Java – Duyệt/lặp Trên HashMap | HOW TO CODE

Có 2 cách để lặp 1 map: Giả sử có HashMap sau

HashMap<String, String> mapDatas = new HashMap<>(); mapDatas.put("first", “A”); mapDatas.put("second", "B");

• Lấy ra tập key rồi duyệt dựa trên nó

for (String key : mapDatas.keySet()) { System.out.println("key: " + key + " value: " + mapDatas.get(key)); } Set<String> keySet = mapDatas.keySet(); Iterator<String> keySetIterator = keySet.iterator(); while (keySetIterator.hasNext()) { String key = keySetIterator.next(); System.out.println("key: " + key + " value: " + mapDatas.get(key)); }

• Sử dụng EntrySet và vòng lặp for hoặc iterator

Set<Map.Entry<String, String>> entrySet = mapDatas.entrySet(); for (Entry entry : entrySet) { System.out.println("key: " + entry.getKey() + " value: " + entry.getValue()); } Iterator<Entry<String, String>> entrySetIterator = entrySet.iterator(); while (entrySetIterator.hasNext()) { Entry<String, String> entry = entrySetIterator.next(); System.out.println("key: " + entry .getKey() + " value: " + entry.get(key)); } Like Loading... Post navigation ← Java – Kiểm tra Array có phần tử giống nhau hay không? Java – Sự khác nhau giữa HashMap và HashTable →

Leave a comment Cancel reply

Δ

Search Recent Posts

• test
• Java – NIO – Channel
• Java – NIO – Buffer
• Java – NIO – Giới thiệu
• Java – Singleton

Bài viết

• November 2015 (44)

Categories

• Game (1)
• Java (42)
• Uncategorized (1)

TagsCollection Concurrency Design Pattern Game I/O Java NIO String Thread Privacy & Cookies: This site uses cookies. By continuing to use this website, you agree to their use. To find out more, including how to control cookies, see here: Cookie Policy

• Comment
• Reblog
• Subscribe Subscribed
  • HOW TO CODE
  Sign me up
  • Already have a WordPress.com account? Log in now.
• • HOW TO CODE
  • Customize
  • Subscribe Subscribed
  • Sign up
  • Log in
  • Copy shortlink
  • Report this content
  • View post in Reader
  • Manage subscriptions
  • Collapse this bar

%d Design a site like this with WordPress.comGet started