Check if a particular key exists in Java Hashtable : HashTable Map « Collections Data Structure « Java

Home Java 1. 2D Graphics GUI 2. 3D 3. Advanced Graphics 4. Ant 5. Apache Common 6. Chart 7. Class 8. Collections Data Structure 9. Data Type 10. Database SQL JDBC 11. Design Pattern 12. Development Class 13. EJB3 14. Email 15. Event 16. File Input Output 17. Game 18. Generics 19. GWT 20. Hibernate 21. I18N 22. J2EE 23. J2ME 24. JavaFX 25. JDK 6 26. JDK 7 27. JNDI LDAP 28. JPA 29. JSP 30. JSTL 31. Language Basics 32. Network Protocol 33. PDF RTF 34. Reflection 35. Regular Expressions 36. Scripting 37. Security 38. Servlets 39. Spring 40. Swing Components 41. Swing JFC 42. SWT JFace Eclipse 43. Threads 44. Tiny Application 45. Velocity 46. Web Services SOA 47. XML

Java » Collections Data Structure » HashTable Map   Check if a particular key exists in Java Hashtable       import java.util.Hashtable; public class Main {   public static void main(String[] args) {     Hashtable<String, String> ht = new Hashtable<String, String>();     ht.put("1", "One");     ht.put("2", "Two");     ht.put("3", "Three");     boolean blnExists = ht.containsKey("2");     System.out.println("2 exists in Hashtable ? : " + blnExists);   } }                            Related examples in the same category 1. Check if a particular value exists in Java Hashtable 2. Get Collection of Values from Java Hashtable 3. Get Set view of Keys from Java Hashtable 4. Get Size of Java Hashtable 5. Iterate through keys of Java Hashtable 6. Remove all values from Java Hashtable 7. Scan the content of a hashtable 8. Remove value from Java Hashtable 9. Sort keys in an Hashtable 10. Associates keys with values 11. Iterate through values of Java Hashtable 12. A simple Map implementation 13. Hash table with separate chaining 14. Hash table with linear probing 15. Hash table with double hashing 16. Working with Key-Value Pairs in a Hashtable 17. Demonstrate the Hashtable class, and an Enumeration 18. Demonstrate the HashMap class, and an Iterator 19. Soft HashMap 20. MultiMap extends AbstractMap 21. Array Map extends AbstractMap 22. Demonstrating the WeakHashMap 23. Use treemap 24. Sorting Elements in a TreeMap 25. What you can do with a TreeMap 26. A Map implemented with ArrayLists 27. Simple demonstration of HashMap 28. HashMap 29. Caching Hashtable 30. Hashtable that supports mostly-concurrent reading, but exclusive writing. 31. Lru Hashtable 32. Bucketized Hashtable 33. Custom hash table based on customized array