《透视java》第四章

可以使用-Xbootclasspath参数将一个目录或者jar文件添加到启动类路径中

 

具体用法参考sun官方文档如下：

 

-Xbootclasspath/p: path

Specify a colon-separated path of directires, JAR archives, and ZIP archives to prepend in front of the default bootstrap class path. Note: Applications that use this option for the purpose of overriding a class in rt.jar should not be deployed as doing so would contravene the Java 2 Runtime Environment binary code license.

访问私有类成员----->利用反射

例如：

Class [] paramTypes = new Class[]{String.class,boolean.class};

Method method = layout.getClass().getDeclaredMethod("myPrivete",paramTypes);

//Private methods are not  accessible  by default

method.setAccessible(true);

Object[]  params = new Object[]{key,new Boolean(true)};

Object result = method.invoke(layout,params);

java政策文件  设置准予通过反射访问声明的成员以及禁止访问检查的许可

grant{

permission  java.lang.RuntimePermission "accessDeclaredMembers";

permission  java.lang.reflect.ReflectPermission "suppressAccessChecks";

};