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Commit d6cd880

Browse files
author
Rajeev Kumar Singh
committed
LinkedList and LinkedHashMap
1 parent d8dab44 commit d6cd880

20 files changed

+342
-19
lines changed

‎Readme.md‎

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@@ -2,10 +2,14 @@
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1. [Java ArrayList Tutorial with Examples](https://www.callicoder.com/java-arraylist/)
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5-
2. [Java HashMap Tutorial with Examples](https://www.callicoder.com/java-hashmap/)
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2. [Java LinkedList Tutorial with Examples](https://www.callicoder.com/java-linkedlist/)
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7-
3. [Java HashSet Tutorial with Examples](https://www.callicoder.com/java-hashset/)
7+
3. [Java HashMap Tutorial with Examples](https://www.callicoder.com/java-hashmap/)
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9-
4. [Java TreeMap Tutorial with Examples](https://www.callicoder.com/java-treemap/)
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4. [Java LinkedHashMap Tutorial with Examples](https://www.callicoder.com/java-linkedhashmap/)
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5. [Java TreeSet Tutorial with Examples](https://www.callicoder.com/java-treeset/)
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5. [Java TreeMap Tutorial with Examples](https://www.callicoder.com/java-treemap/)
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13+
6. [Java HashSet Tutorial with Examples](https://www.callicoder.com/java-hashset/)
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7. [Java TreeSet Tutorial with Examples](https://www.callicoder.com/java-treeset/)

‎java-arraylist-examples/src/ArrayListSortExample.java‎

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@@ -20,7 +20,7 @@ public int compare(String name1, String name2) {
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}
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});
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// The above `sort()` method call can also be written simply using lambda expressions
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// The above `sort()` method call can also be written simply using lambda expression
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names.sort((name1, name2) -> name1.compareTo(name2));
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// Following is an even more concise solution

‎java-arraylist-examples/src/RemoveElementsFromArrayListExample.java‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -19,11 +19,12 @@ public static void main(String[] args) {
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programmingLanguages.remove(5);
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System.out.println("After remove(5): " + programmingLanguages);
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22-
// Remove the element "Kotlin" (The remove() method returns false if the element does not exist in the ArrayList)
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// Remove the first occurrence of the given element from the ArrayList
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// (The remove() method returns false if the element does not exist in the ArrayList)
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boolean isRemoved = programmingLanguages.remove("Kotlin");
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System.out.println("After remove(\"Kotlin\"): " + programmingLanguages);
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// Remove all the elements belonging to the collection scriptingLanguages
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// Remove all the elements that exist in a given collection
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List<String> scriptingLanguages = new ArrayList<>();
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scriptingLanguages.add("Python");
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scriptingLanguages.add("Ruby");

‎java-arraylist-examples/src/SearchElementsInArrayListExample.java‎

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@@ -15,7 +15,7 @@ public static void main(String[] args) {
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// Check if an ArrayList contains a given element
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System.out.println("Does names array contain \"Bob\"? : " + names.contains("Bob"));
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18-
// Find the index of first occurrence of an element in an ArrayList
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// Find the index of the first occurrence of an element in an ArrayList
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System.out.println("indexOf \"Steve\": " + names.indexOf("Steve"));
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System.out.println("indexOf \"Mark\": " + names.indexOf("Mark"));
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‎java-arraylist-examples/src/SynchronizedArrayListExample.java‎

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Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@ public static void main(String[] args) throws InterruptedException {
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// Create a thread pool of size 10
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ExecutorService executorService = Executors.newFixedThreadPool(10);
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18-
// Create a Runnable task that increments the each element of the ArrayList by one
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// Create a Runnable task that increments each element of the ArrayList by one
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Runnable task = () -> {
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incrementArrayList(safeArrayList);
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};

‎java-arraylist-examples/src/UnsafeArrayListExample.java‎

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@@ -14,7 +14,7 @@ public static void main(String[] args) throws InterruptedException {
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// Create a thread pool of size 10
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ExecutorService executorService = Executors.newFixedThreadPool(10);
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// Create a Runnable task that increments the each element of the ArrayList by one
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// Create a Runnable task that increments each element of the ArrayList by one
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Runnable task = () -> {
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incrementArrayList(unsafeArrayList);
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};

‎java-hashmap-examples/src/AccessKeysFromHashMapExample.java‎

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@@ -5,13 +5,15 @@ public class AccessKeysFromHashMapExample {
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public static void main(String[] args) {
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Map<String, String> userCityMapping = new HashMap<>();
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// Check if HashMap is empty
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// Check if a HashMap is empty
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System.out.println("is userCityMapping empty? : " + userCityMapping.isEmpty());
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userCityMapping.put("John", "New York");
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userCityMapping.put("Rajeev", "Bengaluru");
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userCityMapping.put("Steve", "London");
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System.out.println("userCityMapping HashMap : " + userCityMapping);
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// Find the size of a HashMap
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System.out.println("We have the city information of " + userCityMapping.size() + " users");
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@@ -25,9 +27,17 @@ public static void main(String[] args) {
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System.out.println("City details not found for user " + userName);
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}
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// Check if a value exists in a HashMap
31+
if(userCityMapping.containsValue("New York")) {
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System.out.println("There is a user in the userCityMapping who lives in New York");
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} else {
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System.out.println("There is not user in the userCityMapping who lives in New York");
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}
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// Modify the value assigned to an existing key
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userCityMapping.put(userName, "California");
30-
System.out.println(userName + " moved to a new city " + userCityMapping.get(userName));
40+
System.out.println(userName + " moved to a new city " + userCityMapping.get(userName) + ", New userCityMapping : " + userCityMapping);
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// The get() method returns `null` if the specified key was not found in the HashMap
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System.out.println("Lisa's city : " + userCityMapping.get("Lisa"));

‎java-hashmap-examples/src/CreateHashMapExample.java‎

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@@ -11,6 +11,9 @@ public static void main(String[] args) {
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numberMapping.put("Two", 2);
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numberMapping.put("Three", 3);
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// Add a new key-value pair only if the key does not exist in the HashMap, or is mapped to `null`
15+
numberMapping.putIfAbsent("Four", 4);
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System.out.println(numberMapping);
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}
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}

‎java-hashmap-examples/src/HashMapEntryKeySetValuesExample.java‎

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@@ -15,14 +15,14 @@ public static void main(String[] args) {
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// HashMap's entry set
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Set<Map.Entry<String, String>> countryISOCodeEntries = countryISOCodeMapping.entrySet();
18-
System.out.println(countryISOCodeEntries);
18+
System.out.println("countryISOCode entries : " + countryISOCodeEntries);
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// HashMap's key set
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Set<String> countries = countryISOCodeMapping.keySet();
22-
System.out.println("Countries : " + countries);
22+
System.out.println("countries : " + countries);
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// HashMap's values
2525
Collection<String> isoCodes = countryISOCodeMapping.values();
26-
System.out.println("ISO Codes : " + isoCodes);
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System.out.println("isoCodes : " + isoCodes);
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}
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}

‎java-hashmap-examples/src/RemoveKeysFromHashMapExample.java‎

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@@ -10,16 +10,18 @@ public static void main(String[] args) {
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System.out.println("Husband-Wife Mapping : " + husbandWifeMapping);
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13-
// Unfortunately, Chris got divorced. Let's remove him from the mapping
13+
// Remove a key from the HashMap
14+
// Ex - Unfortunately, Chris got divorced. Let's remove him from the mapping
1415
String husband = "Chris";
1516
String wife = husbandWifeMapping.remove(husband);
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1718
System.out.println("Couple (" + husband + " => " + wife + ") got divorced");
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System.out.println("New Mapping : " + husbandWifeMapping);
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20-
// Divorce "Jack" only if He is married to "Linda"
21+
// Remove a key from the HashMap only if it is mapped to the given value
22+
// Ex - Divorce "Jack" only if He is married to "Linda"
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boolean isRemoved = husbandWifeMapping.remove("Jack", "Linda");
22-
System.out.println("Did Jack got removed from the mapping? : " + isRemoved);
24+
System.out.println("Did Jack get removed from the mapping? : " + isRemoved);
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// remove() returns null if the mapping was not found for the supplied key
2527
wife = husbandWifeMapping.remove("David");

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