create index from file at startup

src/main/java/cc/javastudio/raw/FileHandler.java

@@ -100,6 +100,24 @@ public final class FileHandler implements Closeable {
         }
     }
 
+    public void loadIndex () throws IOException {
+        if (dbFile.length()==0){
+            return;
+        }
+        long bytePos = 0;
+        while (bytePos < dbFile.length()) {
+            dbFile.seek(bytePos);
+            boolean IsDeleted = dbFile.readBoolean();
+            if (!IsDeleted ) {
+                Index.getInstance().add(bytePos);
+            }
+            bytePos += BYTE_LENGTH;
+            int recordLength = dbFile.readInt();
+            bytePos +=  INT_LENGTH + recordLength;
+
+        }
+    }
+
     public void close() throws IOException {
         dbFile.close();
     }

src/main/java/cc/javastudio/testapp/TestApp.java

@@ -13,10 +13,11 @@ public class TestApp {
 
             try {
                 FileHandler fh = new FileHandler("DBServer.db");
-                fh.add("Johñ Doe", 44, "New-York", "www-404", "Blue VW Beetle" );
+                fh.loadIndex();
+                System.out.println("Number of rows in database " + Index.getInstance().getTotalRowNumberOfRows());
+                fh.add("Pipi Langkous", 44, "New-York", "www-404", "Blue VW Beetle");
                 fh.add("Jane Doe", 40, "New-York", "www-404", "Red VW Beetle" );
-                fh.add("Jane BLue", 36, "New-York", "wcz-430", "yellow VW Beetle" );
-                Person person  = fh.readRow(2);
+                Person person  = fh.readRow(0);
                 System.out.println(person);
 
             } catch (IOException e) {