黑马程序员——java中的 GUI

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GUI
Graphical user Interface（图形用户接口）
用图形的方式，来显示计算机操作界面
java为GUI提供的界面都存在java.AWT和java.swing两个包中
实例：
public class Jfram extends JFrame{

 public static void main(String[] args) {
  Jfram jf=new Jfram();
  
  jf.setSize(400,300);
  jf.setLocation(300,100);
  jf.setTitle("NUMBER");
  
  jf.setLayout(new FlowLayout());
  
  jf.addWindowListener(new WindowAdapter() {
   public void windowclosing(){
    System.out.print("关闭");
    System.exit(0);
   }
  });//关闭窗口
  TextField tf=new TextField(20);
  Button button=new Button("按钮");
  
  jf.add(tf);
  jf.add(button);//添加按钮
  
//  button.addActionListener(new ActionListener() {
//   
//   @Override
//   public void actionPerformed(ActionEvent arg0) {
//    // TODO Auto-generated method stub
//    System.exit(0);
//   }
//  });//退出按钮
  
  button.addMouseListener(new MouseListener() {
   private int i=0;
   public void mouseClicked(MouseEvent arg0) {
    // TODO Auto-generated method stub
    System.out.println("点击了： "+i++);
   }
   @Override
   public void mouseEntered(MouseEvent arg0) {
    // TODO Auto-generated method stub
    System.out.println("鼠标进入： "+i++);
   }
   @Override
   public void mouseExited(MouseEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   @Override
   public void mousePressed(MouseEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   @Override
   public void mouseReleased(MouseEvent arg0) {
    // TODO Auto-generated method stub
    
   }
  });
  tf.addKeyListener(new KeyListener() {
   
   @Override
   public void keyTyped(KeyEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void keyReleased(KeyEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void keyPressed(KeyEvent e) {
    // TODO Auto-generated method stub
    int code=e.getKeyCode();
    if(!(code >= KeyEvent.VK_0 && code <=KeyEvent.VK_9)){
     System.out.print("非法字符:"+code);
     e.consume();
    }
   }
  });
  
        jf.setVisible(true);
 }

}

简单记事本打开和保存
打开：
public class JFram2 extends JFrame{
    public static Button bt;
    private static TextField tf;
    private static TextArea ta;
   
    private static Dialog d;
    private static Label la;
    private static Button okbt;
 public static void main(String[] args) {
  JFram2 jf=new JFram2();
  jf.setBounds(100, 100, 500, 400);
  jf.setLayout(new FlowLayout());
  jf.setTitle("JAVA");
  
  d=new Dialog(jf, "显示错误",true);
  la=new Label();
  okbt=new Button("确定");
  d.setBounds(200, 150, 300, 200);
  d.setLayout(new FlowLayout());
  d.add(la);
  d.add(okbt);
  
  bt=new Button("转换");
  tf=new TextField(32);
  ta=new TextArea(15,40);
  
  jf.add(tf);
  jf.add(bt);
  jf.add(ta);
  
  bt.addActionListener(new ActionListener() {
   
   public void actionPerformed(ActionEvent e) {
          String text=tf.getText();//获得数据
         
          File file=new File(text);
          if(file.exists() && file.isDirectory()){
           ta.setText("");
           String[] names=file.list();
           for(String name : names){
            ta.append(name+"\t\n");
           }
          }
          else
          {
           String info="您输入信息： "+text+" 是错误 ， 请关闭重新输入";
           la.setText(info);
           d.setVisible(true);
          }
          //tf.setText("");//显示数据  制空
   }
  });
  //按键盘回车键进入事件中
  tf.addKeyListener(new KeyListener() {
   
   @Override
   public void keyTyped(KeyEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void keyReleased(KeyEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void keyPressed(KeyEvent e) {
    // TODO Auto-generated method stub
    if(e.getKeyCode()==KeyEvent.VK_ENTER){
     String text=tf.getText();//获得数据
         
          File file=new File(text);
          if(file.exists() && file.isDirectory()){
           ta.setText("");
           String[] names=file.list();
           for(String name : names){
            ta.append(name+"\t\n");
           }
          }
          else
          {
           String info="您输入信息： "+text+" 是错误 ， 请关闭重新输入";
           la.setText(info);
           d.setVisible(true);
          }
          //tf.setText("");//显示数据  制空
    }
   }
  });
         //关闭弹出的对话框
  d.addWindowListener(new WindowListener() {
   
   @Override
   public void windowOpened(WindowEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
 
   public void windowClosing(WindowEvent arg0) {
    // TODO Auto-generated method stub
    d.setVisible(false);
   }

   @Override
   public void windowActivated(WindowEvent arg0) {
    // TODO Auto-generated method stub
    
   }

   @Override
   public void windowClosed(WindowEvent arg0) {
    // TODO Auto-generated method stub
    
   }

   @Override
   public void windowDeactivated(WindowEvent arg0) {
    // TODO Auto-generated method stub
    
   }

   @Override
   public void windowDeiconified(WindowEvent arg0) {
    // TODO Auto-generated method stub
    
   }

   @Override
   public void windowIconified(WindowEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
  
  });
  //对话框按键
  okbt.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
       d.setVisible(false); 
   }
  });
  
  //对话框回车键
  okbt.addKeyListener(new KeyListener() {
   
   @Override
   public void keyTyped(KeyEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void keyReleased(KeyEvent arg0) {
    // TODO Auto-generated method stub
    
   }
   
   @Override
   public void keyPressed(KeyEvent e) {
    // TODO Auto-generated method stub
    if(e.getKeyCode()==KeyEvent.VK_ENTER){
    d.setVisible(false);
    }
   }
  });
  
  jf.setVisible(true);

 }

}
保存：
import javax.annotation.processing.Filer;
import javax.lang.model.element.Element;
import javax.swing.*;
import javax.tools.FileObject;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileManager.Location;

import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class JFram3 extends JFrame{
    private static Menu me,me2;
    private static MenuBar mb;
    private static MenuItem closeme,saveme,opendme;
    private TextArea ta;
    private FileDialog openfd,savefd;
    private File file;
    //事件体
    public void eventall(){
        closeme.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
    System.exit(0);
   }
  });
        //打开设计
        opendme.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
    openfd.setVisible(true);
    String opendir=openfd.getDirectory();
    String openname=openfd.getFile();
    if(opendir==null ||openname==null)
     return;
    //ta.setText("");
    File file=new File(opendir, openname);
    
     
     try {
      BufferedReader bf=new BufferedReader(new FileReader(file));
      String line=null;
      while((line=bf.readLine())!=null){
       ta.append(line+"\r\n");
      }
      bf.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
     
    
      
    
   }
  });
        //保存设计
        saveme.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
    if(file==null){
     savefd.setVisible(true);
     String savepath=savefd.getDirectory();
     String savename=savefd.getFile();
     if(savepath==null ||savename==null)
      return;
     file=new File(savepath, savename);
    }
    try {
     BufferedWriter bf=new BufferedWriter(new FileWriter(file));
     String text=ta.getText();
     bf.write(text);
     bf.close();
    } catch (IOException e) {
     // TODO: handle exception
     e.printStackTrace();
    }
    
   }
  });
    }
   
    //界面设计
    public void windowfram(){
     JFram3 jf=new JFram3();
  jf.setBounds(100, 100, 500, 400);
  //jf.setLayout(new FlowLayout());
  jf.setTitle("JAVA");
  
  openfd=new FileDialog(jf,"打开窗体",FileDialog.LOAD);
  savefd=new FileDialog(jf,"保存文件",FileDialog.SAVE);
  ta=new TextArea();
  me=new Menu("文件");//菜单项
  me2=new Menu("编辑");
  mb=new MenuBar();
  
  opendme=new MenuItem("打开");
  saveme=new MenuItem("保存");
  closeme=new MenuItem("退出");//子菜单
  
  me.add(opendme);
  me.add(saveme);
  me.add(closeme);
  mb.add(me);
  
  jf.add(ta);
  jf.setMenuBar(mb);
  
  jf.setVisible(true);
    }
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  JFram3 j=new JFram3();
  j.windowfram();
  j.eventall();
  
  
 }

}

 

 

 

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