How to instantiate non static inner class within a static method?

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今天写了一段这样的代码，然后报错了
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public class ceshi2 {

    class Student{
        private String name;
        private Integer age;
    }

    public static void main(String[] args) {
        Student student=new Student();

    }
}

You have to have a reference to the other outer class as well.

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Inner inner = new MyClass().new Inner();

If Inner was static then it would be

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Inner inner = new MyClass.Inner();
What is a static class in Java?

You cannot use the static keyword with a class unless it is an inner class. A static inner class is a nested class which is a static member of the outer class. It can be accessed without instantiating the outer class, using other static members.

参考：https://stackoverflow.com/questions/12690128/how-to-instantiate-non-static-inner-class-within-a-static-method

https://www.tutorialspoint.com/What-is-a-static-class-in-Java