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Ben-MTPBen-MTP
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update file .gitignore, project java-collection
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‎Java-Collection/collection/.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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### VS Code ###
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.vscode/
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# Compiled class file
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*.class
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**/target/
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design/
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uml/
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api/file_upload/
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api/file_impact_data/
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api/tmp/
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# Log file
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*.log
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*.log.gz

‎Java-Collection/collection/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>collection</artifactId>
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<version>1.0</version>
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<properties>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>log4j</groupId>
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<artifactId>log4j</artifactId>
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<version>1.2.17</version>
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</dependency>
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</dependencies>
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</project>

‎Java-Collection/collection/src/main/java/com/collectiondemo/MainPerformance.java‎

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package com.collectiondemo;
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import org.apache.log4j.Logger;
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import java.util.ArrayList;
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import java.util.LinkedList;
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import java.util.List;
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/**
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* logger.info() --> System.out.println()
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* @author ManhKM on 2/14/2022
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* @project Java-Collection
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*/
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public class MainPerformance {
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static Logger logger = Logger.getLogger(MainPerformance.class);
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static int n = 100000;
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public static void main(String[] args) {
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arrayListVsLinkedList();
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}
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private static void arrayListVsLinkedList() {
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Integer[] array = new Integer[n];
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List arrayList = new ArrayList();
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List linkedList = new LinkedList();
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System.out.println("==== Add ====");
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long start = System.nanoTime();
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for (int i = 0; i < n; i++) {
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array[i] = i;
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}
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System.out.println("Array : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (int i = 0; i < n; i++) {
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arrayList.add(i);
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}
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System.out.println("ArrayList : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (int i = 0; i < n; i++) {
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linkedList.add(i);
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}
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System.out.println("LinkedList: " + (System.nanoTime() - start)/1000000.0 + " ms");
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System.out.println("==== Get ====");
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start = System.nanoTime();
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for (int i = 0; i < n; i++) {
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Integer x = array[i];
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}
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System.out.println("Array loop index : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (int i = 0; i < n; i++) {
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arrayList.get(i);
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}
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System.out.println("ArrayList loop index : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (int i = 0; i < n; i++) {
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linkedList.get(i);
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}
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System.out.println("LinkedList loop index : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (Object item : arrayList) {
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Object x = item;
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}
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System.out.println("ArrayList loop interator : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (Object item : linkedList) {
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Object x = item;
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}
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System.out.println("LinkedList loop interator: " + (System.nanoTime() - start)/1000000.0 + " ms");
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System.out.println("==== Remove ====");
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start = System.nanoTime();
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for (int i = 9999; i >=0; i--) {
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arrayList.remove(i);
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}
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System.out.println("ArrayList : " + (System.nanoTime() - start)/1000000.0 + " ms");
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start = System.nanoTime();
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for (int i = 9999; i >=0; i--) {
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linkedList.remove(i);
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}
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System.out.println("LinkedList: " + (System.nanoTime() - start)/1000000.0 + " ms");
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}
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}

‎Java-Collection/readme.md‎

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