2 files changed, 10 insertions, 20 deletions

diff --git a/java/MyMyBatis/src/AbstractDAO.java b/java/MyMyBatis/src/AbstractDAO.java
index 916d511..142b69f 100644
--- a/java/MyMyBatis/src/AbstractDAO.java
+++ b/java/MyMyBatis/src/AbstractDAO.java
@@ -20,9 +20,10 @@ public abstract class AbstractDAO<TObject, TMapper>
 
     static public SqlConnection getSqlConnection() { return conn; }
 
-    protected abstract class CallBack<TRet, TMapper>
+    @FunctionalInterface
+    public interface CallBack<TRet, TMapper>
     {
-        public abstract TRet call(TMapper m);
+        public TRet call(TMapper m);
     }
 
     protected int execInt(boolean commit, CallBack<Integer, TMapper> cb)
diff --git a/java/MyMyBatis/src/AbstractDAOOperations.java b/java/MyMyBatis/src/AbstractDAOOperations.java
index e39f680..6fcd6e4 100644
--- a/java/MyMyBatis/src/AbstractDAOOperations.java
+++ b/java/MyMyBatis/src/AbstractDAOOperations.java
@@ -4,45 +4,34 @@ import java.util.List;
 
 public abstract class AbstractDAOOperations<TObject, TIdentity, TMapper extends AbstractMapper<TObject, TIdentity>> extends AbstractDAO<TObject, TMapper>
 {
+
     public int insert(final TObject obj)
     {
-        return execInt(true, new CallBack<Integer, TMapper>() {
-            public Integer call(TMapper m) { return m.insert(obj); }
-        });
+        return execInt(true, m -> m.insert(obj));
     }
 
     public int update(final TObject obj)
     {
-        return execInt(true, new CallBack<Integer, TMapper>() {
-            public Integer call(TMapper m) { return m.update(obj); }
-        });
+        return execInt(true, m -> m.update(obj));
     }
 
     public int delete(final TObject obj)
     {
-        return execInt(true, new CallBack<Integer, TMapper>() {
-            public Integer call(TMapper m) { return m.delete(obj); }
-        });
+        return execInt(true, m -> m.delete(obj));
     }
 
     public int count()
     {
-        return execInt(false, new CallBack<Integer, TMapper>() {
-            public Integer call(TMapper m) { return m.count(); }
-        });
+        return execInt(false, m -> m.count());
     }
 
     public List<TObject> select()
     {
-        return execObjects(false, new CallBack<List<TObject>, TMapper>() {
-            public List<TObject> call(TMapper m) { return m.select(); }
-        });
+        return execObjects(false, m -> m.select());
     }
 
     public TObject selectOne(final TIdentity id)
     {
-        return execObject(false, new CallBack<TObject, TMapper>() {
-            public TObject call(TMapper m) { return m.selectOne(id); }
-        });
+        return execObject(false, m -> m.selectOne(id));
     }
 }