what is bubble sort used for in java code example

Example 1: bubble sort java

public class BubbleSortExample {  
    static void bubbleSort(int[] arr) {  
        int n = arr.length;  
        int temp = 0;  
         for(int i=0; i < n; i++){  
                 for(int j=1; j < (n-i); j++){  
                          if(arr[j-1] > arr[j]){  
                                 //swap elements  
                                 temp = arr[j-1];  
                                 arr[j-1] = arr[j];  
                                 arr[j] = temp;  
                         }  
                          
                 }  
         }  
  
}

Example 2: bubble sort java

public class DemoBubbleSort
{
   void bubbleSort(int[] arrNum)
   {
      int num = arrNum.length;
      for(int a = 0; a < num - 1; a++)
      {
         for(int b = 0; b < num - a - 1; b++)
         {
            if(arrNum[b] > arrNum[b + 1])
            {
               int temp = arrNum[b];
               arrNum[b] = arrNum[b + 1];
               arrNum[b + 1] = temp;
            }
         }
      }
   }
   void printingArray(int[] arrNum)
   {
      int number = arrNum.length;
      for(int a = 0; a < number; ++a)
      {
         System.out.print(arrNum[a] + " ");
         System.out.println();
      }
   }
   public static void main(String[] args)
   {
      DemoBubbleSort bs = new DemoBubbleSort();
      int[] arrSort = {65, 35, 25, 15, 23, 14, 95};
      bs.bubbleSort(arrSort);
      System.out.println("After sorting array: ");
      bs.printingArray(arrSort);
   }
}