diff --git a/src/main/java/com/scaler/lld/design/assignments/singleton/FileBasedConfigurationManagerImpl.java b/src/main/java/com/scaler/lld/design/assignments/singleton/FileBasedConfigurationManagerImpl.java
index 15470fc..2f8f2f8 100644
--- a/src/main/java/com/scaler/lld/design/assignments/singleton/FileBasedConfigurationManagerImpl.java
+++ b/src/main/java/com/scaler/lld/design/assignments/singleton/FileBasedConfigurationManagerImpl.java
@@ -2,49 +2,67 @@
 
 public class FileBasedConfigurationManagerImpl extends FileBasedConfigurationManager {
 
+    private static FileBasedConfigurationManager fileBasedConfigurationManager;
+
+    private FileBasedConfigurationManagerImpl(){
+    }
+
     @Override
     public String getConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        if(properties.containsKey(key)) return properties.getProperty(key);
+        return null;
     }
 
     @Override
     public <T> T getConfiguration(String key, Class<T> type) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getConfiguration'");
+        String value=properties.getProperty(key);
+        T ans=null;
+        if(value!=null){
+            ans=convert(value,type);
+        }
+        return ans;
     }
 
     @Override
     public void setConfiguration(String key, String value) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        properties.setProperty(key,value);
     }
 
     @Override
     public <T> void setConfiguration(String key, T value) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'setConfiguration'");
+        properties.setProperty(key,(String)value);
     }
 
     @Override
     public void removeConfiguration(String key) {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'removeConfiguration'");
+        properties.remove(key);
     }
 
     @Override
     public void clear() {
         // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'clear'");
+        properties.clear();
     }
 
     public static FileBasedConfigurationManager getInstance() {
         // TODO Auto-generated method stub
-        return null;
+        if(fileBasedConfigurationManager==null){
+            synchronized (FileBasedConfigurationManagerImpl.class){
+                if(fileBasedConfigurationManager==null){
+                    fileBasedConfigurationManager=new FileBasedConfigurationManagerImpl();
+                }
+            }
+        }
+        return fileBasedConfigurationManager;
     }
 
     public static void resetInstance() {
-        // TODO Auto-generated method stub
+        fileBasedConfigurationManager=null;
     }
 
 }
\ No newline at end of file