packagecom.programiz.hashmap;importjava.util.HashMap;publicclassInsertElement{publicstaticvoidmain(String[] args){// Creating HashMap of even numbersHashMap<String, Integer> evenNumbers =newHashMap<>();// Using put()evenNumbers.put("Two",2); evenNumbers.put("Four",4);// Using putIfAbsent(...
import java.util.*; import java.util.stream.Collectors; public class MapList { public static void main(String[] args) { Map<Integer, String> map = new HashMap<>(); map.put(1, "a"); map.put(2, "b"); map.put(3, "c"); map.put(4, "d"); map.put(5, "e"); List<Intege...
Theget()method returns the value corresponding to the specified key in thehashmap. Example importjava.util.HashMap;classMain{publicstaticvoidmain(String[] args){// create an HashMapHashMap<Integer, String> numbers =newHashMap<>(); numbers.put(1,"Java"); numbers.put(2,"Python"); numbers...
示例1:Java HashMap containsKey() importjava.util.HashMap;classMain{ publicstaticvoidmain(String[] args){// create a HashMapHashMap<String,String> details =newHashMap<>();// add mappings to HashMapdetails.put("Name","Programiz"); details.put("Domain","programiz.com"); details.put("Loca...
HashMap: {1=java, 2=javascript, 3=python} Updated HashMap: {1=JAVA, 2=JAVASCRIPT, 3=PYTHON} In the above example, we have created a hashmap named languages. Notice the line, languages.replaceAll((key, value) -> value.toUpperCase()); Here, (key, value) -> value.toUpperCase() is ...
Example 2: entrySet() Method in for-each Loop importjava.util.HashMap;importjava.util.Map.Entry;classMain{publicstaticvoidmain(String[] args){// Creating a HashMapHashMap<String, Integer> numbers =newHashMap<>(); numbers.put("One",1); ...
HashMap: {1=Java, 2=Python, 3=JavaScript} Value for key 1: Java Value for key 4: Not Found In the above example, we have created a hashmap named numbers. Notice the expression, numbers.getOrDefault(1, "Not Found") Here, 1 - key whose mapped value is to be returned Not Found ...
Example 1: Replace an Entry in HashMap import java.util.HashMap; class Main { public static void main(String[] args) { // create an HashMap HashMap<Integer, String> languages = new HashMap<>(); // add entries to HashMap languages.put(1, "Python"); languages.put(2, "English");...
HashMap{1=Python, 2=Java, 3=JS} Java is present on the list. In the above example, we have created a hashmap namedlanguages. Notice the expressions, languages.containsValue("Java")// returns true Here, the specified valueJavais present in the mapping ({2=Java}). Hence, thecontainsVal...
In Java, we can achieve the functionality of the clear() method by reinitializing the hashmap. For example, import java.util.HashMap; class Main { public static void main(String[] args) { HashMap<String, Integer> numbers = new HashMap<>(); numbers.put("One", 1); numbers.put("Two...