src/main/java/hhn/temp/project/provider/Database.java

@@ -5,7 +5,7 @@ import java.nio.file.Path;
 import java.sql.SQLException;
 
 public interface Database {
-  public void connect() throws SQLException, IOException;
+  public void connect() throws SQLException;
   public void close() throws SQLException;
   public void clearDatabase() throws SQLException;
 }

src/main/java/hhn/temp/project/provider/DatabaseManager.java

@@ -7,8 +7,9 @@ import java.sql.SQLException;
 import java.util.Collection;
 
 public interface DatabaseManager<E> extends Database {
-  public void saveObjects(Collection<E> objects) throws ExecutionControl.NotImplementedException, IOException, SQLException;
-  public Collection<E> getObjects() throws ExecutionControl.NotImplementedException;
-  public void saveObject(E object) throws IOException, SQLException;
+  public void saveObjects(Collection<E> objects) throws SQLException;
+  public Collection<E> getObjects() throws SQLException;
+  public void saveObject(E object) throws SQLException;
   public E getObject(int id) throws SQLException;
+  public void deleteObject(int id) throws SQLException;
 }

src/main/java/hhn/temp/project/provider/SimpleDatabaseManager.java

@@ -48,7 +48,7 @@ public class SimpleDatabaseManager<E> implements DatabaseManager<E> {
   }
 
   @Override
-  public void saveObjects(Collection<E> objects) throws IOException, SQLException {
+  public void saveObjects(Collection<E> objects) throws SQLException {
     for (E obj : objects) {
       saveObject(obj);
     }
@@ -56,8 +56,8 @@ public class SimpleDatabaseManager<E> implements DatabaseManager<E> {
 
 
   @Override
-  public Collection<E> getObjects() throws ExecutionControl.NotImplementedException {
-    throw new ExecutionControl.NotImplementedException("Not Implemented!");
+  public Collection<E> getObjects() throws SQLException {
+    return null;
   }
 
   @Override
@@ -103,7 +103,12 @@ public class SimpleDatabaseManager<E> implements DatabaseManager<E> {
   }
 
   @Override
-  public void connect() throws SQLException, IOException {
+  public void deleteObject(int id) throws SQLException {
+    throw new SQLException("Not implemented yet");
+  }
+
+  @Override
+  public void connect() throws SQLException {
     connection = DriverManager.getConnection("jdbc:mysql://sql7.freesqldatabase.com/sql7810540?user=sql7810540&password=mXdJCFtDZz");
   }