黑马程序员_JAVA笔记22——GUI

发布时间:2017-1-22 18:01:55 编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"黑马程序员_JAVA笔记22——GUI",主要涉及到黑马程序员_JAVA笔记22——GUI方面的内容,对于黑马程序员_JAVA笔记22——GUI感兴趣的同学可以参考一下。

------- android培训、java培训、期待与您交流! ---------- 一、GUI  (图形用户界面)         JAVA为GUI提供的对象都存在java.Awt和javax.Swing两个包中。         java.Awt:Abstract Window ToolKit(抽象工具包),需要调用本地系统方法实现功能,属于重量级控件。(比较依赖于平台)         javax.Swing:在AWT的基础上,建立一套图形界面系统,其中提供了更多的组件,而且完全有java实现,增强了移植性,属于轻量级控件(跨平台,在任何平台上都一样) 二、继承关系图         container:为容器,是一个特殊的组件。该组件及其子类中可以通过add方法添加其他组件进来。(其他不能添加组件)         Component:                 Container:                         Window:                                 Frame:窗体                                 Dialog:对话框                                         FileDialog:文件对话框                         Panel:                 Button:                 Label:用于将文字封装成对象                 Checkbox:复选框                 TextComponent:                         TextArea:文本框                         TextField:文本区 三、布局管理器     1、容器中的组件的排放方式,就是布局。     2、常见的布局管理器:             **FlowLayout(流式布局管理器),Panel默认的布局管理器,从左到右的顺序排列。默认水平居中             **BorderLayout(边界布局管理器),Frame默认的布局管理器,东南西北中。默认居中             **GridLayout(网络布局管理器),规则的矩阵             **CardLayout(卡片布局管理器),选项卡             **GridBagLayout(网格包布局管理器),非规则的矩阵 /* 创建图形化界面 1、创建frame窗体 2、对窗体进行基本设置,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) */ import java.awt.*; class AwtDemo {         public  static void main(String[] args)         {         Frame f = new Frame("my awt"); f.setSize(500,400);//设置大小,长宽 f.setLocation(300,200);//设置窗体位置,窗体左上角点距离左侧300,距离上侧200 f.setLayout(new FlowLayout());//设置Frame的布局管理器为FlowLayout Button  b = new Button("这里设置button名称"); f.add(b);         f.setVisible(true);         System.out.println("hello world"); } } 四、事件监听机制特点     **事件源(组件)     **事件(Event)     **监听器(Listener )     **事件处理(引发事件后处理方式) 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,直接获取器对象来用就可以了。我们需要做的就是对产生的动作进行处理。 import java.awt.*; import java.awt.event.*; class AwtDemo {         public  static void main(String[] args)         {         Frame f = new Frame("my awt"); f.setSize(500,400);//设置大小,长宽 f.setLocation(300,200);//设置窗体位置,窗体左上角点距离左侧300,距离上侧200 f.setLayout(new FlowLayout());//设置Frame的布局管理器为FlowLayout Button  b = new Button("这里设置button名称"); f.add(b); f.addWindowListener(new MyWin());         f.setVisible(true);         System.out.println("hello world"); } } /* class MyWin implements WindowListener {         //覆盖7个方法,可是我们只用到了关闭的动作,其他动作都没有用,可是却必须复写,因此实现接口不合适。 } */ //因为WindowListener的子类WindowAdapter已经实现了WindowListener接口, //并覆盖了其中所有方法,那么我们只要继承WindowAdapter覆盖所需要的方法即可 class MyWin extends WindowAdapter {         public void windowClosing(WindowEvent e)         {                 System.out.println("window closing----"+e.toString());                 System.exit(0);//退出程序,也就是关闭窗口         }         public void windowActivated(WindowEvent e)//激活状态,这里指窗体处于最前端         {                 System.out.println("active");         }         public void windowOpened(WindowEvent e)//一打开就执行的动作         {                 System.out.println("windowopen");         } } 五、Action事件 import java.awt.*; import java.awt.event.*; class FrameDemo {         private Frame f;         private Button but;         FrameDemo()         {                 init();         }         public void init()         {                 f = new Frame("my frame");                 f.setBounds(300,100,500,400);                 f.setLayout(new FlowLayout());                 but = new Button("my button");                 //将组件添加到frame中                 f.add(but);                 myEvent();                 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,该选择哪个监听器?                 通过关闭窗体,了解到想要知道哪个组件具备什么特有监听器,需要查看该组件对象的功能。                 Button的描述,addActionListener                 ActionListener,是少有的没有适配器的接口                 */                 button.addActionListener(new ActionListener()//给button添加监听器                 {                         public void actionPerformed(ActionEvent e)                         {                                 System.out.println("button  exit()");                                 System.exit(0);                         }                 });         }         public static void main(String[] args)         {                 new FrameDemo();         } } 六、共性事件,鼠标  键盘事件 import java.awt.*; import java.awt.event.*; class MouseAndKeyEvent {           private Frame f;         private Button but;         private TextField tf;          MouseAndKeyEvent ()         {                 init();         }         public void init()         {                 tf=new TextField(20);                 f = new Frame("my frame");                 f.setBounds(300,100,500,400);                 f.setLayout(new FlowLayout());                 but = new Button("my button");                 //将组件添加到frame中                 f.add(but);                 f.add(tf);                 myEvent();                 f.setVisible(true);         }         private void myEvent()         {                 //判断输入到TextField中的内容是否是数字0-9                 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+"非法");                                         e.consume();//使用此事件,以便不会按照默认的方式由产生此事件的源代码来处理此事件                                                             //输入0-9没问题,但是输入其他字母后,不复合条件,虽然不复合,但默认方式                                                             //还是将字母继续输入,而e.consume()就是禁止字母继续输入                                 }                                                          }                 });                 //给but加上键盘监听器                 but.addKeyListener(new KeyAdapter( )                 {                         public void keyPressed(KeyEvent e)                         {                                 //获得的是键盘上按的键,及其码,下方代码只能返回单字母键,shift等多字母键无法返回                                 System.out.println(e.getKeyChar()+"..."+e.getKeyCode());                                 //返回多字母键                                 System.out.println(KeyEvent.getKeyText(e.getKeyCode()));                                 //按ESC退出窗口,ESC的code为27                                 if(e.getKeyCode()==27)                                         System.exit(0);                                 //按ESC退出窗口,ESC的常量为:VK_ESCAPE                                 if(e.getKeyCode()==KeyEvent.VK_ESCAPE)                                         System.exit(0);                                 //组合键,按ctrl+enter,按两个键的处理方式,原理:按下ctrl不动,再按enter                                 //方法isControlDown()判断ctrl键是否被按下,                                 if (e.isControlDown()&&e.getKeyCode()==KeyEvent.VK_ENTER)                                         System.out.println("ctrl+enter");                         }                 });                 f.addWindowListener(new WindowAdapter()                 {                         public void windowClosing(WindowEvent e)                         {                                 System.exit(0);                         }                 });                 //button上两个监听,addMouseListener中的mouseClick 与addActionListener,这两个动作都能让button活动,但是同时存在时,mouseClick先执行,action后执行。但是一般最好加addActonListener,因为了这个后,键盘也可以让button活动                 but.addMouseListener(new MouseAdapter()                 {                         private int count = 1;                         private int clickCount = 1;                         public void mouseEntered(MouseEvent e)                         {                                 System.out.println("mouse enter component"+count++);                         }                         public void mouseClicked(MouseEvent e)                         {                                 System.out.println("mouse click"+clickCount++);                                        //鼠标双击动作,方法getClickCount获取点击次数                                          if(e.getClickCount()==2)                                                     System.out.println("double clicked");                         }                                          });                     but.addActionListener(new ActionListener()                     {                             public void  actionPerformed(ActionEvent e)                             {                                     System.out.println("action on");                             }                     });         }         public static void main(String[] args)         {                 new MouseAndKeyEvent();         } } 练习:在文本框中输入目录,点击转到按钮,将该怒路中的文件与文件名称列在下面的文本域中 import java.awt.*; import javaawt.event.*; import java.io.*; class MywindowDemo  {         private frame if;         private Textfield tf;         private Button but;         private TextArea ta;          private Dialog d;         private Label lab;         private Button okbut;         MywindowDemo()         {                 init();         }         public void init()         {                 f=new Frame("my window");                 f.setBounds(300,100,600,500);                 f.setLayout(new FlowLayout());                 tf = new TextField(60);                 but = new Button("转到");                 ta = new TextArea(25,47);                 d = new Dialog(f,"提示信息",true);//true 的意思就是不点掉该窗体,不能进行其他操作                  d.setBounds(400,200,200,50 );                 d.setLayout(new FlowLayout());                lab = new Label();                 okbut = new Button("sure");                 d.add(lab);                 d.add(okbut);                 f.add(tf);                 f.add(but);                 f.add(Ta);                 myEvent();                 f.setVisible(true);         }         public void myEvent()         {                 okbut.addActionListener(new ActionListener()                 {                         public void actionPerformed(ActionEvent e )                         {                                 d.setVisible(false);                         }                 });                 d.addWindowListener(new windowAdapter()                 {                          public void windowClosing(WindowEvent e)                         {                                 d.setVisible(false);                         }                    });                 but.addActionListener(new ActionListener()                 {                         public void actionPerformed(ActionEvent e)                         {                                showDir();                         }                 });                 tf.addKeyListener(new KeyAdapter()                 {                         public void keyPressed(KeyEvent e)                         {                                 public void windowClosing(WindowEvent e)                                 {                                         if(e.getKeyCodes()==KeyEvent.VK_ENTER);                                         {                                                 showDir();                                         }                                 }                         }                 });                 f.addWindowListener(new WindowAdapter()                 {                         public void windowClosing(WindowEvent e)                         {                                 System.exit(0);                         }                 });         }         private void showDir()         {                   String dirPath = tf.getText();                                 File dir = new File(dirPath);                                 if(dir.exists()&&dir.isDirectory())                                 {                                         ta.setText("");                                         String[] names=dir.list();                                         for(String name:names)                                         {                                                   ta.append(name+"\r\n");                                         }                                 }else                                 {                                         String info= "info :+dirPath+"....error";                                         lab.setText(info);                                         d.setVisible(true);                                 }                                 tf.setText("");         }         public static void main(String[] args)         {                 new MywindowDemo();         } } 练习:菜单+双击jar包执行 package mymenu;//带包编译,命令行中  javac  -d  c:\myclass  MyMenuDemo.java                                    //打jar包                      jar -cwf my.jar mymenu                                     //配置文件,建一个1.txt,内容:Main-Class: mymenu.MyMenuDemo                                                                                                                 包    主函数类                         //注意:Main-Class: 后有一个空格(标准格式),主函数类后有回车(表示该行结束)。                         //如果没加空格,出现IO异常;如果没有enter,那么1.txt中内容配置不到jar配置文件中。                         //建完配置文件,目的是告诉jar包主函数类是哪个,因此命令行                         //jar -cvfn my.jar 1.txt mymenu                         //另外jar文件需要在本地注册才可以使用,如果是双击安装的jdk就可以不用此步骤                         //如果是复制过来的jdk目录,需要自己配置,工具-文件夹选项-文件类型-新建jar-高级-新建open-浏览   D:\jdk1.6.0_45\bin\javaw.exe -jar        这样就可以了 import java.awt.*; import java.awt.event.*; import java.io.*; public class MyMenuDemo {         private Frame f;         private TextArea ta;         private MenuBar mb;         private Menu m;         private MenuItem closeItem;         private MenuItem subItem;         private MenuItem openItem;         private MenuItem saveItem;         private Menu subMenu;         private FileDialog openDia,saveDia;         File file;         MyMenuDemo()         {                 init();         }         public void init()         {                 f = new Frame("my window");                 f.setBounds(400,300,400,300);                 f.setLayout(new FlowLayout());                 mb =new MenuBar();                 ta= new TextArea();                 m = new Menu("file");                 subMenu = new Menu("子菜单");                 subItem = new MenuItem("sub item");                 closeItem = new MenuItem("eixt");                 openItem = new MenuItem("open");                 saveItem = new MenuItem("save");                 openDia = new FileDialog(f,"open",FileDialog.LOAD);                 saveDia = new FileDialog(f,"save",FIleDialog.SAVE);                 subMenu.add(subItem);                 m.add(closeItem);                 m.add(openItem);                 m.add(saveItem);                 m.add(subMenu);                 mb.add(m);                                  f.setMenuBar(mb);                 f.add(ta);                 myEvent();                 f.setVisible(true);                          }         public 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.close();                                 }                                 catch(IOException ie)                                 {                                         throw new RuntimeException();                                 }                         }                 });                 openItem.addActionListener(new ActionListener()                 {                         public void actionPerformed(ActionEvent e)                         {                                 openDia.setVisible(true);                                 String dirPath = openDia.getDirectory();                                 String fileName=openDia.getFile();                                 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())!=null0                                         {                                                 ta.append(line+"\r\n");                                         }                                 }                                 catch(IOException e)                                 {                                         throw new RuntimeException("read failed");                                 }                         }                 });                 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 MyMenuDemo();         } }

上一篇:黑马程序员_JAVA笔记21——IO流
下一篇:测试全球鹰GX7明星动力组合2.0L+6AT的表现

相关文章

相关评论