Java/java-list-map/src/main/java/com/hmkcode/ListApp.java at master · yunfulee/Java · GitHub

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package com.hmkcode;

import java.util.ArrayList;

import java.util.Collections;

import java.util.LinkedList;

import java.util.List;

import com.hmkcode.vo.Person;

public class ListApp

{

public static void main( String[] args )

{

// ( 1 ) List

// A. Initiate

List<Person> arrayList = new ArrayList<Person>();

List<Person> linkedList = new LinkedList<Person>();

// B. Populate

for(Person person:getPersons()){

arrayList.add(person);

linkedList.add(person);

}

// --> print

System.out.println("--------- Print All -------------");

System.out.println("ArrayList: "+arrayList);

System.out.println("LinkedList: "+linkedList);

// C. Iterate

System.out.println("--------- Print Iterate by index -------------");

for(int i = 0; i < linkedList.size(); i++){

System.out.println("LinkedList[ "+i+" ]"+linkedList.get(i));

}

System.out.println("--------- Print Iterate by for each -------------");

//this is an efficient way to iterate

for(Person person:linkedList){

System.out.println("LinkedList: "+person);

}

// D. Sort

Collections.sort(linkedList);

// --> print

System.out.println("--------- Print Sorted List -------------");

System.out.println("Sorted LinkedList: "+linkedList);

}

private static Person[] getPersons(){

Person[] persons = new Person[5];

persons[0] = new Person("Brit", 29);

persons[1] = new Person("John", 32);

persons[2] = new Person("Jack", 27);

persons[3] = new Person("Jenifer", 24);

persons[4] = new Person("Brit", 37);

return persons;

}

Java/java-list-map/src/main/java/com/hmkcode/ListApp.java at master · yunfulee/Java · GitHub

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