After Ali was cold on the second side, Meituan had already got an offer, thanks to the Java cheats of Meituan.

After the interview with Ali last month, I went to interview with Meituan and successfully got the offer. Before I interviewed Meituan, I did my homework and collected a lot of interview materials on the Internet. Among them, a summary of the Java knowledge points of Meituan bosses was very helpful to me. Today I also share it for your reference:

JVM

1. Thread
2. JVM memory area
3. JVM runtime memory
4. Garbage collection and algorithms
5. Four reference types in JAVA
6. GC generational collection algorithm VS partition collection algorithm
7. GC garbage collector
8. JAVA IO / NIO
9. JVM class loading mechanism

JAVA collection

1. Interface inheritance and implementation
2. List
3. ArrayList (array)
4. Vector (array implementation, thread synchronization)
5. LinkList (linked list)
6. Set
7. HashSet（Hash表）
8. TreeSet (binary tree)

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JAVA multi-threaded concurrency

1. JAVA Concurrent Knowledge Base
2. JAVA thread implementation / creation method
3. 4 types of thread pools
4. Thread life cycle (state)
5. 4 ways to terminate threads
6. The difference between sleep and wait
7. The difference between start and run
8. JAVA background thread
9. JAVA lock
10. Basic thread method 4.1.11. Thread context switch
11. Synchronization and deadlock
12. Principle of Thread Pool
13. JAVA blocking queue principle
14. Usage of CyclicBarrier, CountDownLatch, Semaphore
15. The role of the volatile keyword (variable visibility, prohibit reordering)
16. How to share data between two threads

JAVA basics

1. JAVA abnormal classification and treatment
2. JAVA reflection
3. JAVA annotation
4. JAVA inner class
5. JAVA generics
6. JAVA serialization (creating reusable Java objects)
7. JAVA copy

Spring principle

1. Spring features
2. Spring core components
3. Spring common modules
4. Spring main package
5. Spring common annotations
6. Spring third-party integration
7. Spring IOC principle
8. Spring APO principle
9. Spring MVC principle
10. Spring Boot principle
11. JPA principle
12. Mybatis cache
13. Tomcat architecture

Microservice

1. Service registration discovery
2. API gateway
3. Configuration Center
4. Event scheduling (kafka)
5. Service tracking (starter-sleuth)
6. Service Fuse (Hystrix)
7. Hystrix circuit breaker mechanism
8. API management

Netty 与RPC

1. Netty principle
2. Netty high performance
3. Netty RPC implementation
4. Key technology
5. Core process
6. Message codec
7. Communication process
8. RMI implementation

Distributed cache

1. Cache avalanche
2. Cache penetration
3. Cache warm-up
4. Cache update
5. Cache degradation

The internet

1. 7-layer network architecture
2. TCP/IP principle
3. TCP three-way handshake/four waved hands
4. HTTP principle
5. CDN principle
6. Distribution Service System
7. Load balancing system
8. Management system

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Log

1. Slf4j
2. Log4j
3. LogBack
4. Logback advantages
5. ELK

Zookeeper

1. Zookeeper concept
2. Zookeeper role
3. Working principle of Zookeeper (atomic broadcast)
4. Znode has four types of directory nodes

Kafka

1. Kafka concept
2. Kafka data storage design
3. Data files of partition (offset, MessageSize, data)
4. Data file segmentation (sequential read and write, segment command, binary search)
5. Data file index (segment index, sparse storage)
6. Producer design
7. Load balancing (partitions will be evenly distributed to different brokers)
8. Batch send
9. Compression (GZIP or Snappy)
10. Consumer design

RabbitMQ

1. RabbitMQ concept
2. RabbitMQ architecture
3. Exchange type

Design Patterns

1. Design Principles
2. Factory method pattern
3. Abstract factory pattern
4. Singleton mode
5. Builder mode
6. Prototype mode
7. Adapter mode
8. Decorator mode
9. Agency model
10. Appearance mode
11. Bridge mode
12. Combination mode
13. Flyweight model
14. Strategy mode
15. Template method pattern
16. Observer mode
17. Iterative subpattern
18. Chain of Responsibility Model
19. Command mode
20. Memo mode

Load balancing

1. Layer 4 load balancing vs. Layer 7 load balancing
2. Load balancing algorithm/strategy
3. LVS
4. Keepalive
5. Nginx reverse proxy load balancing
6. HAProxy

database

1. Storage engine
2. index
3. Three paradigms of database
4. The database is a transaction
5. Stored procedure (a set of SQL statements for a specific function)
6. Trigger (a program that can be executed automatically)
7. Database concurrency strategy
8. Database lock
9. Distributed lock based on Redis
10. Classification table
11. Two-phase commit agreement
12. Three-phase commit agreement
13. Flexible transaction
14. CAP

JAVA algorithm

1. Binary search
2. Bubble sort algorithm
3. Insertion sort algorithm
4. Quick sort algorithm
5. Hill sorting algorithm
6. Merge sort algorithm
7. Bucket sorting algorithm
8. Radix sorting algorithm
9. Pruning algorithm
10. Backtracking algorithm
11. Shortest path algorithm
12. Maximum subarray algorithm
13. Longest Common Subsequence Algorithm
14. Minimum spanning tree algorithm

data structure

1. Stack
2. Queue
3. Link
4. Hash Table
5. Sorted binary tree
6. Red black tree
7. B-TREE
8. bitmap

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