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Difference between HashTable and HashMap in Java
Following are the notable differences between HashTable and HashMap classes in Java.
| HashTable | HashMap | |
|---|---|---|
| Synchronized | HashTable is synchronized. | HashMap is not synchronized. |
| Thread Safe | HashTable is thread safe. | HashMap is not thread safe. |
| Null objects | HashTable does not allows null keys or null values. | HashMap allows one null key and multiple null values. |
| Performance | HashTable is faster. | HashMap is slower than HashTable. |
| Since Java Version | 1.2 | 1.5 |
Example
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
public class Tester {
public static void main(String args[]) {
Map<String, String> map = new HashMap<String, String>();
map.put("1", "One");
map.put("2", "Two");
map.put("3", "Three");
map.put("5", "Five");
map.put("6", "Six");
System.out.println("HashMap: " + map);
Map<String, String> map1 = new Hashtable<String, String>();
map1.put("1", "One");
map1.put("2", "Two");
map1.put("3", "Three");
map1.put("5", "Five");
map1.put("6", "Six");
System.out.println("HashTable: " + map1);
}
}Output
HashMap: {1 = One, 2 = Two, 3 = Three, 5 = Five, 6 = Six}
HashTable: {6 = Six, 5 = Five, 3 = Three, 2 = Two, 1 = One}
Updated on: 21-Jun-2020
3K+ Views
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