formatting time output

Sorting/AlgorithmTester.java

@@ -169,7 +169,7 @@ public class AlgorithmTester{
             System.out.println("\n"+e.getSortType()+" sort took:");
             System.out.println(e.getComparisonsUsed()+" comparisons");
             System.out.println(e.getWritesUsed()+" write operations");
-            System.out.println(e.getTimeUsed().toMillis()+" milliseconds");
+            System.out.println(e.getTimeUsed()+" milliseconds");
         }
         
     }

Sorting/SortResult.java

@@ -1,6 +1,8 @@
 package Sorting;
 
 import java.time.Duration;
+import java.util.Locale;
+import java.text.NumberFormat;
 /**
  * This is a class to hold the efficiencty results of a sorter. We will use this
  * because we can only have one return value from a method, but want to get more
@@ -23,25 +25,27 @@ public class SortResult {
     private Integer [] sortedArray;
     private String comparisonsUsed;
     private String writesUsed;
-    private Duration timeUsed;
+    private String timeUsed;
 
     public SortResult(String st, Integer[] a, long c, long w, Duration t){
         sortType = st;
         sortedArray = a;
+        NumberFormat nf = NumberFormat.getInstance(Locale.US);
         if(c==0){
             comparisonsUsed = "No";
         }
         else{
-        comparisonsUsed = Long.toString(c);
+        comparisonsUsed = nf.format(c);
         }
-        writesUsed = Long.toString(w)
-        timeUsed = t;
+        writesUsed = nf.format(w);
+        timeUsed = nf.format(t.toMillis());
     }
 
     public SortResult(String st, Integer[] a, Duration t){
         sortType = st;
         sortedArray = a;
-        timeUsed = t;
+        NumberFormat nf = NumberFormat.getInstance(Locale.US);
+        timeUsed = nf.format(t.toMillis());
         comparisonsUsed = "Unknown";
         writesUsed = "Unknown";
     }
@@ -54,7 +58,7 @@ public class SortResult {
         return sortedArray;
     }
 
-    public Duration getTimeUsed(){
+    public String getTimeUsed(){
         return timeUsed;
     }