Answer 1

To do a bubble sort you just need to swap two value and to do it until the table is sort:
https://en.wikipedia.org/wiki/Bubble_sort
An possible implementation of the bubble sort in Java:
int n = intArray.length;
int temp = 0;
for(int i=0; i < n; i++){
for(int j=1; j < (n-i); j++){
if(intArray[j-1] > intArray[j]){
temp = intArray[j-1];
intArray[j-1] = intArray[j];
intArray[j] = temp;
}
}
}