java实验7.1（CollegeCourse.java）

Write a program called CollegeCourse that computes the cost of taking a college course. Include a constructor that requires a course ID number. Add a subclass Lab to compute a lab fee for a course that uses a lab. Write a program UseCourse to use the classes. Save the progras as CollegeCourse, Lab, and UseCourse. Put them all in a package called edu.ynu.lab7. Hints: how to compile and run your programs in the DOS environment, if using Jcreator you don't have to worry about this (suppose you put all your work under c:\java\lab7) Compile the classes by using the command: javac -d c:\java\lab7\*.java Run the example by going to c:\java\lab7 and typing: java ynu/edu/lab7/UseCourse For example, the output could be: The cost of your course is $180.0 there is a $25.00 lab fee. The cost of your course is $205.0 Program 2 Create an abstract Auto class with fields for the car make and price. Include get and set methods for these fields; the setPrice() method is abstract. Create two suclasses for individual automobile makers (for example, Ford and Chevy) and include appropriate setPrice() methods in each subclass. Finally, write a program that uses the Auto class and subclasses to display information about different cars. The java programs should be named like: Auto.java Ford.java Chevy.java UseAuto.java Sample Output: A new Ford costs $20000.0 A new Chevy costs $22000.0