Answer by anand krish for How do I efficiently iterate over each entry in a...
These are all the possible ways of iterating HashMap.HashMap<Integer,String> map = new HashMap<Integer,String>(); map.put(1, "David"); // Adding elements to Map map.put(2, "John");...
View ArticleAnswer by Badri Paudel for How do I efficiently iterate over each entry in a...
You can search for the key and with the help of the key you can find the associated value of the map as the map has unique key, see what happens when the key is duplicated here or here.Demo map...
View ArticleAnswer by Dubstep for How do I efficiently iterate over each entry in a Java...
Map<String, String> map = for (Map.Entry<String, String> entry : map.entrySet()) { MapKey = entry.getKey() MapValue = entry.getValue();}
View ArticleAnswer by Younes El Ouarti for How do I efficiently iterate over each entry...
Since Java 10, you can use local variable inference (a.k.a. "var") to make a lot of the already available answers less bloated. For example:for (var entry : map.entrySet()) {...
View ArticleAnswer by Ali Akram for How do I efficiently iterate over each entry in a...
Map.forEachWhat about simply using Map::forEach where both the key and the value are passed to your BiConsumer?map.forEach((k,v) -> { System.out.println(k +"->" + v);});
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Answer by Basil Bourque for How do I efficiently iterate over each entry in a...
If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained within it, what is the most efficient way of going through the map?If efficiency of looping...
View ArticleAnswer by Lova Chittumuri for How do I efficiently iterate over each entry in...
Using Java 7Map<String,String> sampleMap = new HashMap<>();for (sampleMap.Entry<String,String> entry : sampleMap.entrySet()) { String key = entry.getKey(); String value =...
View ArticleAnswer by user1098063 for How do I efficiently iterate over each entry in a...
I like to concat a counter, then save the final value of the counter;int counter = 0;HashMap<String, String> m = new HashMap<String, String>();for (int i = 0; i < items.length; i++){...
View ArticleAnswer by anandchaugule for How do I efficiently iterate over each entry in a...
An effective iterative solution over a Map is a for loop from Java 5 through Java 7. Here it is:for (String key : phnMap.keySet()) { System.out.println("Key: " + key +" Value: " +...
View ArticleAnswer by Taras Melnyk for How do I efficiently iterate over each entry in a...
With Java 8, you can iterate Map using forEach and lambda expression,map.forEach((k, v) -> System.out.println((k +":"+ v)));
View ArticleAnswer by bluehallu for How do I efficiently iterate over each entry in a...
Most compact with Java 8:map.entrySet().forEach(System.out::println);
View ArticleAnswer by ABHAY JOHRI for How do I efficiently iterate over each entry in a...
Use Java 8:map.entrySet().forEach(entry -> System.out.println(entry.getValue()));
View ArticleAnswer by Utpal Kumar for How do I efficiently iterate over each entry in a...
There are a lot of ways to do this. Below is a few simple steps:Suppose you have one Map like:Map<String, Integer> m = new HashMap<String, Integer>();Then you can do something like the...
View ArticleAnswer by shivampip for How do I efficiently iterate over each entry in a...
Iterating a Map is very easy.for (Object key : map.keySet()) { Object value = map.get(key); // Do your stuff}For instance, you have a Map<String, int> data;for (Object key : data.keySet()) { int...
View ArticleAnswer by Rupendra Sharma for How do I efficiently iterate over each entry in...
package com.test;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;import java.util.Set;public class Test { public static...
View ArticleAnswer by Witold Kaczurba for How do I efficiently iterate over each entry in...
The ordering will always depend on the specific map implementation.Using Java 8 you can use either of these:map.forEach((k,v) -> { System.out.println(k +":" + v); });Or:map.entrySet().forEach((e)...
View ArticleAnswer by Sajad NasiriNezhad for How do I efficiently iterate over each entry...
//Functional OperationsMap<String, String> mapString = new HashMap<>();mapString.entrySet().stream().map((entry) -> { String mapKey = entry.getKey(); return entry;}).forEach((entry)...
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Answer by Slava Vedenin for How do I efficiently iterate over each entry in a...
To summarize the other answers and combine them with what I know, I found 10 main ways to do this (see below). Also, I wrote some performance tests (see results below). For example, if we want to find...
View ArticleAnswer by Syd Lambert for How do I efficiently iterate over each entry in a...
If you want to iterate through the map in the order that the elements were added, use LinkedHashMap as opposed to just Map.This approach has worked for me in the past:LinkedHashMap<String,...
View ArticleAnswer by Nitin Mahesh for How do I efficiently iterate over each entry in a...
Lambda Expression Java 8In Java 1.8 (Java 8) this has become lot easier by using forEach method from Aggregate operations(Stream operations) that looks similar to iterators from Iterable Interface.Just...
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