First, I once regretted stepping into the programmer’s profession

I believe that everyone should have faced the choice of professional this problem, I also did not avoid, but I still calculate more decisive, because I was interested in computer from junior high school, and then very Buddha of the computer major, university, I still have great hope for this major.

Until graduation work for three years, I found now work only add up, don’t finish code, add and delete, completely lost the soul, and I at the beginning of beginner’s mind is completely the opposite, after much consideration, I resigned to the companies interviewed wanted “ali”, but was helpless side brush down, and during that time, I really autistic to regret step into this industry.

The article will show my notes and ali interview treasure book, study notes and video, need a complete version of the friend can “click here” to get free!

Two, review the finishing ali side of the test (start again, prepare for Ali)

But I can’t be reconciled, or want to give it one last try

That’s basically it. There are still some scattered questions that I can’t remember, and the answers are sorted out.

  • To introduce myself
  • How does the JVM load the process of a class, and what are the methods in the parent delegate model?
  • How is HashMap implemented?
  • ConcurrentHashMap is a thread-safe Hashtable, and ConcurrentHashMap is thread-safe.
  • HashMap is different from HashTable. Is HashTable thread safe?
  • How many ways are there to communicate between processes
  • What parts of the JVM are divided into, and what does each part do?
  • How does the JVM GC, new generation, old age large object, permanent generation, what does it store?
  • In the reference reachability analysis algorithm used by GC, which objects can be used as GC Roots objects?
  • Quicksort, process, complexity?
  • What is a binary balanced tree, how to insert nodes, delete nodes, say the key steps.
  • How does TCP ensure reliable transmission? Three handshake process
  • Differences between TCP and UDP
  • Sliding window algorithm?
  • What are the most common commands you use on Linux?
  • When does an operating system deadlock occur?
  • What are the common hash algorithms?
  • What is a consistent hash?
  • How to understand distributed locks?
  • What are the patterns in the database?
  • What is the structure of an index in a database? When is an index appropriate?
  • What are NIO, BIO, and AIO in Java?
  • What tools do you use to debug the program? Have you used JConsole?
  • Now a process is suspended. How do I use the tool to find out the cause?
  • How does thread synchronization relate to blocking? Does synchronization have to block? Does blocking have to be synchronized?
  • What’s the difference between synchronous and asynchronous?
  • Have thread pools been used?
  • How do I create a singleton pattern? Said double check, he said it’s not thread-safe. How to create an efficient singleton efficiently?
  • What is used under the Concurrent package?
  • What databases are commonly used? Has Redis used it?
  • Know anything about Hadoop? What are the components of Hadoop? HDFS, hive, hbase, zookeeper. Talk about the MapReduce programming model.
  • What open source agreements do you know?
  • What open source software do you know?
  • What books have you been reading lately?
  • Do you have any questions for me?

Eat this super complete interview treasure book, finally get ant Financial offer!

Since JOINING Ali, I have realized the meaning of my career and am glad THAT I did not give it up in frustration.

The treasure book is roughly divided into these pieces:

  • Java based
  • The database
  • The Java virtual machine
  • JSP&Servlet
  • spring&Hibernate
  • The operating system
  • Linux
  • Computer network
  • algorithm

Java based

1. What is the difference between object – and process-oriented? Can object orientation be implemented with process orientation? Isn’t that object oriented?

2, static and final

How does a Concurrent HashMap ensure thread safety?

4, because others know how to realize the source code, deliberately construct the same hash string to attack, how to deal with, that JDK7 how to do?

5. Java serialization, how to realize serialization and deserialization, what are the common serialization protocols

6, Java to achieve multithreading and the difference between the three ways

7. Thread safety

8. How do multithreading carry out information interaction

9. Check whether Java memory leaks or overflows

The database

1. What are the common database types? Redis used

2. What are the paradigms in the database?

3, index structure in database? When is an index appropriate?

4. Dirty reading, unrepeatable reading, and phantom reading

6, The difference between MyISA and InnDB engine

7, database ACID

Transaction isolation level

How to write paging query statement in database?

The Java virtual machine

1. JVM garbage disposal methods (tag removal, copy, tag collation)

2, How does the JVM GC, new generation, old generation, persistent generation, what are stored, and the role of each region?

3. In the reference reachability analysis algorithm used by GC, which objects can be used as GC Roots objects?

4. When to conduct MinGC and FulilGc

5. How do the various garbage collectors work

6, Java virtual machine memory partition, function of each area

7. What tools can be used to detect memory leaks

How does the JVM load a class? What methods in the parent delegate model might have a parent class loader that loads the same class? If the same class is loaded, which class should be used?

How does Java instantiate objects

JSP&Servlet

1. Servlet life cycle

2, Jsp and Servlet differences

3. What are the ways to save session state and what are the differences

4. The difference between cookies and sessions

spring&Hibernate

1. Understanding of Spring IOC and AOP and implementation principles

2. IOC container loading process

3. The difference between dynamic proxy and Cglib implementation

4. Realization principle of agent

Hlbernate the difference between level 1 cache and level 2 cache

6. Principles of Spring MVC

7. Briefly describe Hibernate common optimization strategies

The operating system

1. Are health conditions deadlocked under operating systems?

2. How to understand distributed locks

3. What are the ways of interprocess communication?

4. Thread synchronization and blocking? Does synchronization have to block? Does blocking have to be synchronized?

5. How does the operating system schedule pages?

Linux

1. How to schedule processes in Linux?

2. What are the most common commands you use in Linux?

Computer network

1. The difference between Http and HTTPS

2, TCP how to ensure reliable transmission? Three handshakes?

3, why TCP connection requires three handshakes, two can not, why

4. What happens if the client constantly requests connections?

5. What is the difference between GET and POST?

6, TCP and UDP? How to improve TCP

7. The process from entering the URL to getting the page

algorithm

1. How to determine whether a single linked list has rings?

2. Quicksort, process, complexity? When does it apply and when does it not?

3. What is binary balanced tree? How to insert and delete nodes

5, binary search process

6, merge sort process? Time complexity? Space complexity?

Given you ten thousand numbers, how to find out all the repeated numbers? Using all the methods you can think of, what is the time complexity versus the space complexity?

8, Given an array, how to find two numbers and k

Find the smallest or largest 10.

During the period I have also seen a lot of interview notes, there is a need for a friend direct private message I password “ashore” can be free access!

Three, is this enough? No, not nearly enough!

It is certainly helpful to be familiar with ali’s interview questions in advance. However, as a technical profession, having solid skills is the most useful tool for you to face the interviewer, which is the confidence emanating from the inner.

When PREPARING for Ali, I spent the most time on learning technology, which accounted for 70 percent of my learning plan. Here are some study notes and learning videos that I thought were quite good during my study, which can be shared with you by private message with my password “disembarked”!

Four,

Why do I want to write this article, in fact, I feel that learning can’t stop, on the Internet and share, discuss, not only can meet more people, still can broaden their horizons, learn more technology, I will be in CSDN, blogs, share technology such as the Denver nuggets, this also is a kind of learning method.

If you need the study notes, study videos and interview questions mentioned in the article, you can “click here” to share them with you for free!

Thank you for your attention. We will share more dry goods with you in the future.