publicvoiditerateUsingIteratorAndEntry(Map<String, Integer> map){ Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();while(iterator.hasNext()) { Map.Entry<String, Integer> entry = iterator.next(); System.out.println(entry.getKey() +":"+ entry.getValue()); } } N...
javaiteratejavaiteratehashmap Java上遍历HashMap的五种最佳方式如下使用Iterator遍历HashMap EntrySet使用Iterator遍历HashMap KeySet使用For-each循环迭代HashMap使用Lambda表达式遍历HashMap使用Stream API遍历HashMap示例代码如下package imoocStudy; importjava.util.HashMap; import j ...
Java上遍历HashMap的五种最佳方式如下使用Iterator遍历HashMap EntrySet使用Iterator遍历HashMap KeySet使用For-each循环迭代HashMap使用Lambda表达式遍历HashMap使用Stream API遍历HashMap示例代码如下package imoocStudy; importjava.util.HashMap; import j java iterate ...
In this post, I decided to compare the performance of different ways to traverse through theHashMapin Java.HashMapis a very widely used class, and most of the time, we fetch the value usingget(Object key)method provided by the class. But it is sometimes required to iterate over the whol...
This post will discuss how to iterate over a Map in sorted order in Java.1. Use TreeMapThe HashMap in Java provides good performance but doesn’t maintain any order of its elements. If you want insertion-order iteration with near-HashMap performance, you can use LinkedHashMap. If you ...
Best way to Iterator over HashMap in Java is by using Map.entrySet() method and Java 1.5 foreach loop. entrySet() returns Set of Map.Entry object and by looping over them, you can easily get access to key and value object. This is also fastest way to ite
There are several ways to iterate over the entries in a Map in Java. Here are some options:For-each loop: You can use a for-each loop to iterate over the entrySet of the Map. This is the most concise option:Map<String, Integer> map = new HashMap<>(); // add some entries to ...
Map<Integer, String> beers =newHashMap<Integer, String>(); beers.put(1,"La Chouffe"); beers.put(2,"Stella Artois"); beers.put(3,"Jupiler"); beers.put(4,"Westmalle Tripel");// Using iteratorIterator it = beers.entrySet().iterator();while(it.hasNext()){ ...
out.println(key + "=" + map.get(key))); 4. Verwenden Stream.forEach() Methode Wir können Streams in Java 8 und höher verwenden, um eine Karte zu iterieren, indem wir den Lambda-Ausdruck an die übergeben forEach() Methode der Stream Schnittstelle, die eine Aktion für jedes ...
longi =0;for(Iterator<Map.Entry<Integer, Integer>> entries =map.entrySet().iterator(); entries.hasNext(); ) { Map.Entry<Integer, Integer> entry = entries.next(); i += entry.getKey() + entry.getValue(); } Using the Java 8Stream API ...