Non-static variable s caused incorrect accumulation of reversed characters. Overwriting value in the loop meant only the last reversed string was printed. Here is the corrected version reverses each string in the array in-place and prints the entire reversed array.

public class ReverseStringArray { public static void main(String[] args) { String[] array = {"ABCD", "EFGH", "IJKL", "MNOP"}; for (int i = 0; i < array.length / 2; i++) { String temp = array[i]; array[i] = array[array.length - 1 - i]; array[array.length - 1 - i] = temp; } for (String str : array) { System.out.print(str + " "); } } }

You can find the more details on this link where I shared.

I don't understand this well:

From looking at the documentation, it seems that the QAndroidJniObject constructor and methods have to be attaching and detaching the current thread to and from the JVM, which isn't going to work in a JNI thread that's already attached to the JVM.

Does this mean that, if I call C++ function(that uses QAndroidJniObject) from java JNI class, it is not going to work?
Because as I understand, QAndroidJniObject is attaching and detaching the current thread to and from the JVM, and the JNI java object that is calling native functions, is already attached to the JVM.
Please correct me if I am wrong.

@ashajg how to registerReceiver in c++?