Array Reverse without using secondary array in java

 public int[] reverse(int [] array){

    if(array == null || array.length <= 1){
        System.out.println("Invalid array.");
    }
    for (int i = 0; i < array.length / 2; i++) {
        int temp = array[i];
        array[i] = array[array.length - 1 - i];
        array[array.length - 1 - i] = temp;
    }
    return array;
}