关于javac

[xy200362]

public static void main(String[] args) {

try {
// System.out.println("cmd.exe" + "/C " + "javac -classpath E:/workspace/JavacTest/ E:/workspace/JavacTest/cn/com/xy/javac/Hello.java");

// Process process = Runtime.getRuntime().exec("cmd /C dir *.*");
Process process = Runtime.getRuntime().exec(new String[]{"cmd","/C ","javac -classpath E:\\workspace\\JavacTest\\ E:\\workspace\\JavacTest\\cn\\com\\xy\\javac\\Hello.java"});
InputStream inputStream = process.getInputStream();

byte[] buffer = new byte[8095];
int count = 0;
String result = "";

while((count = inputStream.read(buffer, 0, 8095)) != -1)
{
result += new String(buffer,0,count);
}

System.out.println(result);



} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}



如果我直接在控制平台下用javac -classpath E:\workspace\JavacTest\ E:\workspace\JavacTest\cn\com\xy\javac\Hello.java
是可以编译的
请高手指教上面的Runtime类哪里有问题