rename to distinguish btw number and word sorters

Sorting/NumberQuickSorter.java

@@ -0,0 +1,38 @@
+package Sorting;
+
+public class NumberQuickSorter extends NumberSorter{
+    
+    public NumberQuickSorter(RandomNumberFileReader reader){
+        super("quick sort", reader);
+    }
+
+    public NumberQuickSorter(String qsortVariant, RandomNumberFileReader reader){
+        super(qsortVariant, reader);
+    }
+
+    void sort(){
+        quickSort(0,numbers.length-1);
+    }
+
+    void quickSort(int lowIndex, int highIndex){
+       if(compare(lowIndex,highIndex)<0){
+            int pivot = partition(lowIndex, highIndex);
+            quickSort(lowIndex, pivot-1);
+            quickSort(pivot+1, highIndex);
+       }
+    }
+
+    private int partition(int lowIndex, int highIndex){
+        int pivot = numbers[highIndex];
+        int i = lowIndex-1;
+        for(int j=lowIndex;j<highIndex;j++){
+            if(compare(numbers[j],pivot)<0){
+                i++;
+                swap(i,j);
+            }
+        }
+        swap(i+1, highIndex);
+        return i+1;
+    }
+
+}