public class Main {

public static void main(String[] args) {

int[] intArray = { 20, 35, -15, 7, 55, 1, -22 };

for (int lastUnsortedIndex = intArray.length - 1; lastUnsortedIndex > 0; lastUnsortedIndex--) { for (int i = 0; i < lastUnsortedIndex; i++) { if (intArray[i] > intArray[i + 1]) { swap(intArray, i, i + 1); } } }

for (int i = 0; i < intArray.length; i++) { System.out.println(intArray[i]); }

}

public static void swap(int[] array, int i, int j) {

if (i == j) { return; }

int temp = array[i]; array[i] = array[j]; array[j] = temp;

} }

please explain every line of the code, i am new to java. also on the for loop part why + 1 and - 1. and what does this program do ?