String className = "my.class.name";
Object classObj = null;
try {
classObj = Class.forName(className);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Method classMethod = null;
try {
classMethod = classObj.getClass().getMethod("method", param1.class, param2.class, ..);
} catch (SecurityException | NoSuchMethodException e) {
e.printStackTrace();
}
try {
classMethod.invoke(classObj, arg1, args2, ..);
} catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException) {
e.printStackTrace();
}