Java 嵌套类

Category: Java 常见问题

静态内部类，非静态内部类

We recently have used SonarQube to do the code coverage. And when I checked the issue Sonar gave. I found that I have to learn more about the static nested class and non-static nested classes.

If you define the following class.

class OuterClass {
	...
	class InnerClass {
		...
	}
}

特性：

• The instance of InnerClass can only exist within the instance of OuterClass
• the OuterClass has direct access to the methods and fields of its inner instance.
• If you want to instantiate an inner class, you must instantiate the outer class.