英文:
Enclosing instance required that contains outerclass.innerclass
问题
Student.Student_Card obj4 = Student.new Student_Card(namess, idss, true);
Student类是外部类，Student_Card是嵌套类，在运行这段代码时，出现错误：
需要包含Student.Student_Card的封闭实例。
英文:
Student.Student_Card obj4 = Student.new Student_Card(namess, idss, true);
Student class is an outer class and Studen_Card is nested class,when i am running this code i am getting error that:
an enclosing instance that contains Student.Student_Card is required
答案1
得分: 1
你需要这样做：
Student.Student_Card obj4 = new Student.Student_Card(namess, idss, true);
英文:
You need to do it like this:
Student.Student_Card obj4 =new Student.Student_Card(namess, idss, true);
答案2
得分: 0
如果您想消除错误，请将内部类标记为static，如下所示：static class Student_Card
否则，请注意内部类需要外部类的实例，如下所示：
Student student = new Student();
Student_Card studentCard = student.new Student_Card();
英文:
If you want to get rid of the error, mark the inner class with static, as so: static class Student_Card
Otherwise, note that inner classes require an instance of the outer class, like so:
Student student = new Student();
Student_Card studentCard = student.new Student_Card()
答案3
得分: 0
如果你的Student_Card类不是静态的，那么你需要一个Student的实例来创建它。
Student student = new Student();
Student.Student_Card obj4 = student.new Student_Card(namess, idss, true);
如果你将Student_Card类设置为静态，那么你根本不需要引用Student类，下面的代码就可以工作：
Student.Student_Card card = new Student.Student_Card(namess, idss, true);
你可以在这个帖子中阅读更多。
英文:
If your Student_Card class is not static, then you need an instance of Student in order to create it.
Student student = new Student();
Student.Student_Card obj4 = student.new Student_Card(namess, idss, true);
If you will make class `Student_Card static, then you don't need any reference to your Student class at all, this will work:
Student.Student_Card card= new Student.Student_Card(namess, idss, true);
You can read more in this thread.
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