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package project5;

public class MergeSorter
{

public MergeSorter(int[] anArray)
{
a = anArray;
}

public void sort()
{
if (a.length <= 1) return;
int[] first = new int[a.length / 2];
int[] second = new int[a.length - first.length];
System.arraycopy(a, 0, first, 0, first.length);
System.arraycopy(a, first.length, second, 0, second.length);
MergeSorter firstSorter = new MergeSorter(first);
MergeSorter secondSorter = new MergeSorter(second);
firstSorter.sort();
secondSorter.sort();
merge(first, second);
}


private void merge(int[] first, int[] second)
{
int iFirst = 0;
int iSecond = 0;
int j = 0;

while (iFirst < first.length && iSecond < second.length)
{
 if (first[iFirst] < second[iSecond])
 {
    a[j] = first[iFirst];
    iFirst++;
 }
 else
 {
    a[j] = second[iSecond];
    iSecond++;
 }
 j++;
}

System.arraycopy(first, iFirst, a, j, first.length - iFirst);

System.arraycopy(second, iSecond, a, j, second.length - iSecond);
}

private int[] a;
}