diff --git a/.gitignore b/.gitignore
index beb988d..26507af 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,48 @@
 
 # vs code
 .vscode/
+.classpath
+.project
+.settings
 
 # mac 
 .DS_Store
+
+
+##################### maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+
+###################### java
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
diff --git a/.travis.yml b/.travis.yml
index f5e0908..61c8e73 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,24 @@
-language: go
-
+# jobs:
+#   include:
+#     - language: go
+#       go:
+#         - "1.12.x"
+#         - "1.13.x"
+#       go_import_path: leetcode
+#       install:
+#         - go get -t -v ./...
+#       script:
+#         - go test ./... -race -coverprofile=coverage.txt -covermode=atomic
+#       after_success:
+#         - bash <(curl -s https://codecov.io/bash)
+#       branches:
+#         only:
+#           - master
+language: generic
 go:
   - "1.12.x"
-
+  - "1.13.x"
 go_import_path: leetcode
-
 install:
   - go get -t -v ./...
 
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..a46e928
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.leetcode</groupId>
+  <artifactId>leetcode</artifactId>
+  <version>0.1.1</version>
+
+  <name>leetcode</name>
+  <!-- FIXME change it to the project's website -->
+  <url>http://www.example.com</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.7</maven.compiler.source>
+    <maven.compiler.target>1.7</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+      <plugins>
+        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.1.0</version>
+        </plugin>
+        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <plugin>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.22.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+        <plugin>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.7.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-project-info-reports-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>
diff --git a/src/main/java/com/leetcode/App.java b/src/main/java/com/leetcode/App.java
new file mode 100644
index 0000000..790c7b5
--- /dev/null
+++ b/src/main/java/com/leetcode/App.java
@@ -0,0 +1,13 @@
+package com.leetcode;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello World!" );
+    }
+}
diff --git a/src/test/java/com/leetcode/AppTest.java b/src/test/java/com/leetcode/AppTest.java
new file mode 100644
index 0000000..c84c9df
--- /dev/null
+++ b/src/test/java/com/leetcode/AppTest.java
@@ -0,0 +1,20 @@
+package com.leetcode;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+{
+    /**
+     * Rigorous Test :-)
+     */
+    @Test
+    public void shouldAnswerWithTrue()
+    {
+        assertTrue( true );
+    }
+}