Any way to Invoke a private method?

You can invoke private method with reflection. Modifying the last bit of the posted code:

Method method = object.getClass().getDeclaredMethod(methodName);method.setAccessible(true);Object r = method.invoke(object);

There are a couple of caveats. First, getDeclaredMethod will only find method declared in the current Class, not inherited from supertypes. So, traverse up the concrete class hierarchy if necessary. Second, a SecurityManager can prevent use of the setAccessible method. So, it may need to run as a PrivilegedAction (using AccessController or Subject).

Use getDeclaredMethod() to get a private Method object and then use method.setAccessible() to allow to actually call it.

If the method accepts non-primitive data type then the following method can be used to invoke a private method of any class:

public static Object genericInvokeMethod(Object obj, String methodName,            Object... params) {        int paramCount = params.length;        Method method;        Object requiredObj = null;        Class<?>[] classArray = new Class<?>[paramCount];        for (int i = 0; i < paramCount; i++) {            classArray[i] = params[i].getClass();        }        try {            method = obj.getClass().getDeclaredMethod(methodName, classArray);            method.setAccessible(true);            requiredObj = method.invoke(obj, params);        } catch (NoSuchMethodException e) {            e.printStackTrace();        } catch (IllegalArgumentException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }        return requiredObj;    }

The Parameter accepted are obj, methodName and the parameters. For example

public class Test {private String concatString(String a, String b) {    return (a+b);}}

Method concatString can be invoked as

Test t = new Test();    String str = (String) genericInvokeMethod(t, "concatString", "Hello", "Mr.x");