SelectionSort benchmark

SeqInt.java

public void sortSelection()
  {
      //Benchmark time start
      ThreadMXBean threadmxbean = ManagementFactory.getThreadMXBean();
      long startTime;
      long finishTime;

      startTime =  threadmxbean.getCurrentThreadCpuTime();

      int arraySize = numbers.length;
      while (arraySize > 0)
      {
          int largest = findLargestElement(arraySize);
          swap(largest, arraySize - 1);
          arraySize--;
      }

      finishTime = threadmxbean.getCurrentThreadCpuTime();
      System.out.println("Execution time: " + (finishTime-startTime) + " ns" +  System.getProperty("line.separator"));
  }