maoruibin / maoruibin/maoruibin.github.com
Java 内部类
Nobody has claimed this yet.
- Dominant language
- HTML
- Stars
- 22
- Forks
- 4
- PR merge metrics
- No merged PRs in 30d
Description
关于内部类更详细的解释 https://www.jianshu.com/p/f897100a09fc
Java 类中，每一个类都会有一个默认构造方法叫 init 。
Java 中可以在类中继续定义一个类，这个类就叫做内部类。如下，在外部类 Outer 中创建了一个名为 Inner 的 Class，它就叫做 Outer 的内部类。
在 Java 的内部类中，内部类是可以访问外部类属性的，这是一开始学 Java 时大家都知道的，但是这里要问的是，这个机制是如何做到的？
在 非静态内部类中，这个内部类会默认持有一个外部类的实例，所以当我们访问外部类对象时，其实是通过这个默认实例来访问的。
public class Outer {
private String name;
class Inner{
void test(){
System.out.print("name is "+name);
}
}
}
那这个外部类的实例叫什么？
this$0
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the linked Jianshu article and the Java example in the issue, then verify how a non-static inner class accesses its enclosing instance. Document what the synthetic this$0 reference represents and how the mechanism works; the issue is complete when the explanation answers that question clearly.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100