黑马程序员---AWT编程基础知识课堂笔记---七个程序

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程序一、

创建图形化界面步骤：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)。

class  AwtDemo1 *************************************************

{     public static void main(String[] args)

       {     Frame f = new Frame("my awt");

              f.setSize(500,100);

              f.setLocation(300,200);

              f.setLayout(new FlowLayout());

              Button b = new Button("我是一个按钮");

              f.add(b);

              f.setVisible(true);

              //System.out.println("Hello World!");

       }

}******************************************************************************

程序二、

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。实现关闭按钮的功能。

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);

       }

}

程序三、

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。对程序二进行代码格式的优化

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();       }

}******************************************************************************

程序四、

演示键盘监听和鼠标监听

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();   }

}******************************************************************************

程序五、

练习：制作以下界面

当在文本框中输入路径点击“转到”或者“回车”后会在下面的文本区域显示该路径中所包的所有文件和文件夹的名称，如果路径不存在会弹出提示对话框。

import java.awt.*; *************************************************

import java.awt.event.*;

import java.io.*;

class  MyWindowDemo

{     private Frame f;

       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(25,70);

              d = new Dialog(f,"提示信息-self",true);

              d.setBounds(400,200,240,150);

              d.setLayout(new FlowLayout());

              lab = new Label();

              okBut = new Button("确定");

              d.add(lab);

              d.add(okBut);

              f.add(tf);

              f.add(but);

              f.add(ta);

              myEvent();

              f.setVisible(true);

       }

       private 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);  }

              });

              tf.addKeyListener(new KeyAdapter()

              {     public void keyPressed(KeyEvent e)

                     {     if(e.getKeyCode()==KeyEvent.VK_ENTER)

                                   showDir();

                     }

              });

              but.addActionListener(new ActionListener()

              {     public void actionPerformed(ActionEvent e)

                     {     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 = "您输入的信息："+dirPath+"是错误的。请重输";

                     lab.setText(info);

                     d.setVisible(true);

              }

       }

       public static void main(String[] args)

       {     new MyWindowDemo();       }

}******************************************************************************

程序六、

菜单的实现，完成菜单栏中添加菜单、菜单中添加菜单项和子菜单

import java.awt.*; *************************************************

import java.awt.event.*;

class MyMenuDemo

{     private Frame f;

       private MenuBar mb;

       private Menu m,subMenu;

       private MenuItem closeItem,subItem;

       MyMenuDemo()

       {     init();      }

       public void init()

       {     f = new Frame("my window");

              f.setBounds(300,100,500,600);

              f.setLayout(new FlowLayout());

              mb = new MenuBar();

              m = new Menu("文件");

              subMenu = new Menu("子菜单");

              subItem = new MenuItem("子条目");

              closeItem = new MenuItem("退出");          

              subMenu.add(subItem);

              m.add(subMenu);

              m.add(closeItem);

              mb.add(m);

              f.setMenuBar(mb);

              myEvent();

              f.setVisible(true);

       }

       private void myEvent()

       {     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();    }

}******************************************************************************

程序七、

制作“文件”菜单，包含“打开”、“保存”、“退出”三个菜单项，并实现三个菜单项的功能。

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();       }

}******************************************************************************

八、制作双击执行的jar包

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 -jar

6，双击试试！。哦了。

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