#Run private method java reflection code
In this example, there is a class containing private fields, and under the class there is code for accessing private fields through reflection. This method, unfortunately, cannot be used in all situations: at the Java bytecode level, calling a private method uses a different opcode (invokespecial) than. You can not access the method or field when it is private in the usual way, java compiler does not allow that. getMethod () We can use getMethod () to find any public method of the class or any of its superclasses. Note important thing is that if you are using Javas reflection API to test your private method then arguments to the private methods need to be of object class. Answer (1 of 15): Use code setAccessible(true)/code on your Method object before using its code invoke/code method. The Class object, representing the type in which the method is defined, provides two ways of doing this. The methods Class.getField(String name) and Class.getFields() only return the common fields, so neither of them has any effect. Firstly, we need to get a Method object that reflects the method we want to invoke. In order to access private fields, you need to call Class.getDeclaredField(String name) or Class.getDeclaredFields() method. Where Reflection is used The Reflection API of Java. However, because you don't often need to deal with it, I won't repeat it here. Through reflection, we can call a method at runtime independent of their access specifier. If you try to use this method in JAVA APPLET, you need to modify the SecurityManager slightly. Note: This code is only valid when you run it in a separate Java program, just like you do some unit tests or regular programs. If we want to know behavior of the class, interface of a class file, manipulation classes, fields, methods, and constructors then we can use reflection API c. Although we usually think that it is feasible to access the private fields and private methods of other classes through JAVA's reflection mechanism, it is actually not that difficult.