Java/ArrayListExample.java at master · MarkusLahr78/Java · GitHub

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import java.util.*;

import java.util.ArrayList;

public class ArrayListExample {

public static void main(String args[]) {

// Creating an empty array list

ArrayList<String> list = new ArrayList<String>();

// Adding items to arrayList

list.add("Item1");

list.add("Item2");

list.add(2, "Item3"); // it will add Item3 to the third position of

// array list

list.add("Item4");

// Display the contents of the array list

System.out.println("The arraylist contains the following elements: "

+ list);

// Checking index of an item

int pos = list.indexOf("Item2");

System.out.println("The index of Item2 is: " + pos);

// Checking if array list is empty

boolean check = list.isEmpty();

System.out.println("Checking if the arraylist is empty: " + check);

// Getting the size of the list

int size = list.size();

System.out.println("The size of the list is: " + size);

// Checking if an element is included to the list

boolean element = list.contains("Item5");

System.out

.println("Checking if the arraylist contains the object Item5: "

+ element);

// Getting the element in a specific position

String item = list.get(0);

System.out.println("The item is the index 0 is: " + item);

// Retrieve elements from the arraylist

// 1st way: loop using index and size list

System.out

.println("Retrieving items with loop using index and size list");

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

System.out.println("Index: " + i + " - Item: " + list.get(i));

}

// 2nd way:using foreach loop

System.out.println("Retrieving items using foreach loop");

for (String str : list) {

System.out.println("Item is: " + str);

}

// 3rd way:using iterator

// hasNext(): returns true if there are more elements

// next(): returns the next element

System.out.println("Retrieving items using iterator");

for (Iterator<String> it = list.iterator(); it.hasNext();) {

System.out.println("Item is: " + it.next());

}

// Replacing an element

list.set(1, "NewItem");

System.out.println("The arraylist after the replacement is: " + list);

// Removing items

// removing the item in index 0

list.remove(0);

// removing the first occurrence of item "Item3"

list.remove("Item3");

System.out.println("The final contents of the arraylist are: " + list);

// Converting ArrayList to Array

String[] simpleArray = list.toArray(new String[list.size()]);

System.out.println("The array created after the conversion of our arraylist is: "

+ Arrays.toString(simpleArray));

}

Java/ArrayListExample.java at master · MarkusLahr78/Java · GitHub

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