Java动态运行编译好的类两种方法

动态运行编译好的类

Runtime run = Runtime.getRuntime();
Process process = run.exec("java -cp d:/myjava HelloWorld");
// Process process = run.exec("jaca -cp"+dir+" "+classFile);

//通过反射运行程序
public static void runJavaClassByReflect(String dir,String calssFile) throws Exception{
try{
URL[] urls = new URL[]{new URL("file:"+dir)};
URLClassLoader loader = new URLClassLoader(urls);
Class c = loader.loadClass(classFile);
//调用加载类的main方法
c.getMethod("main",String[].class).invoke(null,(Object)new String[]{});
}catch(Exception e){
e.printStackTrace();
}
}