using Collection.sort(List<T> ) method as key ingredient , sorting becomes no hard job ! :)

SortArrayOneStep.java

import java.util.*;

public class SortArrayOneStep {

	public static void main(String[] args) {
		
		Integer[] arr = {5,4,3,2,1};
		printArray(arr);
		Arrays.sort(arr);
		printArray(arr);

	}
	
	
}