都已经定义好了。直接获取其对象来用就可以了。我们要做的事情是，就是对产生的动作进行处理。*/class  AwtDemo{public static void main(String[] args) {Frame f = new Frame("my awt");f.setSize(500,400);f.setLocation(300,200);f.setLayout(new FlowLayout());Button b = new Button("我是一个按钮");f.add(b);f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.out.println("我关");System.exit(0);}public void windowActivated(WindowEvent e) {System.out.println("我活了。");}public void windowOpened(WindowEvent e) {System.out.println("我被打开了,hahahhahah");}});f.setVisible(true);//System.out.println("Hello World!");}}/*class MyWin implements WindowListener{//覆盖7个方法。可以我只用到了关闭的动作。//其他动作都没有用到，可是却必须复写。}//因为WindowListener的子类WindowAdapter已经实现了WindowListener接口。//并覆盖了其中的所有方法。那么我只要继承自Windowadapter覆盖我需要的方法即可。class MyWin extends WindowAdapter{public void windowClosing(WindowEvent e){//System.out.println("window closing---"+e.toString());System.exit(0);}}*///练习，定义一个窗体，在窗体中添加一个按钮具备关闭该窗体的功能。

6.GUI(Action事件)

import java.awt.*;import java.awt.event.*;class  FrameDemo{//定义该图形中所需的组件的引用。private Frame f;private Button but;FrameDemo(){init();}public void init(){f = new Frame("my frame");//对frame进行基本设置。f.setBounds(300,100,600,500);f.setLayout(new FlowLayout());but = new Button("my button");//将组件添加到frame中f.add(but);//加载一下窗体上事件。myEvent();//显示窗体;f.setVisible(true);}private void myEvent(){f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});//让按钮具备退出程序的功能/*按钮就是事件源。那么选择哪个监听器呢？通过关闭窗体示例了解到，想要知道哪个组件具备什么样的特有监听器。需要查看该组件对象的功能。 通过查阅button的描述。发现按钮支持一个特有监听addActionListener。*/but.addActionListener(new ActionListener(){private int count = 1;public void actionPerformed(ActionEvent e){//System.out.println("退出，按钮干的");//System.exit(0);//f.add(new Button("Button-"+(count++)));//f.setVisible(true);//f.validate();//System.out.println(e.getSource());Button b = (Button)e.getSource();Frame f1 = (Frame)b.getParent();f1.add(new Button("button-"+count++));f1.validate();}});}public static void main(String[] args) {new FrameDemo();}}

7.GUI(鼠标事件)

8.GUI(键盘事件)

9.GUI(练习-列出指定目录内容)

10.GUI(对话框Dialog)

import java.awt.*;import java.awt.event.*;class MouseAndKeyEvent {private Frame f;private Button but;private TextField tf;MouseAndKeyEvent(){init();}public void init(){f = new Frame("my frame");f.setBounds(300,100,600,500);f.setLayout(new FlowLayout());tf = new TextField(20);but = new Button("my button");f.add(tf);f.add(but);myEvent();f.setVisible(true);}private void myEvent(){f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});tf.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){int code = e.getKeyCode();if(!(code>=KeyEvent.VK_0 && code<=KeyEvent.VK_9)){System.out.println(code+".....是非法的");e.consume();}}});//给But添加一个键盘监听。but.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){if(e.isControlDown()&&e.getKeyCode()==KeyEvent.VK_ENTER)//System.exit(0);System.out.println("ctrl+enter is run");//System.out.println(KeyEvent.getKeyText(e.getKeyCode())+"...."+e.getKeyCode());}});/*but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){System.out.println("action ok");}});*//*but.addMouseListener(new MouseAdapter(){private int count = 1;private int clickCount = 1;public void mouseEntered(MouseEvent e) {System.out.println("鼠标进入到该组件"+count++);}public void mouseClicked(MouseEvent e){if(e.getClickCount()==2)System.out.println("双击动作"+clickCount++);}});*/}public static void main(String[] args) {new MouseAndKeyEvent();}}

11.GUI(菜单)

12.GUI(练习-打开文件)

13.GUI(练习-保存文件)

14.GUI(jar包双击执行)

package mymenu;import java.awt.*;import java.awt.event.*;import java.io.*;public class MyMenuTest{private Frame f;private MenuBar bar;private TextArea ta;private Menu fileMenu;private MenuItem openItem,saveItem,closeItem;private FileDialog openDia,saveDia;private File file;MyMenuTest(){init();}public void init(){f = new Frame("my window");f.setBounds(300,100,650,600);bar = new MenuBar();ta = new TextArea();fileMenu = new Menu("文件");openItem = new MenuItem("打开");saveItem = new MenuItem("保存");closeItem = new MenuItem("退出");fileMenu.add(openItem);fileMenu.add(saveItem);fileMenu.add(closeItem);bar.add(fileMenu);f.setMenuBar(bar);openDia = new FileDialog(f,"我要打开",FileDialog.LOAD);saveDia = new FileDialog(f,"我要保存",FileDialog.SAVE);f.add(ta);myEvent();f.setVisible(true);}private void myEvent(){saveItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if(file==null){saveDia.setVisible(true);String dirPath = saveDia.getDirectory();String fileName = saveDia.getFile();if(dirPath==null || fileName==null)return ;file = new File(dirPath,fileName);}try{BufferedWriter bufw  = new BufferedWriter(new FileWriter(file));String text = ta.getText();bufw.write(text);//bufw.flush();bufw.close();}catch (IOException ex){throw new RuntimeException();}}});openItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){openDia.setVisible(true);String dirPath = openDia.getDirectory();String fileName = openDia.getFile();//System.out.println(dirPath+"..."+fileName);if(dirPath==null || fileName==null)return ;ta.setText("");file = new File(dirPath,fileName);try{BufferedReader bufr = new BufferedReader(new FileReader(file));String line = null;while((line=bufr.readLine())!=null){ta.append(line+"\r\n");}bufr.close();}catch (IOException ex){throw new RuntimeException("读取失败");}}});closeItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){System.exit(0);}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}public static void main(String[] args) {new MyMenuTest();}}/*如何制作可以双击执行的jar包呢？1，将多个类封装到了一个包(package)中。2，定义一个jar包的配置信息。定义一个文件a.txt 。文件内容内容为：Main-Class:(空格)包名.类名(回车)3，打jar包。jar -cvfm my.jar a.txt 包名4，通过winrar程序进行验证，查看该jar的配置文件中是否有自定义的配置信息。5，通过工具--文件夹选项--文件类型--jar类型文件，通过高级，定义该jar类型文件的打开动作的关联程序。jdk\bin\javaw.exe -jar6，双击试试！。哦了。*/

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