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Count Bit Set
package com.algo.bits;
import java.io.*; 
 
class countSetBits
{
    /* Function to get no of set 
    bits in binary representation 
    of positive integer n */
    static int countSetBits(int n)

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Lock : This is the base interface for Lock API. It provides all the features of synchronized keyword with additional ways to create 
different Conditions for locking, providing timeout for thread to wait for lock. methods are lock(),unlock(),tryLock(),newCondition()

Condition: Condition objects are similar to Object wait-notify model with additional feature to create different sets of wait.
A Condition object is always created by Lock object. Some of the important methods are await() that is similar to wait() and signal(),
signalAll() that is similar to notify() and notifyAll() methods.

Benefits :
synchronization blocks or methods can cover only one method whereas we can acquire the lock in one method and release it in another method
with Lock API.

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Control plane, Data Plane, Management Plane

FCAPS : 
a). Fault (alarma), b). configure(Loopback,OSPF,RSVP,MPLS_TE)  3). Accounting(no of packets send recieve)  4). Performance (failed packets)
5). Security

SONET DWDM :

Dense wavelength division multiplexing (DWDM) is a fiber-optic transmission technique that employs light wavelengths to transmit data parallel
-by-bit or serial-by-character.

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--------------------------------------------------------------
In the java.util.concurrent package there are three interfaces:
Executor — Used to submit a new task.
ExecutorService — A subinterface of Executor that adds methods to manage lifecycle of threads used to run the submitted
tasks and methods to produce a Future to get a result from an asynchronous computation.
ScheduledExecutorService — A subinterface of ExecutorService, to execute commands periodically or after a given delay.
---------------------------------------------------------------
*** How to Create an Executor  ***
To create an Executor it is possible to use the factory Executors class.
Most common methods are used to create:

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1                                                                  ------------->                 1
Stock                                                                                             Stock_Daily_Record
@OneToOne(fetch = FetchType.LAZY, mappedBy = "stock",                                     @OneToOne(fetch = FetchType.LAZY)
cascade = CascadeType.ALL)                                                                @PrimaryKeyJoinColumn


import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;

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   1                                                           ------->       many
Stock                                                          ------->       Stock_Daily_Record
@OneToMany(fetch = FetchType.LAZY, mappedBy = "stock")         ------->       @ManyToOne(fetch = FetchType.LAZY)
	                                                                            @JoinColumn(name = "STOCK_ID", nullable = false)

package com.mkyong.stock;

import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;

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* Representational State Transfer uses HTTP protocol for data communication developed by Roy Fielding.
* Everything is Resource (REST uses various representations to represent a resource like Text, JSON and XML)
* RESTful web services are light weight, highly scalable and maintainable. 
* Http methods : GET, PUT, POST, DELETE, OPTIONS
* PUT used to create a new resource and POST used to update the existing resource
* OPTIONS used to get the list of supported operations on a resource.
* A web service is a collection of open protocols and standards used for exchanging data between applications or systems. Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks.
Ex:--------------

we will create UserService.java, User.java,UserDao.java files under the com.tutorialspoint package.

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* Inheritance          2. Polymorphism           3. Abstraction          4. Encaptulation
* Polymorphism --> Method OverLoading             Method Overriding
   * Method Overriding Rules:
   a). public private protected modifier
      class Parent
      {
        protected Parent get() throws IOException             
        {
          return null;
        }

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/* 
ForkJoinPool methods :
getActiveThreadCount(), getParallelism(), getPoolSize(), invoke(ForkJoinTask fjt), getRunningThreadCount()

RecursiveTask has method compute

 Code:
 */

package com.thread.fork;

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save Heap dump using jconsole :

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\vikas.verma1>cd workspace\demo

C:\Users\vikas.verma1\workspace\demo>
C:\Users\vikas.verma1\workspace\demo>cd src