Java Inner Class(內部類別)

public class InnerClassDemo {

 class Student{
  void print(){
   System.out.println("This is an inner class as an instance variable");
  }
 }
 
 void classInAmethod(){
  class Son{
   void print(){
    System.out.println("I am within a method");
   }
  }
  Son s = new Son();
  s.print();
 }
 
 public static void main(String[]args){
  InnerClassDemo is = new InnerClassDemo();
  is.classInAmethod();
  InnerClassDemo.Student s = is.new Student();
  s.print();
 }

}

資料來源:http://docs.oracle.com/javase/tutorial/java/javaOO/innerclasses.html
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