diff --git a/java/README.md b/Java/README.md
similarity index 100%
rename from java/README.md
rename to Java/README.md
diff --git a/java/source/.gitignore b/Java/source/.gitignore
similarity index 100%
rename from java/source/.gitignore
rename to Java/source/.gitignore
diff --git a/java/source/LICENSE b/Java/source/LICENSE
similarity index 100%
rename from java/source/LICENSE
rename to Java/source/LICENSE
diff --git a/java/source/pom.xml b/Java/source/pom.xml
similarity index 100%
rename from java/source/pom.xml
rename to Java/source/pom.xml
diff --git a/java/source/src/main/java/com/yitter/contract/IIdGenerator.java b/Java/source/src/main/java/com/yitter/contract/IIdGenerator.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/contract/IIdGenerator.java
rename to Java/source/src/main/java/com/yitter/contract/IIdGenerator.java
diff --git a/java/source/src/main/java/com/yitter/contract/ISnowWorker.java b/Java/source/src/main/java/com/yitter/contract/ISnowWorker.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/contract/ISnowWorker.java
rename to Java/source/src/main/java/com/yitter/contract/ISnowWorker.java
diff --git a/java/source/src/main/java/com/yitter/contract/IdGeneratorException.java b/Java/source/src/main/java/com/yitter/contract/IdGeneratorException.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/contract/IdGeneratorException.java
rename to Java/source/src/main/java/com/yitter/contract/IdGeneratorException.java
diff --git a/java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java b/Java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java
rename to Java/source/src/main/java/com/yitter/contract/IdGeneratorOptions.java
diff --git a/java/source/src/main/java/com/yitter/contract/OverCostActionArg.java b/Java/source/src/main/java/com/yitter/contract/OverCostActionArg.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/contract/OverCostActionArg.java
rename to Java/source/src/main/java/com/yitter/contract/OverCostActionArg.java
diff --git a/java/source/src/main/java/com/yitter/core/SnowWorkerM1.java b/Java/source/src/main/java/com/yitter/core/SnowWorkerM1.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/core/SnowWorkerM1.java
rename to Java/source/src/main/java/com/yitter/core/SnowWorkerM1.java
diff --git a/java/source/src/main/java/com/yitter/core/SnowWorkerM2.java b/Java/source/src/main/java/com/yitter/core/SnowWorkerM2.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/core/SnowWorkerM2.java
rename to Java/source/src/main/java/com/yitter/core/SnowWorkerM2.java
diff --git a/java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java b/Java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java
rename to Java/source/src/main/java/com/yitter/idgen/DefaultIdGenerator.java
diff --git a/java/source/src/main/java/com/yitter/idgen/IdHelper.java b/Java/source/src/main/java/com/yitter/idgen/IdHelper.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/idgen/IdHelper.java
rename to Java/source/src/main/java/com/yitter/idgen/IdHelper.java
diff --git a/java/source/src/main/java/com/yitter/test/GenTest.java b/Java/source/src/main/java/com/yitter/test/GenTest.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/test/GenTest.java
rename to Java/source/src/main/java/com/yitter/test/GenTest.java
diff --git a/java/source/src/main/java/com/yitter/test/StartUp.java b/Java/source/src/main/java/com/yitter/test/StartUp.java
similarity index 100%
rename from java/source/src/main/java/com/yitter/test/StartUp.java
rename to Java/source/src/main/java/com/yitter/test/StartUp.java