what is hashmap in java collection tuorial
GIAN Tutorials
2:06 AM
HashMap in java with examples HashMap in java is most common Collection which we use nowadays. It stores entry in key-value pair. 1. HashMap implements Map interface which maps key to value. 2. It is not synchronized and is not thread safe. 3. Duplicate keys are not allowed 4. One null key and multiple null values are allowed 1 2 3 4 5 HashMap<Integer,String> employeeHashmap=new HashMap<Integer,String>(); employeeHashmap.put(1,"Arpit"); employeeHashmap.put(2,"John"); Example: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 package org.arpit.java2blog; import java.util.HashMap; public class HashMapBuiltMain { public static void main(String[] args) { HashMap<Integer, String> employeeHashmap = new HashMap<Integer, String>();
