much implementation, ready for first test

Sorting/SelectionSorter.java

@@ -2,4 +2,20 @@ package Sorting;
 
 public class SelectionSorter extends Sorter {
     //a class to sort an array of numbers using selection sort
+    public SelectionSorter(String filename){
+        super("selection", filename);
+    }
+
+    void sort(){
+        for(int i=0;i<numbers.length-1;i++){
+            int currentMinIndex = i;
+            for(int j=i+1;j<numbers.length;j++){
+                int comp = compare(numbers[currentMinIndex],numbers[j]);
+                if(comp>0){
+                    currentMinIndex = j;
+                }
+            }
+            swap(numbers[i],numbers[currentMinIndex]);
+        }
+    }
 }