diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000000..20c0521cc7
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,46 @@
+plugins {
+    id 'java'
+    id 'application'
+    id 'checkstyle'
+    id 'com.github.johnrengelman.shadow' version '5.1.0'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.5.0'
+    testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine', version: '5.5.0'
+}
+
+test {
+    useJUnitPlatform()
+
+    testLogging {
+        events "passed", "skipped", "failed"
+
+        showExceptions true
+        exceptionFormat "full"
+        showCauses true
+        showStackTraces true
+        showStandardStreams = false
+    }
+}
+
+application {
+    mainClassName = "seedu.duke.Duke"
+}
+
+shadowJar {
+    archiveBaseName = "duke"
+    archiveClassifier = null
+}
+
+checkstyle {
+    toolVersion = '8.29'
+}
+
+run{
+    standardInput = System.in
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000000..f3d88b1c2f
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 0000000000..b7c8c5dbf5
--- /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-6.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000000..2fe81a7d95
--- /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 0000000000..62bd9b9cce
--- /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/src/main/java/Deadlines.java b/src/main/java/Deadlines.java
new file mode 100644
index 0000000000..26b601f76f
--- /dev/null
+++ b/src/main/java/Deadlines.java
@@ -0,0 +1,33 @@
+/**
+ * Deadlines is a task that have a deadline which is a string.
+ * @author Dominic Siew Zhen Yu
+ *
+ */
+
+public class Deadlines extends Task{
+    private String deadline;
+    String TASKINDICATOR = "[D]";
+
+    /**
+     * The constructor for the Deadlines class with the userInput (which refers to the name of the task)
+     * and the deadline parameter which is the deadline of the deadlines task.
+     *
+     * @param userInput the name of the deadlines
+     * @param deadline the time you have to complete the Deadlines
+     */
+
+    public Deadlines(String userInput, String deadline) {
+        super(userInput);
+        this.deadline = deadline;
+    }
+
+    /**
+     * the printName() method prints the name of the deadlines task.
+     *
+     * @return the string representation of the deadlines
+     */
+
+    public String printName() {
+        return TASKINDICATOR + " " + super.printName() + " (by: " + this.deadline + " )";
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
index 5d313334cc..565de75a12 100644
--- a/src/main/java/Duke.java
+++ b/src/main/java/Duke.java
@@ -1,10 +1,137 @@
+/**
+ * Duke is a chatbot that takes in tasks, which includes todos, deadlines and events, and compiles them
+ * in a list. Tasks can be removed from the list and be marked as completed.
+ *
+ * @author Dominic Siew Zhen Yu
+ *
+ */
+
+import java.io.*;
+import java.util.Scanner;
+
 public class Duke {
-    public static void main(String[] args) {
-        String logo = " ____        _        \n"
-                + "|  _ \\ _   _| | _____ \n"
+
+    public enum Tasks {
+        DEADLINE,
+        EVENT,
+        TODO
+    }
+
+    public static void main(String[] args) throws IOException {
+        String logo = " ____        _\n"
+                + "|  _ \\ _   _| | _____\n"
                 + "| | | | | | | |/ / _ \\\n"
                 + "| |_| | |_| |   <  __/\n"
                 + "|____/ \\__,_|_|\\_\\___|\n";
         System.out.println("Hello from\n" + logo);
+        System.out.println("____________________________________________________________\nHello! I'm Duke\nWhat can I do for you?\n____________________________________________________________");
+
+        boolean isEnded = false;
+        List taskList = null;
+        taskList = new List();
+
+        File file = new File("src/main/memory.txt");
+
+        if (!(file.exists())){
+            System.out.println("processing!");
+            try {
+                PrintWriter writer = new PrintWriter("src/main/memory.txt");
+                writer.print("");
+                writer.close();
+
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        } else {
+
+
+
+            File updated = new File("src/main/updated.txt");
+            BufferedReader reader = new BufferedReader(new FileReader("src/main/memory.txt"));
+            BufferedWriter writer = new BufferedWriter(new FileWriter(updated));
+            String currentLine = "";
+            int numberAdded = 1;
+
+
+
+            while ((currentLine = reader.readLine()) != null) {
+                String[] seperate1 = currentLine.toString().split(" ", 2);
+                String taskTypeText = seperate1[0];
+                String taskType;
+
+                String[] seperate2 = seperate1[1].toString().split(" ", 2);
+                boolean isCompleted = (seperate2[0].equals("[✓]"))? true: false;
+                String eventInfo = seperate2[1];
+
+                switch(taskTypeText) {
+                    case "[T]":
+                        String eventname = eventInfo;
+                        taskList.addTodo(eventname, false);
+                        break;
+                    case "[D]":
+                        String[] seperateAgain = seperate2[1].split(" \\(by: ", 2);
+                        String eventName = seperateAgain[0];
+                        String deadline = seperateAgain[1].split(" ", 2)[0];
+                        taskList.addDeadline(eventName, deadline, false);
+                        break;
+                    case "[E]":
+                        String[] seperateAgaining = seperate2[1].split(" \\(at: ", 2);
+                        String event = seperateAgaining[0];
+                        String timeline = seperateAgaining[1].split(" ", 2)[0];
+                        taskList.addDeadline(event, timeline, false);
+                        break;
+                }
+
+                if (isCompleted){
+                    taskList.updateTaskStatus(numberAdded, false);
+                }
+                numberAdded++;
+            }
+
+        }
+
+
+
+
+        Scanner sc= new Scanner(System.in);
+
+        while(!isEnded) {
+            String userInput = sc.nextLine();
+            System.out.println("____________________________________________________________");
+            String[] parsedInput = userInput.split(" ", 2);
+
+
+            if (parsedInput[0].equals("todo")) {
+                if (parsedInput.length == 1 ) {
+                    throw new DukeException("empty");
+                }
+                taskList.addTodo(parsedInput[1], true);
+
+            } else if (parsedInput[0].equals("deadline")) {
+                String[] furtherParsed = parsedInput[1].split(" /by ", 2);
+                taskList.addDeadline(furtherParsed[0], furtherParsed[1], true);
+            } else if (parsedInput[0].equals("event")){
+                String[] furtherParsed = parsedInput[1].split(" /at ",2);
+                taskList.addEvent(furtherParsed[0],furtherParsed[1], true);
+            } else if(userInput.equals("bye")){
+                System.out.println("Bye. Hope to see you again soon!");
+                isEnded = true;
+            } else if (userInput.equals("list")){
+                taskList.printList();
+            } else if (parsedInput[0].equals("done")) {
+                int itemRank = Integer.parseInt(parsedInput[1]);
+                taskList.updateTaskStatus(itemRank, true);
+
+            } else if (parsedInput[0].equals("remove")){
+                int itemRank = Integer.parseInt(parsedInput[1]);
+                taskList.removeTask(itemRank - 1 );
+            } else {
+                System.out.println("Please give an appropriate response.");
+                throw new DukeException("generic");
+            }
+            System.out.println("____________________________________________________________");
+        }
+
+
     }
 }
diff --git a/src/main/java/DukeException.java b/src/main/java/DukeException.java
new file mode 100644
index 0000000000..73e6ea831c
--- /dev/null
+++ b/src/main/java/DukeException.java
@@ -0,0 +1,32 @@
+/**
+ * DukeException is an ArrayIndexOutOfBoundsException that are caused by errors in the Duke program.
+ */
+public class DukeException extends ArrayIndexOutOfBoundsException {
+    private String cause;
+
+    /**
+     * this is a constructor for the DukeException class; it contains a message parameter
+     * that specifies the error message to be displayed.
+     *
+     * @param message a String that is used to specify the error message to be produced
+     */
+
+    DukeException(String message) {
+        this.cause = message;
+    }
+
+    /**
+     * the toString() method of the class that returns a string representation of the
+     * error produced in the program Duke.
+     *
+     * @return a string representation of the error produced
+     */
+    @Override
+    public String toString() {
+        if (this.cause.equals("empty")) {
+            return "OOPS!!! The description of a todo cannot be empty.";
+        } else {
+            return "OOPS!!! I'm sorry, but I don't know what that means :-(";
+        }
+    }
+}
diff --git a/src/main/java/Event.java b/src/main/java/Event.java
new file mode 100644
index 0000000000..a9bdb81d6a
--- /dev/null
+++ b/src/main/java/Event.java
@@ -0,0 +1,29 @@
+/**
+ * Events are tasks that have a timeline.
+ *
+ * @author Dominic Siew Zhen Yu
+ */
+public class Event extends Task{
+    private String timeline;
+    String TASKINDICATOR = "[E]";
+
+    /**
+     * The constructor of the events class.
+     *
+     * @param userInput the name of the task
+     * @param timeline the period of which the event is taking place
+     */
+    public Event(String userInput, String timeline) {
+        super(userInput);
+        this.timeline = timeline;
+    }
+
+    /**
+     * printName() method returns the name and the task indicator of the Event object.
+     *
+     * @return a string representation of a Event object
+     */
+    public String printName() {
+        return TASKINDICATOR + " " + super.printName() + " (at: " + this.timeline + " )";
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/List.java b/src/main/java/List.java
new file mode 100644
index 0000000000..d22f664565
--- /dev/null
+++ b/src/main/java/List.java
@@ -0,0 +1,219 @@
+
+/**
+ * List refers to a task list that is used in the Duke program.
+ * An List object contains the tasks and several methods that work on the task.
+ *
+ * @author Dominic Siew Zhen Yu
+ */
+
+import java.io.*;
+import java.util.ArrayList;
+
+public class List {
+    private ArrayList<Task> taskList;
+    private FileWriter taskFile;
+    private boolean isFirstTimeOpening;
+
+    /**
+     * The constructor for the List class that instantiates a List object.
+     */
+
+    public List() throws IOException {
+        this.taskList = new ArrayList<Task>();
+        File file = new File("src/main/memory.txt");
+//        System.out.println(file.exists());
+//        if (!(file.exists())){
+//            PrintWriter writer = new PrintWriter("src/main/memory.txt");
+//            writer.print("");
+//            writer.close();
+//        } else {
+    }
+
+    /**
+     * the addTask() places generic tasks into the list (which was used in level 1-3).
+     *
+     * @param userInput
+     */
+
+    public void addTask(String userInput) {
+        taskList.add(new Task(userInput));
+    }
+
+    /**
+     * the printList() method prints out the String representation of the tasks
+     * in the List object.
+     */
+
+    public void printList() {
+        int numb = 1;
+        System.out.println("Here are the tasks in your list:");
+        for(Task task: taskList) {
+            System.out.println(numb + ". " + task.printName());
+            numb++;
+        }
+    }
+
+    /**
+     * the updateTaskStatus() method marks a task to be as completed.
+     *
+     * @param userInput the rank of the task in a list
+     */
+
+    public void updateTaskStatus(int userInput, boolean isInput) {
+        if (userInput > taskList.size()) {
+            System.out.println("please enter a number that's between 1 and " + taskList.size());
+            return ;
+        }
+        Task task = taskList.get(userInput - 1);
+
+        String lineToRemove = task.printName();
+        task.toggleComplete();
+
+        if (isInput) {
+            System.out.println("Nice! I've marked this task as done:");
+            System.out.println(task.printName());
+
+            try {
+                File input = new File("src/main/memory.txt");
+                File updated = new File("src/main/updated.txt");
+
+                BufferedReader reader = new BufferedReader(new FileReader(input));
+                BufferedWriter writer = new BufferedWriter(new FileWriter(updated));
+
+                String currentLine = "";
+
+                while ((currentLine = reader.readLine()) != null) {
+
+                    if (currentLine.equals(lineToRemove)) {
+                        writer.write(task.printName() + "\n");
+                        continue;
+                    }
+                    writer.write(currentLine + "\n");
+                }
+                writer.close();
+                reader.close();
+
+                boolean successful = updated.renameTo(input);
+
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+
+    }
+
+    /**
+     * the addTodo() method adds todos task into the list object
+     *
+     * @param userInput the name of the todo task
+     */
+
+    public void addTodo(String userInput, boolean isInput) {
+        Task task = new Todos(userInput);
+        taskList.add(task);
+
+        if (isInput) {
+            System.out.println("Got it. I've added this task:");
+            System.out.println(task.printName());
+            System.out.println("Now you have " + taskList.size() + " tasks in the list.");
+            try {
+                FileWriter fw = new FileWriter("src/main/memory.txt", true);
+                fw.write(task.printName() + "\n");
+                fw.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        } else {
+
+        }
+
+    }
+    /**
+     * the addEvent() method adds Events task into the list object.
+     *
+     * @param name the name of the event
+     * @param timeline the period that the event is taking place
+     */
+    public void addEvent(String name, String timeline, boolean isInput) {
+        Task task = new Event(name, timeline);
+        taskList.add(task);
+        if (isInput) {
+            System.out.println("Got it. I've added this task:");
+            System.out.println(task.printName());
+            System.out.println("Now you have " + taskList.size() + " tasks in the list.");
+
+            try {
+                FileWriter fw = new FileWriter("src/main/memory.txt", true);
+                fw.write(task.printName() + "\n");
+                fw.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+
+    }
+    /**
+     * the addDeadline() method adds Events task into the list object.
+     *
+     * @param name the name of the deadline
+     * @param deadline the deadline of the deadline task
+     */
+    public void addDeadline(String name, String deadline, boolean isInput) {
+        Task task = new Deadlines(name, deadline);
+        taskList.add(task);
+
+        if (isInput) {
+            System.out.println("Got it. I've added this task:");
+            System.out.println(task.printName());
+            System.out.println("Now you have " + taskList.size() + " tasks in the list.");
+            try {
+                FileWriter fw = new FileWriter("src/main/memory.txt", true);
+                fw.write(task.printName() + "\n");
+                fw.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+    /**
+     * the removeTask() method removes the task from the list object.
+     *
+     * @param userInput the rank of the task in a list
+     */
+    public void removeTask(int userInput) {
+        Task task = taskList.get(userInput);
+        System.out.println("Noted. I've removed the task:");
+        System.out.println(task.printName());
+        taskList.remove(userInput);
+        System.out.println("Now you have " + taskList.size() + " tasks in the list.");
+
+        String lineToRemove = task.printName();
+
+        try {
+            File input = new File("src/main/memory.txt");
+            File updated = new File("src/main/updated.txt");
+
+            BufferedReader reader = new BufferedReader(new FileReader(input));
+            BufferedWriter writer = new BufferedWriter(new FileWriter(updated));
+
+            String currentLine = "";
+
+            while ((currentLine = reader.readLine()).equals(null)) {
+
+                if (currentLine.equals(lineToRemove)) {
+                    continue;
+                }
+                writer.write(currentLine + "\n");
+            }
+            writer.close();
+            reader.close();
+
+            boolean successful = updated.renameTo(input);
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+}
diff --git a/src/main/java/Task.java b/src/main/java/Task.java
new file mode 100644
index 0000000000..f917dc1a71
--- /dev/null
+++ b/src/main/java/Task.java
@@ -0,0 +1,45 @@
+/**
+ * Task are work that has a name (that's a string) and a boolean which is true when a task is completed.
+ *
+ * @author Dominic Siew Zhen Yu
+ */
+public class Task {
+    private String name;
+    private boolean completed;
+
+    private String COMPLETED = "[✓]";
+    private String UNCOMPLETED = "[✕]";
+
+    /**
+     * the constructor of the Task class.
+     *
+     * @param name the name of the task
+     */
+
+    public Task(String name) {
+        this.name = name;
+        completed = false;
+    }
+
+    /**
+     * printName() method returns the name of the Task object, and whether the task is completed or not.
+     *
+     * @return a string representation of a Task object
+     */
+
+    public String printName() {
+        String completionStatus = completed? COMPLETED: UNCOMPLETED;
+        return completionStatus + " " + this.name;
+    }
+
+    /**
+     * the toggleComplete() method toggles the boolean "completed" when the task is completed,
+     * or if the user wishes to indicate that a task is incompleted if it is indicated as
+     * otherwise.
+     *
+     */
+
+    public void toggleComplete() {
+        completed = !completed;
+    }
+}
diff --git a/src/main/java/Todos.java b/src/main/java/Todos.java
new file mode 100644
index 0000000000..3b46b44dc5
--- /dev/null
+++ b/src/main/java/Todos.java
@@ -0,0 +1,29 @@
+/**
+ * Todos are generic tasks, with a "Todo" indicator.
+ *
+ * @author Dominic Siew Zhen Yu
+ */
+public class Todos extends Task{
+    String TASKINDICATOR = "[T]";
+
+    /**
+     * the constructor of the Todos object
+     *
+     * @param userInput the name of the object
+     */
+
+    public Todos (String userInput) {
+        super(userInput);
+    }
+
+    /**
+     * printName() method returns the name of the Todos object, and an indication that it
+     * is a todos task.
+     *
+     * @return a string representation of a Task object
+     */
+
+    public String printName() {
+        return TASKINDICATOR + " " + super.printName();
+    }
+}
\ No newline at end of file
diff --git a/src/main/memory.txt b/src/main/memory.txt
new file mode 100644
index 0000000000..00ae5715e5
--- /dev/null
+++ b/src/main/memory.txt
@@ -0,0 +1,5 @@
+[T] [✓] homework
+[D] [✕] yay (by: yay )
+[T] [✕] helo me
+[T] [✕] i hate cs
+[D] [✕] help (by: today )
diff --git a/src/main/updated.txt b/src/main/updated.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/text-ui-test/EXPECTED.TXT b/text-ui-test/EXPECTED.TXT
index 657e74f6e7..99d638f1a9 100644
--- a/text-ui-test/EXPECTED.TXT
+++ b/text-ui-test/EXPECTED.TXT
@@ -1,7 +1,49 @@
 Hello from
- ____        _        
-|  _ \ _   _| | _____ 
+ ____        _lis
+|  _ \ _   _| | _____
 | | | | | | | |/ / _ \
 | |_| | |_| |   <  __/
 |____/ \__,_|_|\_\___|
 
+____________________________________________________________
+Hello! I'm Duke
+What can I do for you?
+____________________________________________________________
+____________________________________________________________
+Got it. I've added this task:
+[T][UNCOMPLETED]meeting
+Now you have 1 tasks in the list.
+____________________________________________________________
+____________________________________________________________
+Got it. I've added this task:
+[D][UNCOMPLETED]application(by: 4th August)
+Now you have 2 tasks in the list.
+____________________________________________________________
+____________________________________________________________
+Got it. I've added this task:
+[E][UNCOMPLETED]carnival(at: January 4-5pm)
+Now you have 3 tasks in the list.
+____________________________________________________________
+____________________________________________________________
+Here are the tasks in your list:
+1. [T][UNCOMPLETED]meeting
+2. [D][UNCOMPLETED]application(by: 4th August)
+3. [E][UNCOMPLETED]carnival(at: January 4-5pm)
+____________________________________________________________
+____________________________________________________________
+Noted. I've removed the task:
+[E][UNCOMPLETED]carnival(at: January 4-5pm)
+Now you have 2 tasks in the list.
+____________________________________________________________
+____________________________________________________________
+Here are the tasks in your list:
+1. [T][UNCOMPLETED]meeting
+2. [D][UNCOMPLETED]application(by: 4th August)
+____________________________________________________________
+____________________________________________________________
+Nice! I've marked this task as done:
+[D][COMPLETED]application(by: 4th August)
+____________________________________________________________
+____________________________________________________________
+Bye. Hope to see you again soon!
+____________________________________________________________
diff --git a/text-ui-test/input.txt b/text-ui-test/input.txt
index e69de29bb2..2c21dbaa64 100644
--- a/text-ui-test/input.txt
+++ b/text-ui-test/input.txt
@@ -0,0 +1,8 @@
+todo meeting
+deadline application /by 4th August
+event carnival /at January 4-5pm
+list
+remove 3
+list
+done 2
+bye
\ No newline at end of file
diff --git a/text-ui-test/runtest.sh b/text-ui-test/runtest.sh
old mode 100644
new mode 100755
index e169618a34..c9ec870033
--- a/text-ui-test/runtest.sh
+++ b/text-ui-test/runtest.sh
@@ -13,7 +13,7 @@ then
 fi
 
 # compile the code into the bin folder, terminates if error occurred
-if ! javac -cp ../src -Xlint:none -d ../bin ../src/main/java/Duke.java
+if ! javac -cp ../src/main/java -Xlint:none -d ../bin ../src/main/java/*.java
 then
     echo "********** BUILD FAILURE **********"
     exit 1