【笔记】Eclipse and Java for Total Beginners—016

Lesson 16 – Create main Method and JAR File

• Introduce main method
• Write a main method
• Run MyLibrary as Java application
• Export to JAR file and run from Windows

在MyLibrary.java里添加main method。

  
    

   
      1 
   
     public
   
      
   
     static
   
      
   
     void
   
      main(String[] args) {

   
      2 
   
      
   
     //
   
      create a new MyLibrary
   
     

   
      3 
   
      
   
      MyLibrary testLibrary 
   
     =
   
      
   
     new
   
      MyLibrary(
   
     "
   
     Test Drive Library
   
     "
   
     );

   
      4 
   
      Book b1 
   
     =
   
      
   
     new
   
      Book(
   
     "
   
     War and Peace
   
     "
   
     );

   
      5 
   
      Book b2 
   
     =
   
      
   
     new
   
      Book(
   
     "
   
     Great Expectations
   
     "
   
     );

   
      6 
   
      b1.setAuthor(
   
     "
   
     Tolstoy
   
     "
   
     );

   
      7 
   
      b2.setAuthor(
   
     "
   
     Dickens
   
     "
   
     );

   
      8 
   
      Person jim 
   
     =
   
      
   
     new
   
      Person();

   
      9 
   
      Person sue 
   
     =
   
      
   
     new
   
      Person();

   
     10 
   
      jim.setName(
   
     "
   
     Jim
   
     "
   
     );

   
     11 
   
      sue.setName(
   
     "
   
     Sue
   
     "
   
     );

   
     12 
   
      

   
     13 
   
      testLibrary.addBook(b1);

   
     14 
   
      testLibrary.addBook(b2);

   
     15 
   
      testLibrary.addPerson(jim);

   
     16 
   
      testLibrary.addPerson(sue);

   
     17 
   
      

   
     18 
   
      System.out.println(
   
     "
   
     Just creat new library
   
     "
   
     );

   
     19 
   
      testLibrary.printStatus();

   
     20 
   
      

   
     21 
   
      System.out.println(
   
     "
   
     Check out War and Peace to Sue
   
     "
   
     );

   
     22 
   
      testLibrary.checkOut(b1, sue);

   
     23 
   
      testLibrary.printStatus();

   
     24 
   
      

   
     25 
   
      System.out.println(
   
     "
   
     Do some more stuff
   
     "
   
     );

   
     26 
   
      testLibrary.checkIn(b1);

   
     27 
   
      testLibrary.checkOut(b2, jim);

   
     28 
   
      testLibrary.printStatus();

   
     29 
   
      

   
     30 
   
      }

   
     31 
   
     

   
     32 
   
      
   
     private
   
      
   
     void
   
      printStatus() {

   
     33 
   
      

   
     34 
   
      System.out.println(
   
     "
   
     Status Report of MyLibrary \n
   
     "
   
      
   
     +
   
      

   
     35 
   
      
   
     this
   
     .toString());

   
     36 
   
      
   
     for
   
      (Book thisBook : 
   
     this
   
     .getBooks()) {

   
     37 
   
      System.out.println(thisBook);

   
     38 
   
      

   
     39 
   
      }

   
     40 
   
      

   
     41 
   
      
   
     for
   
      (Person p : 
   
     this
   
     .getPeople()) {

   
     42 
   
      
   
     int
   
      count 
   
     =
   
      
   
     this
   
     .getBooksForPerson(p).size();

   
     43 
   
      System.out

   
     44 
   
      .println(p 
   
     +
   
      
   
     "
   
      (has 
   
     "
   
      
   
     +
   
      count 
   
     +
   
      
   
     "
   
      of my books)
   
     "
   
     );

   
     45 
   
      

   
     46 
   
      }

   
     47 
   
      System.out.println(
   
     "
   
     Books Available: 
   
     "
   
     

   
     48 
   
      
   
     +
   
      
   
     this
   
     .getAvailableBooks().size());

   
     49 
   
      System.out.println(
   
     "
   
     --- End of Status Report ---
   
     "
   
     );

   
     50 
   
      

   
     51 
   
      

   
     52 
   
      }