https://github.com/yixiaohan/simple-java-zh-cn

Simple Java is a collection of frequently asked Java questions.中文翻译
https://github.com/yixiaohan/simple-java-zh-cn

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Simple Java is a collection of frequently asked Java questions.中文翻译

Host: GitHub
URL: https://github.com/yixiaohan/simple-java-zh-cn
Owner: Yixiaohan
Created: 2016-06-18T14:19:28.000Z (over 9 years ago)
Default Branch: master
Last Pushed: 2016-07-21T15:11:14.000Z (about 9 years ago)
Last Synced: 2024-12-30T07:25:36.620Z (9 months ago)
Homepage: https://github.com/Yixiaohan/simple-java-zh-CN
Size: 27.3 KB
Stars: 2
Watchers: 3
Forks: 2
Open Issues: 0
Metadata Files:
- Readme: README.md

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# simple-java-zh-CN
Simple Java is a collection of frequently asked Java questions.中文翻译

##1. Strings and Arrays 字符串和数组

[What is string immutability?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Diagram%20to%20show%20Java%20String%E2%80%99s%20Immutability.md)

[How does substring() work?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/The%20substring()%20Method%20in%20JDK%206%20and%20JDK%207.md)

[Why string is immutable?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Why%20string%20is%20immutable%20.md)

[Create Java string Using ” ” or constructor?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Create%20Java%20String%20Using%20%E2%80%9D%20%E2%80%9D%20or%20Constructor%3F.md)

Is string passed by reference?

[length vs. length()](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Start%20from%20length%20%26%20length()%20in%20Java.md)

[How to check if an array contains a value efficiently?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/How%20to%20Check%20if%20an%20Array%20Contains%20a%20Value%20in%20Java%20Efficiently%3F.md)

[What is varargs?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Java%20Varargs%20Examples%20Java.md)

[What exactly is null?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/What%20exactly%20is%20null%20in%20Java%3F.md)

##2. Common Methods

Comparator vs. Comparable

The contract between hashCode() and equals()

Java passes object by reference or by value?

Iteration vs. recursion

##3. Classes and Interfaces

[Overloading vs. overriding](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Overriding%20vs.%20Overloading%20in%20Java.md)

What is instance initializer?

Fields can not be overridden?

Inheritance vs. composition

How to use Java Enum?

How many types of inner classes?

What is inner interface?

Constructors of sub and super classes?

4 access levels

When to use private constructors?

## 4.1 Collections

[Class hierarchy of Collection and Map](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/The%20Interface%20and%20Class%20Hierarchy%20Diagram%20of%20Java%20Collections%20.md)

ArrayList vs. LinkedList vs. Vector

HashSet vs. TreeSet vs. LinkedHashSet

HashMap vs. TreeMap vs. HashTable vs. LinkedHashMap

Sort Map By Value

[A TreeSet example](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/A%20simple%20TreeSet%20example.md)

Efficient counter

[Frequently used methods of HashMap](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Frequently%20Used%20Methods%20of%20Java%20HashMap.md) HashMap常用方法。例如，按值排序

Deep understanding of Arrays.sort(T[], Comparator < ? super T > c)

[How do developers sort?](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/How%20Developers%20Sort%20in%20Java%3F.md) 常见排序，Collections、Arrays、TreeMap、TreeSet

[java.util.ConcurrentModificationException](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/java.util.ConcurrentModificationException.md)

## 4.2 Generics 泛型

Why do we need generic types?

Why do we need generic methods?

What is type erasure?

Set vs. Set>

What's the best way of converting Array to ArrayList?

## 5. Exceptions

How exception handling works?

Class hierarchy of exceptions

## 6. Concurrency

Monitors – the key idea of Java synchronization

How to make a method thread-safe?

join()

notify() and wait()

Create thread by overriding

## 7. I/O & Database

Read file line by line

Write file line by line

FileOutputStream vs. FileWriter

Should .close() be put in finally block or not?

Java serialization

How to use properties file?

##8. Compiler and JVM

JVM run-time data areas

How does Java handle aliasing？

What does an array look like in memory?

What is memory leak?

What can be learned from "Hello World"?

Whan and how a class is loaded and initialized?

Static type checking

Generate code for overloaded and overridden methods?

## 9. Top collections

Top 10 mistakes Java developers make

[Top 10 methods for Java arrays](https://github.com/Yixiaohan/simple-java-zh-CN/blob/master/content/Top%2010%20Methods%20for%20Java%20Arrays.md) 数组常用方法

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