Ryan Gonzalez rmg007

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Software Engineer

rmg007 / SortListUsingComparatorNullsLast.java

Last active October 16, 2022 14:08

Sort List Using Comparator Nulls Last

	import java.util.ArrayList;
	import java.util.Comparator;
	import java.util.List;

	public class SortListUsingComparatorNullsLast {
	public static void main(String[] args) {
	List<Integer> list = new ArrayList<>(){{
	add(6);
	add(null);
	add(8);

rmg007 / SortListUsingComparatorReverseOrder.java

Created October 16, 2022 13:52

Sort Lis tUsing Comparato rReverse Order

	import java.util.ArrayList;
	import java.util.Comparator;
	import java.util.List;

	public class SortListUsingComparatorReverseOrder {
	public static void main(String[] args) {
	List<Integer> list = new ArrayList<>(List.of(3, 6, 8, 2));
	list.sort(Comparator.reverseOrder());

	System.out.println(list);//output [8, 6, 3, 2]

rmg007 / SortListUsingComparatorNaturalOrder.java

Created October 16, 2022 13:51

Sort List using Comparator NaturalOrder

	import java.util.ArrayList;
	import java.util.Comparator;
	import java.util.List;

	public class SortListUsingComparatorNaturalOrder {
	public static void main(String[] args) {
	List<Integer> list = new ArrayList<>(List.of(3, 6, 8, 2));
	list.sort(Comparator.naturalOrder());

	System.out.println(list);//output [2, 3, 6, 8]

rmg007 / IteratingOverList.java

Created October 12, 2022 15:18

iterating over list in java

	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.List;
	import java.util.ListIterator;

	public class IteratingOverList {
	public static void main(String[] args) {


	List<String> list = new ArrayList<>(){{

rmg007 / RemoveElementsFromList.java

Created October 12, 2022 14:57

Remove Elements From List

	import java.util.ArrayList;
	import java.util.List;

	public class RemoveElementsFromList {
	public static void main(String[] args) {
	List<String> list = new ArrayList<>(List.of("java","is", "is", "awesome"));

	// remove element at index 2
	list.remove(2);

rmg007 / UpdateElementsInList.java

Created October 12, 2022 14:33

Update elements in a list

	import java.util.ArrayList;
	import java.util.List;

	public class UpdateElementsInList {
	public static void main(String[] args) {
	List<Integer> intList = new ArrayList<>(List.of(1, 2, 3));

	// all elements will be updated
	// output: [2, 4, 6]
	intList.replaceAll(e -> e * 2);

rmg007 / FindingElementInList.java

Created October 12, 2022 14:18

Finding and Accessing elements in a List

	import java.util.ArrayList;
	import java.util.List;

	public class FindingElementInList {
	public static void main(String[] args) {
	List<Integer> list1 = new ArrayList<>(List.of(6, 1, 2, 3, 4, 5, 6));
	List<Integer> list2 = new ArrayList<>(List.of(1, 2, 3));

	// output: contains 1: true
	System.out.println("contains 1: " + list1.contains(1));

rmg007 / ListInterfaceAddElements.java

Last active October 12, 2022 13:45

add methods in list interface

	import java.util.ArrayList;
	import java.util.List;

	public class ListInterfaceAddElements {

	public static void main(String[] args) {

	List<Integer> list = new ArrayList<>();
	list.add(1);
	list.add(3);

rmg007 / CollectionInterfaceMethodsToPerformSetOperations.java

Created October 11, 2022 14:56

set operations using containsAll addAll removeAll retainAll

	import java.util.Collection;
	import java.util.HashSet;
	import java.util.Set;

	public class CollectionInterfaceMethodsToPerformSetOperations {
	static Collection<Integer> firstSet = new HashSet<>(Set.of(1, 2, 3, 4, 5, 6));
	static Collection<Integer> secondSet = new HashSet<>(Set.of(4, 5, 6, 7, 8, 9));
	static Collection<Integer> smallSet = new HashSet<>(Set.of(1, 2, 3));

	public static void subSet(){

rmg007 / CollectionInterfaceTraversalMethods.java

Created October 11, 2022 14:43

Traversing elements in the collection interface

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.Iterator;
	import java.util.List;

	public class CollectionInterfaceTraversalMethods {
	public static void main(String[] args) {

	Collection<Integer> collection1 = new ArrayList<>(List.of(1, 2, 3, 4, 5, 6));