first commit

Author: AAdewunmi

.gitignore

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+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+
+# Created by https://www.gitignore.io/api/git,java,maven,eclipse,windows
+
+### 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/
+
+### Git ###
+# Created by git for backups. To disable backups in Git:
+# $ git config --global mergetool.keepBackup false
+*.orig
+
+# Created by git when using merge tools for conflicts
+*.BACKUP.*
+*.BASE.*
+*.LOCAL.*
+*.REMOTE.*
+*_BACKUP_*.txt
+*_BASE_*.txt
+*_LOCAL_*.txt
+*_REMOTE_*.txt
+
+### 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*
+
+### 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
+.mvn/wrapper/maven-wrapper.jar
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Some additional ignores (sort later)
+*.DS_Store
+*.sw?
+.#*
+*#
+*~
+.classpath
+.project
+.settings
+bin
+build
+target
+dependency-reduced-pom.xml
+*.sublime-*
+/scratch
+.gradle
+README.html
+*.iml
+.idea
+.exercism

ArrayList/ArrayList_Tutorial.java

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+package ArrayList;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArrayList_Tutorial {
+    public static void main(String[] args) {
+        List<Integer> numberList = new ArrayList<>();
+        numberList.add(10);
+        numberList.add(20);
+        numberList.add(30);
+        numberList.add(40);
+        System.out.println(numberList);
+        System.out.println(findNumber(numberList, 30));
+        System.out.println(deleteNumber(numberList, 30));
+        System.out.println(numberList);
+        System.out.println(insertNumber(numberList, 40));
+        System.out.println(numberList);
+    }
+
+    // Accessing elements if statement // .get() // arraylist if.contains // object for if.equals
+    // arrayList.indexOf
+    public static boolean findNumber(List<Integer> numberList, int numb){
+            if (numberList.contains(numb)) {
+                return true;
+            }
+        return false;
+    }
+    public static boolean deleteNumber(List<Integer> numberList, int numb){
+            if (numberList.contains(numb)) {
+                numberList.remove(numberList.indexOf(numb));
+                return true;
+            }
+        return false;
+    }
+
+    private static boolean insertNumber(List<Integer> numberList, int numb) {
+            if (!(numberList.contains(numb))) {
+                numberList.add(numb);
+                return true;
+            }
+        return false;
+    }
+}