End section 1

tp/src/main/java/org/example/Main.java

@@ -182,17 +182,23 @@ public class Main {
     }
     public static void OrderArray(){
         int size_array = contactArray.length;
-        Contact[] newContactArray = new Contact[size_array];
-        for(int i = 0; i < size_array -1; i++){
-            int test = contactArray[i].getPers().getFirst_name().compareTo(contactArray[i + 1].getPers().getFirst_name());
-            if(test < 0){
-                newContactArray[i] = contactArray[i+1];
-                newContactArray[i+1] = contactArray[i];
-            }
-            else{
-                newContactArray[i] = contactArray[i];
+        if(size_array > 1){
+            Contact[] newContactArray = new Contact[size_array];
+            for(int i = 0; i < size_array - 1; i++){ //-1 as we check +1 later
+                String nameP1 = contactArray[i].getPers().getFirst_name();
+                String nameP2 = contactArray[i+1].getPers().getFirst_name();
+                int test = nameP1.compareTo(nameP2); //Return distance between 2 letter (f and a = -5 / a and b = 1)
+                if(test > 0){
+                    newContactArray[i] = contactArray[i+1];
+                    newContactArray[i+1] = contactArray[i];
+                }
+                else{
+                    newContactArray[i] = contactArray[i];
+                }
+                if(i == size_array - 2){ //-2 to take last iteration only (as we do "i < size -1")
+                    contactArray = newContactArray;
+                }
             }
         }
-        contactArray = newContactArray;
     }
 }
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