diff --git a/javaJosa/build.gradle b/javaJosa/build.gradle
new file mode 100644
index 0000000..d67ebdf
--- /dev/null
+++ b/javaJosa/build.gradle
@@ -0,0 +1,14 @@
+group 'com.github.dotkebi'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}
diff --git a/javaJosa/gradle/wrapper/gradle-wrapper.jar b/javaJosa/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..ca78035
Binary files /dev/null and b/javaJosa/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/javaJosa/gradle/wrapper/gradle-wrapper.properties b/javaJosa/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e31bd35
--- /dev/null
+++ b/javaJosa/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Tue Aug 16 18:35:16 KST 2016
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.13-all.zip
diff --git a/javaJosa/gradlew b/javaJosa/gradlew
new file mode 100644
index 0000000..27309d9
--- /dev/null
+++ b/javaJosa/gradlew
@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
diff --git a/javaJosa/gradlew.bat b/javaJosa/gradlew.bat
new file mode 100644
index 0000000..832fdb6
--- /dev/null
+++ b/javaJosa/gradlew.bat
@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/javaJosa/settings.gradle b/javaJosa/settings.gradle
new file mode 100644
index 0000000..c11ab77
--- /dev/null
+++ b/javaJosa/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'josa'
+
diff --git a/javaJosa/src/main/java/Josa.java b/javaJosa/src/main/java/Josa.java
new file mode 100644
index 0000000..4838ab6
--- /dev/null
+++ b/javaJosa/src/main/java/Josa.java
@@ -0,0 +1,72 @@
+import java.util.HashMap;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * translated by dotkebi@gmail.com on 2016-08-16.
+ */
+public class Josa {
+
+    private Map<String, JosaPair> josaPatternPaird = new HashMap<>();
+
+    public Josa() {
+        josaPatternPaird.put("(이)가", new JosaPair("이", "가"));
+        josaPatternPaird.put("(와)과", new JosaPair("과", "와"));
+        josaPatternPaird.put("(을)를", new JosaPair("을", "를"));
+        josaPatternPaird.put("(은)는", new JosaPair("은", "는"));
+        josaPatternPaird.put("(아)야", new JosaPair("아", "야"));
+        josaPatternPaird.put("(이)여", new JosaPair("이여", "여"));
+        josaPatternPaird.put("(으)로", new JosaPair("으로", "로"));
+        josaPatternPaird.put("(이)라", new JosaPair("이라", "라"));
+    }
+
+    public String replace(String src) {
+        StringBuilder stringBuilder = new StringBuilder();
+        Pattern pattern = Pattern.compile("\\(이\\)가|\\(와\\)과|\\(을\\)를|\\(은\\)는|\\(아\\)야|\\(이\\)여|\\(으\\)로|\\(이\\)라");
+        Matcher matcher = pattern.matcher(src);
+        int lastHeadIndex = 0;
+
+        while (matcher.find()) {
+            String group = matcher.group();
+            JosaPair josaPair = josaPatternPaird.get(group);
+            int endIndexOfBefore = matcher.end();
+            String before = src.substring(lastHeadIndex, endIndexOfBefore);
+
+            stringBuilder.append(before.replace(group, ""));
+
+            String josa = josaPair.getJosa1();
+            if (matcher.start() > 0) {
+                char prevChar = src.substring(matcher.start() - 1, endIndexOfBefore).charAt(0);
+                if (!((hasJong(prevChar) && !group.equals("(으)로")) ||
+                        (hasJongExceptRieul(prevChar) && group.equals("(으)로")))) {
+                    josa = josaPair.getJosa2();
+                }
+            }
+            stringBuilder.append(josa);
+            lastHeadIndex = endIndexOfBefore;
+        }
+        stringBuilder.append(src.substring(lastHeadIndex, src.length()));
+        return stringBuilder.toString();
+    }
+
+    private boolean hasJong(char inChar) {
+        // 가 ~ 힣
+        if (inChar >= 0xAC00 && inChar <= 0xD7A3) {
+            int localCode = inChar - 0xAC00; // 가~ 이후 로컬 코드
+            int jongCode = localCode % 28;
+            return jongCode > 0;
+        }
+        return false;
+    }
+
+    private boolean hasJongExceptRieul(char inChar) {
+        if (inChar >= 0xAC00 && inChar <= 0xD7A3) {
+            int localCode = inChar - 0xAC00;
+            int jongCode = localCode % 28;
+            return !(jongCode == 8 || jongCode == 0);
+        }
+        return false;
+    }
+
+}
diff --git a/javaJosa/src/main/java/JosaPair.java b/javaJosa/src/main/java/JosaPair.java
new file mode 100644
index 0000000..f93cb3a
--- /dev/null
+++ b/javaJosa/src/main/java/JosaPair.java
@@ -0,0 +1,21 @@
+/**
+ * translated by dotkebi@gmail.com on 2016-08-16.
+ */
+public class JosaPair {
+
+    private String josa1;
+    private String josa2;
+
+    public JosaPair(String josa1, String josa2) {
+        this.josa1 = josa1;
+        this.josa2 = josa2;
+    }
+
+    public String getJosa1() {
+        return josa1;
+    }
+
+    public String getJosa2() {
+        return josa2;
+    }
+}
diff --git a/javaJosa/src/main/java/Korean.java b/javaJosa/src/main/java/Korean.java
new file mode 100644
index 0000000..0cd8c63
--- /dev/null
+++ b/javaJosa/src/main/java/Korean.java
@@ -0,0 +1,13 @@
+
+/**
+ * translated by dotkebi@gmail.com on 2016-08-16.
+ */
+public class Korean {
+
+    static Josa josa = new Josa();
+
+    public static String replaceJosa(String src) {
+        return josa.replace(src);
+    }
+
+}
diff --git a/javaJosa/src/test/java/JosaTest.java b/javaJosa/src/test/java/JosaTest.java
new file mode 100644
index 0000000..b74083a
--- /dev/null
+++ b/javaJosa/src/test/java/JosaTest.java
@@ -0,0 +1,46 @@
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author by myoungjin on 2016-09-27.
+ */
+public class JosaTest {
+
+    @Test
+    public void josaTest() {
+        String[] sources = {
+                "네(이)가 잘못했어. 확률(이)가 이상해. 덫(이)가 깔렸어."
+                , "너(와)과 함께 할게. 글(와)과 그림. 빛(와)과 어둠."
+                , "수녀(을)를 존경했어. 남자들(을)를 입히다. 버튼(을)를 만지지 마."
+                , "우리(은)는 끝이야. 쌀(은)는 필요없어. 갑옷(은)는 찢었다."
+                , "진우(아)야, 그것도 몰라? 경렬(아)야, 진정해. 상현(아)야, 뭐해?"
+                , "진우(이)여, 닥쳐라. 경렬(이)여, 이리 오라. 상현(이)여, 아무 일도 아니다."
+                , "부두(으)로 가야 해. 대궐(으)로 가거나. 집(으)로 갈래?"
+                , "나(이)라고 어쩔 수 있겠니? 별(이)라고 불러줘. 라면(이)라고 했잖아."
+                , "라면(이)라면 어떨까? 밥(이)라능~"
+                , "너(이)라면 어떨까? 나(이)라능~"
+        };
+
+        String[] expects = {
+                "네가 잘못했어. 확률이 이상해. 덫이 깔렸어."
+                , "너와 함께 할게. 글과 그림. 빛과 어둠."
+                , "수녀를 존경했어. 남자들을 입히다. 버튼을 만지지 마."
+                , "우리는 끝이야. 쌀은 필요없어. 갑옷은 찢었다."
+                , "진우야, 그것도 몰라? 경렬아, 진정해. 상현아, 뭐해?"
+                , "진우여, 닥쳐라. 경렬이여, 이리 오라. 상현이여, 아무 일도 아니다."
+                , "부두로 가야 해. 대궐로 가거나. 집으로 갈래?"
+                , "나라고 어쩔 수 있겠니? 별이라고 불러줘. 라면이라고 했잖아."
+                , "라면이라면 어떨까? 밥이라능~"
+                , "너라면 어떨까? 나라능~"
+        };
+
+        for (int i = 0; i < sources.length; i++) {
+            String source = sources[i];
+            String expect = expects[i];
+            assertEquals(Korean.replaceJosa(source), expect);
+        }
+
+    }
+
+}