Collections Tutorials - Memorynotfound

May 30, 2017

Initialization of an ArrayList in one line example

This tutorials demonstrates how to initialize a list or arraylist in one line in different ways. The traditional way to create and initialize an ArrayList is: List<String> planets = new ArrayList<String>(); planets.add(“Earth”); planets.add(“Mars”); planets.add(“Venus”);...

Collections / Java

February 1, 2015

Sorted Set Example – Ascending or Descending by comparator

In this Sorted Set example we show you how you can sort a java.util.Set in ascending or descending order using a java.util.TreeSet. The java.util.TreeSet sorts the entries in natural order, which means that all...

Collections / Java

February 1, 2015

Sorted Map Example – By Value or By Key or By Comparator

In this Sorted Map Example we will show how you can sort a java.util.Map using the java.util.TreeMap Class. We can sort collections in Ascending or Descending order by key or value. We also show...

Collections / Java

February 1, 2015

Sorted List Example – Simple Reverse and Comparable Sort

In this Sorted List Example we will show how you can sort a java.util.List using the java.util.Collections Class. We can sort collections in Ascending or Descending order. We also show you how you can...

Collections / Java

November 26, 2014

Different Ways to Iterate over a Map in Java

Map<k, v> A Map has Set of key value pairs. One key refers to only one value as such a map cannot contain duplicate keys. package com.memorynotfound.collections.map; import java.util.HashMap; import java.util.Iterator; import java.util.Map; /** * @author MemoryNotFound.com...

Collections / Java

November 26, 2014

Different Ways to Iterate over a Set in Java

Iterate over a Set A Set is a Collection that cares about uniqueness, it doesn’t allow duplicate elements. The .equals() method determines whether two objects are identical in witch case only one object can be...

Collections / Java

November 6, 2014

Different ways to Iterate over an ArrayList in Java

ArrayList ArrayList is a collection that is ordered by index. This means that when you add elements to the ArrayList the order of the list is determined by insertion order. Lists are zero based this...

Category: Collections

Initialization of an ArrayList in one line example

Sorted Set Example – Ascending or Descending by comparator

Sorted Map Example – By Value or By Key or By Comparator

Sorted List Example – Simple Reverse and Comparable Sort

Different Ways to Iterate over a Map in Java

Different Ways to Iterate over a Set in Java

Different ways to Iterate over an ArrayList in Java

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