[refactor] move java package to namespace java

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/BasicWalkThrough.java

@@ -13,18 +13,18 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.Booster;
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
-import ml.dmlc.xgboost4j.demo.util.DataLoader;
+import ml.dmlc.xgboost4j.java.Booster;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
+import ml.dmlc.xgboost4j.java.demo.util.DataLoader;
 
 /**
  * a simple example of java wrapper for xgboost

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/BoostFromPrediction.java

@@ -13,14 +13,14 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.Booster;
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
+import ml.dmlc.xgboost4j.java.Booster;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
 
 /**
  * example for start from a initial base prediction

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/CrossValidation.java

@@ -13,14 +13,14 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.io.IOException;
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
 
 /**
  * an example of cross validation

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/CustomObjective.java

@@ -13,17 +13,16 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 
+import ml.dmlc.xgboost4j.java.*;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import ml.dmlc.xgboost4j.*;
-
 /**
  * an example user define objective and eval
  * NOTE: when you do customized loss function, the default prediction value is margin

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/DistTrain.java

@@ -1,14 +1,13 @@
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import ml.dmlc.xgboost4j.java.*;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import ml.dmlc.xgboost4j.*;
-
 
 /**
  * Distributed training example, used to quick test distributed training.

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/ExternalMemory.java

@@ -13,14 +13,14 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.Booster;
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
+import ml.dmlc.xgboost4j.java.Booster;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
 
 /**
  * simple example for using external memory version

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/GeneralizedLinearModel.java

@@ -13,15 +13,15 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.Booster;
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
-import ml.dmlc.xgboost4j.demo.util.CustomEval;
+import ml.dmlc.xgboost4j.java.Booster;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
+import ml.dmlc.xgboost4j.java.demo.util.CustomEval;
 
 /**
  * this is an example of fit generalized linear model in xgboost

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/PredictFirstNtree.java

@@ -13,15 +13,15 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.Booster;
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
-import ml.dmlc.xgboost4j.demo.util.CustomEval;
+import ml.dmlc.xgboost4j.java.Booster;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
+import ml.dmlc.xgboost4j.java.demo.util.CustomEval;
 
 /**
  * predict first ntree

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/PredictLeafIndices.java

@@ -13,15 +13,15 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo;
+package ml.dmlc.xgboost4j.java.demo;
 
 import java.util.Arrays;
 import java.util.HashMap;
 
-import ml.dmlc.xgboost4j.Booster;
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.XGBoost;
-import ml.dmlc.xgboost4j.XGBoostError;
+import ml.dmlc.xgboost4j.java.Booster;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.XGBoost;
+import ml.dmlc.xgboost4j.java.XGBoostError;
 
 /**
  * predict leaf indices

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/util/CustomEval.java

@@ -13,14 +13,14 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo.util;
+package ml.dmlc.xgboost4j.java.demo.util;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import ml.dmlc.xgboost4j.DMatrix;
-import ml.dmlc.xgboost4j.IEvaluation;
-import ml.dmlc.xgboost4j.XGBoostError;
+import ml.dmlc.xgboost4j.java.DMatrix;
+import ml.dmlc.xgboost4j.java.IEvaluation;
+import ml.dmlc.xgboost4j.java.XGBoostError;
 
 /**
  * a util evaluation class for examples

jvm-packages/xgboost4j-demo/src/main/java/ml/dmlc/xgboost4j/java/demo/util/DataLoader.java

@@ -13,7 +13,7 @@
  See the License for the specific language governing permissions and
  limitations under the License.
  */
-package ml.dmlc.xgboost4j.demo.util;
+package ml.dmlc.xgboost4j.java.demo.util;
 
 import java.io.*;
 import java.util.ArrayList;