import java.util.HashMap;
public class GetSizeOfHashMap {
public static void main(String[] args) {
// TODO Auto-generated method stub
HashMap hMap = new HashMap();
System.out.println("Size of HashMap : " + hMap.size());
//add key value pairs to HashMap using put method
hMap.put("1","One");
hMap.put("2","Two");
hMap.put("3","Three");
System.out.println("Size of HashMap after addition : " + hMap.size());
//remove one element from HashMap using remove method
Object obj = hMap.remove("2");
System.out.println("Size of HashMap after removal : " + hMap.size());
}
}
Console：
Size of HashMap : 0
Size of HashMap after addition : 3
Size of HashMap after removal : 2
