diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..7e31822b23d122987551367ca4f2d79afc97c1a6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,216 @@
+# Created by https://www.gitignore.io/api/java,gradle,eclipse,intellij,visualstudiocode
+# Edit at https://www.gitignore.io/?templates=java,gradle,eclipse,intellij,visualstudiocode
+
+### Eclipse ###
+.metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# PyDev specific (Python IDE for Eclipse)
+*.pydevproject
+
+# CDT-specific (C/C++ Development Tooling)
+.cproject
+
+# CDT- autotools
+.autotools
+
+# Java annotation processor (APT)
+.factorypath
+
+# PDT-specific (PHP Development Tools)
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# Tern plugin
+.tern-project
+
+# TeXlipse plugin
+.texlipse
+
+# STS (Spring Tool Suite)
+.springBeans
+
+# Code Recommenders
+.recommenders/
+
+# Annotation Processing
+.apt_generated/
+
+# Scala IDE specific (Scala & Java development for Eclipse)
+.cache-main
+.scala_dependencies
+.worksheet
+
+### Eclipse Patch ###
+# Eclipse Core
+.project
+
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# Annotation Processing
+.apt_generated
+
+.sts4-cache/
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator/
+
+### 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*
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+
+### Gradle ###
+.gradle
+build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties
+
+### Gradle Patch ###
+**/build/
+
+# End of https://www.gitignore.io/api/java,gradle,eclipse,intellij,visualstudiocode
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000000000000000000000000000000000000..e0f15db2eb22b5d618150277e48b741f8fdd277a
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "java.configuration.updateBuildConfiguration": "automatic"
+}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..d986d777691fbe82ab581cb2a0c54c7546a8b5e1
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,42 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java project to get you started.
+ * For more details take a look at the Java Quickstart chapter in the Gradle
+ * User Manual available at https://docs.gradle.org/5.6.1/userguide/tutorial_java_projects.html
+ */
+
+plugins {
+    // Apply the java plugin to add support for Java
+    id 'java'
+
+    // Apply the application plugin to add support for building a CLI application
+    id 'application'
+}
+
+repositories {
+    // Use jcenter for resolving dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}
+
+dependencies {
+    // This dependency is used by the application.
+    implementation 'com.google.guava:guava:28.0-jre'
+
+    // Use JUnit Jupiter API for testing.
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
+
+    // Use JUnit Jupiter Engine for testing.
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
+}
+
+application {
+    // Define the main class for the application
+    mainClassName = 'io.ad.structs.App'
+}
+
+test {
+    // Use junit platform for unit tests
+    useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000000000000000000000000000000000000..490fda8577df6c95960ba7077c43220e5bb2c0d9
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000000000000000000000000000000000000..a4b4429748d92848a3d820c7b099fbeb941066ae
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000000000000000000000000000000000000..2fe81a7d95e4f9ad2c9b2a046707d36ceb3980b3
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  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 "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+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 or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; 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=`expr $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
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000000000000000000000000000000000000..62bd9b9ccefea2b65ae41e5d9a545e2021b90a1d
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,103 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@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 Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@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="-Xmx64m" "-Xms64m"
+
+@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
+
+: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=%*
+
+: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/settings.gradle b/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..c5d67fc013cd8df2cef45002d85ed532c157fc92
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,10 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/5.6.1/userguide/multi_project_builds.html
+ */
+
+rootProject.name = 'lists'
diff --git a/src/main/java/io/ad/structs/App.java b/src/main/java/io/ad/structs/App.java
new file mode 100644
index 0000000000000000000000000000000000000000..010d5418e047d17e31c72333ca040e1011c5c7dd
--- /dev/null
+++ b/src/main/java/io/ad/structs/App.java
@@ -0,0 +1,54 @@
+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package io.ad.structs;
+
+import java.util.ListIterator;
+
+public class App {
+   
+
+    public static void main(String[] args) {
+
+        //Try LinkedList with Iterator
+        LinkedList<Integer> list = new LinkedList<>();
+		list.add(0,1);
+		list.add(2);
+        list.add(3);
+        list.add(3,4);
+		
+		for (Integer i  : list)
+			System.out.println(i);
+		
+		
+
+        //Try Double-linked List with ListIterator
+        DoubleLinkedList<Integer> dlist = new DoubleLinkedList<>();
+		dlist.add(12);
+		dlist.add(13);
+		dlist.add(14);
+		System.out.println(dlist);
+		
+		dlist.remove(0);
+		System.out.println(dlist);
+		
+		ListIterator<Integer> it = dlist.listIterator();
+		
+		while(it.hasNext()) {
+			System.out.println("hasNext ?: "+it.hasNext());
+			System.out.println("hasPrev ?: "+it.hasPrevious());
+			System.out.println("NextIndex: "+it.nextIndex());
+			System.out.println("PrevIndex: "+it.previousIndex());
+			System.out.println("Next-----> "+it.next());;
+		}
+		
+		while(it.hasPrevious()) {
+			System.out.println("hasNext ?: "+it.hasNext());
+			System.out.println("hasPrev ?: "+it.hasPrevious());
+			System.out.println("NextIndex: "+it.nextIndex());
+			System.out.println("PrevIndex: "+it.previousIndex());
+			System.out.println("Previous->"+it.previous());
+		}
+		
+    }
+}
diff --git a/src/main/java/io/ad/structs/DoubleLinkedList.java b/src/main/java/io/ad/structs/DoubleLinkedList.java
new file mode 100644
index 0000000000000000000000000000000000000000..6ea147fea9c2b54d91bd741aa4bf9bdce3219ea0
--- /dev/null
+++ b/src/main/java/io/ad/structs/DoubleLinkedList.java
@@ -0,0 +1,254 @@
+package io.ad.structs;
+
+import java.util.Iterator;
+import java.util.ListIterator;
+import java.util.NoSuchElementException;
+
+
+
+public class DoubleLinkedList<E> implements List<E> {
+	private ListNode head;
+	private ListNode last;
+	private int size;
+
+	// ListNode as member inner class.
+	private class ListNode {
+		private ListNode next;
+		private ListNode prev;
+		private E data;
+
+		private ListNode(E data, ListNode prev, ListNode next) {
+			this.data = data;
+			this.next = next;
+			this.prev=prev;
+		}
+	}
+	// ---------------------------------
+
+	@Override
+	public boolean isEmpty() {
+		return head == null;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		if (element == null) {
+			throw new NullPointerException("elem must not be null");
+		}
+		if (index < 0) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (index >= size() + 1) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (index == 0) {
+			ListNode newHead = new ListNode(element, null, head);
+			head = newHead;
+			if (size()==0) last=newHead;
+			size++;
+			return;
+		}
+		if (index == size()) {
+			ListNode temp = new ListNode(element, last, null);
+			last.next=temp;
+			last=temp;
+			size++;
+			return;
+		}
+
+		ListNode temp = head;
+		for (int i = 0; i < index - 1; i++) {
+			temp = temp.next;
+		}
+		ListNode node = new ListNode(element, temp, temp.next);
+		temp.next.prev=node;
+		temp.next=node;
+		size++;
+	}
+
+	@Override
+	public void add(E elem) {
+		if (head == null) {
+			add(0, elem);
+
+		} else {
+			add(size, elem);
+		}
+	}
+
+	@Override
+	public int size() {
+		return size;
+	}
+
+	@Override
+	public E get(int index) {
+		if (index < 0) {
+			throw new IndexOutOfBoundsException();
+		}		
+		if (index >= size()) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (size() == 0) {
+			throw new NoSuchElementException();
+		}
+		if (index == size()-1) return last.data;
+		else {
+			ListNode temp = head;
+			for (int i = 0; i < index; i++) {
+				temp = temp.next;
+			}
+			return temp.data;
+		}
+	}
+
+	public void addFirst(E elem) {
+		add(0, elem);
+	}
+
+	public void addLast(E elem) {
+		add(size,elem);
+	}
+
+	public E getFirst() {
+		return get(0);
+	}
+
+	public E getLast() {
+		return get(size() - 1);
+	}
+
+	public String toString() {
+		ListNode temp = head;
+		StringBuilder sb = new StringBuilder("[");
+		while (temp != null) {
+			if(sb.length()!=1) sb.append(", ");
+			sb.append(temp.data);
+			temp = temp.next;
+		}
+		sb.append("]");
+		return sb.toString();
+	}
+
+	// Iterator as anonymous inner class
+
+	public Iterator<E> iterator() {
+		return new Iterator<E>() {
+			ListNode next = DoubleLinkedList.this.head;
+	        public boolean hasNext() {
+	           return next!=null;
+	        }
+	        public E next() {
+	           if (next==null) throw new NoSuchElementException();
+	           E value = next.data;
+	           next = next.next;
+	           return value;
+	        }
+	     };
+	}
+	
+	// ListIterator as anonymous inner class
+	public ListIterator<E> listIterator() {
+		return new ListIterator<E>() {
+			
+			private ListNode next = head;
+			private ListNode prev = null;
+			private int nextIndex = 0;
+
+			@Override
+			public boolean hasNext() {
+				return next!=null;
+			}
+
+			@Override
+			public E next() {
+				if (hasNext()) {
+					nextIndex++;
+					E data = next.data;
+					next=next.next;
+					if (prev==null) prev=head;
+					else prev=prev.next;
+					return data;
+				} else {
+					throw new NoSuchElementException();
+				}
+			}
+
+			@Override
+			public boolean hasPrevious() {				
+				return prev!=null;
+			}
+
+			@Override
+			public E previous() {
+				if (hasPrevious()) {
+					nextIndex--;
+					E data = prev.data;
+					prev=prev.prev;
+					if (next==null) next=last;
+					else next=next.prev;
+					return data;
+				} else {
+					throw new NoSuchElementException();
+				}
+			}
+
+			@Override
+			public int nextIndex() {
+				return nextIndex;
+			}
+
+			@Override
+			public int previousIndex() {
+				return nextIndex-1;
+			}
+
+			@Override
+			public void remove() {
+				throw new UnsupportedOperationException();
+				
+			}
+
+			@Override
+			public void set(E e) {
+				throw new UnsupportedOperationException();
+				
+			}
+
+			@Override
+			public void add(E e) {
+				throw new UnsupportedOperationException();
+				
+			}
+			
+		};
+		
+	}
+
+	@Override
+	public void remove(int index) {
+		if (index < 0) {
+			throw new IndexOutOfBoundsException();
+		}		
+		if (index >= size()) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (size() == 0) {
+			throw new NoSuchElementException();
+		}
+		if (index==0) {
+			head.next.prev=null;
+			head = head.next;
+			if (size()==1) last = null;
+		} else {
+			ListNode node = head;
+			for (int pos = 0; pos<index-1; pos++) {
+				node=node.next;
+			}
+			node.next.next.prev=node;
+			node.next = node.next.next;
+			
+		}
+		size--;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/io/ad/structs/LinkedList.java b/src/main/java/io/ad/structs/LinkedList.java
new file mode 100644
index 0000000000000000000000000000000000000000..d9333a13e15c6bd6b084cd1827bdc332762fdafe
--- /dev/null
+++ b/src/main/java/io/ad/structs/LinkedList.java
@@ -0,0 +1,164 @@
+package io.ad.structs;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+public class LinkedList<E> implements List<E> {
+	private ListNode head;
+	private ListNode last;
+	private int size;
+
+	// ListNode as member inner class.
+	private class ListNode {
+		private ListNode next;
+		private E data;
+
+		private ListNode(E data, ListNode next) {
+			setData(data);
+			setNext(next);
+		}
+
+		private void setData(E data) {
+			this.data = data;
+		}
+
+		private void setNext(ListNode next) {
+			this.next = next;
+		}
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return head == null;
+	}
+
+	@Override
+	public void add(int index, E element) {
+		if (element == null) {
+			throw new NullPointerException("elem must not be null");
+		}
+		if (index < 0) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (index >= size() + 1) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (index == 0) {
+			ListNode newHead = new ListNode(element, head);
+			head = newHead;
+			if (size()==0) last=head;
+			size++;
+			return;
+		}
+		if (index == size()) {
+			last.setNext(new ListNode(element, null));
+			last=last.next;	
+			size++;
+			return;
+		}
+
+		ListNode temp = head;
+		for (int i = 0; i < index-1; i++) {
+			temp = temp.next;
+		}
+		temp.setNext(new ListNode(element, temp.next));
+		size++;
+	}
+
+	@Override
+	public void add(E elem) {
+		add(size, elem);
+	}
+
+	@Override
+	public int size() {
+		return size;
+	}
+
+	@Override
+	public E get(int index) {
+		if (index < 0) {
+			throw new IndexOutOfBoundsException();
+		}		
+		if (index >= size()) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (size() == 0) {
+			throw new NoSuchElementException();
+		}
+		ListNode temp = head;
+		for (int i = 0; i < index; i++) {
+			temp = temp.next;
+		}
+		return temp.data;
+	}
+
+	public void addFirst(E elem) {
+		add(0, elem);
+	}
+
+	public void addLast(E elem) {
+		add(size,elem);
+	}
+
+	public E getFirst() {
+		return get(0);
+	}
+
+	public E getLast() {
+		return get(size() - 1);
+	}
+
+	public String toString() {
+		ListNode temp = head;
+		StringBuilder sb = new StringBuilder("[");
+		while (temp != null) {
+			if(sb.length()!=1) sb.append(", ");
+			sb.append(temp.data);
+			temp = temp.next;
+		}
+		sb.append("]");
+		return sb.toString();
+	}
+
+	// Iterator implemented with anonymous inner class
+
+	public Iterator<E> iterator() {
+		return new Iterator<E>() {
+			private ListNode next = LinkedList.this.head;
+	        public boolean hasNext() {
+	           return next!=null;
+	        }
+	        public E next() {
+	           if (next==null) throw new NoSuchElementException();
+	           E value = next.data;
+	           next = next.next;
+	           return value;
+	        }
+	     };
+	}
+
+	@Override
+	public void remove(int index) {
+		if (index < 0) {
+			throw new IndexOutOfBoundsException();
+		}		
+		if (index >= size()) {
+			throw new IndexOutOfBoundsException();
+		}
+		if (size() == 0) {
+			throw new NoSuchElementException();
+		}
+		if (index==0) {
+			head = head.next;
+		} else {
+			ListNode node = head;
+			for (int pos = 0; pos<index-1; pos++) {
+				node=node.next;
+			}
+			node.next = node.next.next;
+			if (index==size()-1) last=node;
+		}
+		size--;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/io/ad/structs/List.java b/src/main/java/io/ad/structs/List.java
new file mode 100644
index 0000000000000000000000000000000000000000..0d616ce3a4a493dc51b9c6f0e30450603c7492a1
--- /dev/null
+++ b/src/main/java/io/ad/structs/List.java
@@ -0,0 +1,11 @@
+package io.ad.structs;
+
+public interface List<E> extends Iterable<E> {
+
+	void add(E element);
+	void add(int index, E element);
+	int size();
+	void remove(int index);
+	E get(int index);
+	boolean isEmpty();    
+}