Lab4.java

import java.lang.NullPointerException;

public class Lab4{
   public static void main(String[] args){
      int[] a1 = {1,2,3,5,4};
      int[] a2 = {5,4,3,2,1};
      int[] a3 = {3,4,5,2,1};
      int[] a4 = {1,2,3,4,5};
      int[] a5 = {5,5,5,1,3};
      int[] a6 = null; 
      
      try{
         int[] b1 = sort(a1);
         int[] b2 = sort(a2);
         int[] b3 = sort(a3);
         int[] b4 = sort(a4);
         int[] b5 = sort(a5);
         int[] b6 = sort(a6);
      }
      catch(NullPointerException e){
         System.out.println("Null array entered");
      }
      
   }
   public static int[] sort(int[] a){
      int curr = 0;
      
      for(int i = 0; i < a.length; i++){
         for(int j = i + 1; j < a.length; j++){
            if(a[j] > a[i]){
               curr = a[i];
               a[i] = a[j];
               a[j] = curr;
            }
         } 
      }
      return a;
   }
}