// this works
if ("Show".equals (obj))
{  
  try {  
    String command= "/usr/bin/xterm -e  javac  panel_1.java"; 
    Runtime rt = Runtime.getRuntime();      
    Process pr = rt.exec(command);

    BufferedReader in = new BufferedReader(new InputStreamReader(pr.getInputStream()));    
    String line = null;  
    while ((line = in.readLine()) != null) {  
      System.out.println(line); 
    }  
  } catch (IOException e)  {  
    e.printStackTrace();  
  }  
}

这将打开一个xterm窗口,在panel_1.java上调用javac,如果panel_1.java是有效文件,它将进行编译.然后xterm窗口关闭.好吧,我想从编译器中获取警告等信息,并将其放入列表或textArea中.
有任何想法吗？？？

解决方法:

Java 6从javax.tools包中获得了JavaCompiler,它为编译器提供了API,而无需运行外部进程. (阅读我链接的javadoc！)

Here也是有关此问题的一些小教程.