diff --git a/.gitignore b/.gitignore
index c7e5935f..8bb94d79 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,32 +6,21 @@
 **/temp/
 **/Debug
 **/Release
+**/gradle
 
 *.DS_Store
-
 *.classpath
-
-!build.gradle
-
-# Compiled class file
+*.project
 *.class
-
-# Log file
 *.log
-
-# BlueJ files
 *.ctxt
-
-# Mobile Tools for Java (J2ME)
 .mtj.tmp/
-
-# Package Files #
 *.jar
 *.war
 *.ear
 *.zip
 *.tar.gz
 *.rar
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+
+!build.gradle
diff --git a/eomcs-java-basic/.settings/org.eclipse.buildship.core.prefs b/eomcs-java-basic/.settings/org.eclipse.buildship.core.prefs
deleted file mode 100644
index bd21f27d..00000000
--- a/eomcs-java-basic/.settings/org.eclipse.buildship.core.prefs
+++ /dev/null
@@ -1,2 +0,0 @@
-#Mon Sep 18 10:12:00 KST 2017
-connection.project.dir=../
diff --git a/eomcs-java-basic/.settings/org.eclipse.jdt.core.prefs b/eomcs-java-basic/.settings/org.eclipse.jdt.core.prefs
deleted file mode 100644
index a2e0a5d7..00000000
--- a/eomcs-java-basic/.settings/org.eclipse.jdt.core.prefs
+++ /dev/null
@@ -1,13 +0,0 @@
-#
-#Mon Sep 18 13:38:11 KST 2017
-org.eclipse.jdt.core.compiler.debug.localVariable=generate
-org.eclipse.jdt.core.compiler.compliance=1.8
-org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.debug.sourceFile=generate
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
-org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.debug.lineNumber=generate
-eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.source=1.8
-org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
diff --git a/eomcs-java-basic/gradle/wrapper/gradle-wrapper.properties b/eomcs-java-basic/gradle/wrapper/gradle-wrapper.properties
deleted file mode 100644
index f16d2666..00000000
--- a/eomcs-java-basic/gradle/wrapper/gradle-wrapper.properties
+++ /dev/null
@@ -1,5 +0,0 @@
-distributionBase=GRADLE_USER_HOME
-distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
-zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-bin.zip