foreword
This year's Android interview can be said to be very competitive. For people with average skills and education, every interview opportunity is very important. As an Android with average skills and education, I have gone through a month of interviews. I personally summarize it and share it with everyone who is working hard on the interview road.
interview content
The Android interview is an important part of every Android developer's career development. Mastering some common Android interview questions can not only perform well in the interview, but also improve your technical ability and knowledge breadth. Here are some practical Android interview questions for you to help you stand out in the interview and improve your Android development capabilities.
Chapter 1 Algorithms and Data Structures Interview Questions
- Please talk about the principle of HashMap and SparseArrary, the advantages of SparseArrary compared to HashMap, how does ConcurrentHashMap achieve thread safety?
- Please talk about the principle of HashMap, the access process, why red-black tree is used, the comparison between red-black tree and complete binary tree, HashTab, concurrentHashMap, what is in the concurrent package?
- Please talk about the underlying principle of hashmap put(). When a conflict occurs, how to add it (traverse along the linked list, and compare the key values one by one to see if they are consistent. If they are consistent, overwrite and replace them. After the inconsistent traversal, insert the position)?
- Please tell me how ArrayList ensures thread safety, except for adding keywords?
- Please talk about ArrayList, HashMap, LinkedHashMap?
- Please talk about the implementation principle of HashMap, the conditions for expansion, and what are the conditions for converting a linked list to a red-black tree?
- …
Chapter 2 Java Core Basic Interview Questions
- Java provides abstract classes and interfaces, how to choose during development?
- What do overloading and overriding mean and what is the difference?
- What are static inner classes? What is the difference between non-static inner classes and non-static inner classes?
- When passing parameters in Java, is it passed by value or by reference?
- Difference between using equals and == for comparison
- String s = new String("xxx"); How many String objects are created?
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Chapter 3 Java In-depth Generics and Annotations Interview Questions
- What is generics, and what about generic erasure?
- Can List<String> be converted to List<Object>
- What is the difference between super and extends in Java generics?
- What are annotations? What are the usage scenarios?
- …
Chapter 4 Java Concurrent Programming Interview Questions
- If there is only one cpu, single core, is multi-threading still useful?
- What is the difference between sychronied modified ordinary methods and static methods? What is visibility?
- What optimizations did Synchronized do after JDK1.6
- The principle of CAS lock-free programming
- Principle of AQS
- Implementation principle of ReentrantLock
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Chapter 10 Framework Kernel Analysis Interview Questions
- What are the ways of multi-process communication in Android?
- Describe the principle of the Binder mechanism?
- Why does Android adopt Binder as the IPC mechanism?
- What is the working process of the Binder thread pool?
- What is the full name of AIDL? how to work? What types of data can be processed?
- The difference and connection between Pid&Uid in Android
- …
Chapter 11 Android Component Kernel Interview Questions
- The life cycle of Acitvity, how to destroy an Activity?
- Activity's 4 major startup modes, and issues that need attention in development, such as the call of onNewIntent()
- Intent display jump and implicit jump, how to use?
- Activity A jumps to B, B jumps to C, A cannot jump directly to C, how does A send a message to C?
- How does Activity save state?
- Please describe the startup process of the Activity, starting from clicking the icon.
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Chapter 12 Program Performance Optimization and Data Persistence Interview Questions
- The size of a picture 100x100 in memory?
- Memory optimization, memory thrashing and memory leaks.
- When does a memory leak happen? give a few examples
- Bitmap compression, the difference between 100% and 90% quality?
- Use of TraceView to find CPU usage
- Finding memory leaks
- …
Chapter 13 Open Source Framework Interview Questions
- The significance of componentization in the project
- The principle of ARouter in componentization
- Talk about your understanding of APT technology
- Talk about the caching mechanism design of the Glide framework
- Talk about your understanding of the Glide life cycle
- What should be the reason for memory overflow when using the Glide framework in the project?
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