Feed manufacturers is the dream of most programmers, manufacturers and into the threshold is relatively high, so here put together a Ali, the US group, drops, headlines and other manufacturers Daquan interview outlining the knowledge have: Java foundation, spring, springmvc, springboot, springcloud, JVM, Tomcat, dubbo, netty, zookeeper total of 500+ questions pavement
Ants gold dress (three sides) Zookeeper + micro-messaging middleware service + + high and bold hair style architecture
Side
JVM data storage model, the new generation, old generation of construction?
java GC algorithm, when it will trigger minor gc, when it will trigger the full gc?
Reachability analysis which considered the GC GC ROOT?
Are you familiar with the JVM tuning parameters, which used the tuning tool?
Java What types of locks?
Describe the processing flow in the thread pool?
Class loading mechanism, a class is loaded into the virtual machine a total of several steps, the order of these steps which is fixed, which is not fixed, why not fixed
hashmap is thread safe, concurrenthashmap is thread-safe, how to achieve thread-safe?
The volatile keyword to solve the problem, implement the principle of what is
concurrent containers which are different, concurrent container and container sync
two faces
at work, and pay attention to matters of optimizing SQL statements
which library or framework to use NIO
the Spring which has a few kind of injection method, under what circumstances with which, ioc implement the principle of
how to locate a slow query, a service a number of SQL how you quickly locate
the clustered index and non-clustered indexes know? What happens with the clustered index what circumstances non-clustered index
What storage structure Nosql engine use, what relational databases and NoSQL respective strengths and weaknesses, how technology selection?
Under the micro-service architecture, if there is an order system, an inventory system, how to ensure that the transaction?
Distributed coherence protocols raft, paxos understand it
Zookeeper in ZAB agreement, choose the main algorithm
on three sides
introduce themselves
Participate in concurrent projects, from design to deployment, in accordance with the process say it again.
You used the project-related redis, with what scene, how to use?
Principle mysql synchronization mechanism, which has several synchronous method
database master-slave synchronization how to achieve and how to achieve affairs
talk about your understanding of SOA and micro services, and distributed architecture from the application level adjustment and the challenges involved.
Ali middleware metaQ and principles of the existing kafka What are the similarities and differences
in Ali had to know what middleware you? The principle? And other open source message queue What are the characteristics?
Why change the company?
Three to five years of career planning?
You have to ask me?
Java foundation
1.Java Overview
2. What is programming
3. What is Java
three versions later 4.jdk1.5
5.JVM, the relationship between the JRE and JDK
6. What is cross-platform? What is the principle
7.Java language which features
8. What is bytecode? What is the biggest benefit of using bytecode is
9. What is the main class Java program? The main class of applications and applets What's the difference?
What are the differences between 10.Java applications and applets?
11.Java difference between C ++ and
12.Oracle JDK and Comparative OpenJDK
13. basic grammar
14. The data type
15.Java what data type
16.switch acting on whether byte, whether acting on a long, whether in the role on String
17. a method of calculating the most efficient multiplied by 2. 8
18.1Math.round (11.5) is equal to the number? How much Math.round (-11.5) equals
19.float f = 3.4; correct
20.short s1 = 1; s1 = s1 + 1; wrong it short s1 = 1;? S1 + = 1; it wrong
21 coding
what coding scheme 22.Java language adopted? What are the characteristics?
23. Comment
24. What Java annotations
25. The access modifiers
26. The access modifiers public, private, protected, and when the difference is not write (default)
27. Operators
difference and & & & 28.
29. The keywords
30.Java there GOTO
31.final what's the use?
32.final finally finalize the difference between
the usage 33.this keyword
usage 34.super keyword
difference 35.this with the super
36.static main meaning of existence
37.static is unique
38.static scenarios
39.static note matters
40. the flow control statements
41.break, continue, return and role distinction
42. in Java, how to jump out of the current multiple nested loop
43. the object-oriented
44. the object-oriented overview
distinction 45. the object-oriented and process-oriented
46 . three characteristics of object-oriented
Object-oriented features 47. What aspects
48. What is a multi-state mechanism? Java language is how to achieve polymorphism?
49. The five basic principles of object-oriented What is the (optional)
50. Class and Interface
Comparison 51. abstract classes and interfaces
52. The common classes and abstract classes What are the differences?
53. abstract class can be modified using the final it?
54. create an object with what keywords? Object instances and object references What's the difference?
55. The method of variables and
56. The difference between the member variables and local variables which
57. defined in Java that does not work and has no effect constructor parameter
58. Before subclass constructor method call will first call the parent class without parameters construction method, which aims?
59. What is the role of a class constructor is? If the class does not declare a constructor, the program can perform correct? why?
60. What are the characteristics of the construction method?
61. The difference between static and instance variables
62. The difference between static variables and common variables
63. The static methods and instance methods What is the difference?
64. call a non-static member within a static method Why is it illegal?
65. What is the return value of the method? What is the role of the return value?
66. The inner class
67. What is the inner class?
68. The internal classification category which
69. static inner classes
70. The members of the inner class
71. Local inner classes
72. anonymous inner classes
73. The advantage of internal class
74. What inner class scenarios
75. The partial inner classes and anonymous inner when class local variables, why variables must be added final?
76. The internal or related, to see the results of running the program say
77. rewrites heavy load
78. constructor (constructor) can be rewritten whether (the override) Overload (Overload) and the difference between rewritable (Override) a. Overloaded method can be differentiated according to the type of return?
79. The objects are equal judgment
80. == and equals the difference between what
81.hashCode and equals (important)
equal to their reference point is equal to 82. The object, both what is the difference?
83. The value passed
84. When an object is passed as a parameter to a method, this method can change the properties of this object, and return the results back to the 85. The change, then in the end is passed by reference or value transfer here
86. Why Java value is passed only
87. the value is passed and passed by reference any difference
88.Java package
89.JDK commonly used package which
90.import java and javax What is the difference
91.IO flow
92.java flow into the IO several?
93.BIO, NIO, AIO What is the difference?
94.Files What are the common way?
95. The reflector
96. What is a reflection?
97. The advantages and disadvantages of reflection mechanism
98. scenarios reflection of what?
Three ways to get reflected 99.Java
100. The network programming
101. The common API
102.String relevant
difference 103. Character constants and string constants
104. What is the string constant pool?
105.String is the most basic type of data you
what features have 106.String
Why 107.String is immutable it?
108.String really is immutable it?
109. can inherit String class
110.String str = "i" and the String str = new String ( "i ") the same?
111.String s = new String ( "xyz "); created several String objects
112. How to reverse a string?
113. The array has no length () method? String has no length () method
commonly used method 114.String class are those?
115. When using the HashMap, to do with String key What are the benefits?
116.String and StringBuffer, StringBuilder is what is the difference? Why String is immutable
117.Date associated
118. related packaging
119. Automatic boxing and unboxing
120.int Integer and any difference
121.Integer a = 127 and it is equal to Integer b = 127
122. A common tool library
123. the test unit
124. the log
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