動態執行編譯好的類

• 通過Runtime.getRuntime()執行啟動新的程序執行

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

• 通過反射執行編譯好的類

    //通過反射執行程式
    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);
            //呼叫載入類的main方法
            c.getMethod("main",String[].class).invoke(null,(Object)new String[]{});
        }catch
 
(Exception e){
            e.printStackTrace();
        }
    }