Can you explain what is meant by the concept of Expression in programming?

In Java, parameters are passed by value, but for objects (including arrays), a copy of the reference to the object is passed. This means that if you modify the array's contents inside a method, these changes will be visible in the calling code because both refer to the same object.

However, if inside the method you assign a new array to the parameter (e.g., arr = new int[]{...}), this new reference will not affect the reference in the caller.

Example:

public void modifyArray(int[] arr) {
    arr[0] = 10; // modify array contents
    arr = new int[]{1, 2, 3}; // assign new array - will not affect external array
}

public static void main(String[] args) {
    int[] myArray = {0, 0, 0};
    modifyArray(myArray);
    System.out.println(myArray[0]); // prints 10
}

Thus, you cannot directly get a reference to a new array created inside a method from the caller, but you can modify the contents of the passed array.