example8_8.java

书中的例题

/* Runtime类应用 */
import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
public class Example8_8
{  public static void main(String args[])
   {  FileWindow win=new FileWindow();
      win.pack();
      win.addWindowListener(new WindowAdapter()  //窗口适配器。
          {public void windowClosing(WindowEvent e)
              {  System.exit(0);
              }
          });
      win.setBounds(200,180,550,360);
      win.setVisible(true);
   }
}

class  FileWindow extends JFrame implements ActionListener,Runnable
{  Thread            compiler=null;   //负责编译的线程。
   Thread            run_prom=null;   //负责运行程序的线程。
   boolean           bn=true;
   CardLayout        mycard;
   File              file_saved=null;   
   JButton           button_input_text,
	                 button_compiler_text,
                     button_compiler,
	                 button_run_prom,
	                 button_see_doswin;   
   JPanel p=new JPanel();
   JTextArea input_text=new JTextArea(),   //程序输入区。
   compiler_text=new JTextArea(),          //编译出错显示区。
   dos_out_text=new JTextArea();           //程序的输出信息。
   JTextField input_flie_name_text=new JTextField("编译文件");
   JTextField run_file_name_text=new JTextField("主类");
   FileWindow()
   {  super("Java语言编译器");
      mycard=new CardLayout();
      compiler=new Thread(this);
      run_prom=new Thread(this);
	  button_input_text=new JButton("程序输入区（白色）");
      button_compiler_text=new JButton("编译结果区（粉红色）");
      button_see_doswin=new  JButton("程序运行结果（浅蓝色）");
      button_compiler=new JButton("编译程序");
      button_run_prom=new JButton("运行应用程序");
      p.setLayout(mycard);                 //设置卡片布局
	  p.add("input",input_text);           //定义卡片名称
	  p.add("compiler",compiler_text);     //定义卡片名称
      p.add("dos",dos_out_text);           //定义卡片名称
      add(p,"Center");
      compiler_text.setBackground(Color.pink);
      dos_out_text.setBackground(Color.cyan);
	  JPanel p1=new JPanel();
	  p1.setLayout(new GridLayout(3,3));   //设置表格布局
	  p1.add(button_input_text);
	  p1.add(button_compiler_text); 
      p1.add( button_see_doswin); 
      p1.add(new JLabel("输入编译文件名(.java) :")); 
	  p1.add(input_flie_name_text); 
	  p1.add(button_compiler);
      p1.add(new JLabel("输入应用程序主类名:"));	  
      p1.add(run_file_name_text);
	  p1.add(button_run_prom);
	//  add(p1,BorderLayout.NORTH); 
      add(p1,"North");
	  button_input_text.addActionListener(this);
      button_compiler_text.addActionListener(this);
      button_compiler.addActionListener(this); 
      button_run_prom.addActionListener(this);
      button_see_doswin.addActionListener(this);
   }
   public void actionPerformed(ActionEvent e) 
   {  if(e.getSource()==button_input_text)
        {  mycard.show(p,"input");
        }
      else if(e.getSource()==button_compiler_text)
       {  mycard.show(p,"compiler");
       }
      else if(e.getSource()==button_see_doswin)
       {  mycard.show(p,"dos");
       }
      else if(e.getSource()==button_compiler)
      {   if(!(compiler.isAlive()))
             {  compiler=new Thread(this);
             }
          try{  compiler.start();
             }
          catch(Exception eee){}
          mycard.show(p,"compiler");
      }
     else if(e.getSource()==button_run_prom)
     {  if(!(run_prom.isAlive()))
             {  run_prom =new Thread(this);
             }
          try{  run_prom.start();
             }
          catch(Exception eee){} 
        mycard.show(p,"dos");
     }
   }
   public void run()
   {  if(Thread.currentThread()==compiler)
        {  compiler_text.setText(null);   
           String temp=input_text.getText().trim(); 
           byte buffer[]=temp.getBytes(); 
           int b=buffer.length;
           String flie_name;
		   flie_name=input_flie_name_text.getText().trim();
           try{  file_saved=new File(flie_name);
                 FileOutputStream writefile;
				 writefile=new FileOutputStream(file_saved);
                 writefile.write(buffer,0,b);writefile.close();
              }
           catch(IOException e5)
             {  System.out.println("Error "); }
          try{  Runtime rt=Runtime.getRuntime();
                InputStream in=
                 rt.exec("javac "+flie_name).getErrorStream();
                BufferedInputStream bin=new BufferedInputStream(in);
                byte shuzu[]=new byte[100];
                int n;boolean bn=true;
                while((n=bin.read(shuzu,0,100))!=-1)
                   {  String s=null;
                      s=new String(shuzu,0,n);
                      compiler_text.append(s);
                      if(s!=null) bn=false;
                    }
                if(bn) 
                    {  compiler_text.append("编译正确");  } 
             } 
           catch(IOException e1){ System.out.println(e1);} 
       }
      else if(Thread.currentThread()==run_prom)
       {   dos_out_text.setText(null);
           try{  Runtime rt=Runtime.getRuntime();
                 String path=run_file_name_text.getText().trim();
                 InputStream in=rt.exec("java  "+path).getInputStream();
                 BufferedInputStream bin=new BufferedInputStream(in);
                 byte zu[]=new byte[150];
                 int m;String s=null;
                 while((m=bin.read(zu,0,150))!=-1)
                    {  s=new String(zu,0,m);
                       dos_out_text.append(s);
                    }
                } 
            catch(IOException e1){ System.out.println(e1);} 
        } 
   }
}