package com.instaceofjava; public class primenumbers { public static void main(String[] args) { int num=50; int count=0; for(int i=...

Java Enum: In this tutorial I will explain what is enum, how to use enum in different areas of a Java program and an example program on i...

Like HashMap,  Hashtable  stores key/value pairs in a  hash table . When using a  Hashtable , you specify an object that is used as a key, ...