I'm working on a Java project and need help sorting an array of integers. I've tried using basic sorting algorithms, but I'm not getting the expected results. Can someone provide a code snippet or guide me on implementing a reliable sorting algorithm to sort an array of integers in ascending order?

// Example array to sort
int[] numbers = { 5, 2, 9, 1, 5, 6 };

// Code for sorting the array - seeking an optimal solution
// Insert code snippet or explanation of a sorting algorithm here