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为我的 CS 课创建一个程序，基本上一个程序（由我的导师创建）创建了一个制作书名和作者的程序，然后代码将通过我的程序运行，该程序将构建一个 Book Class 和 Author Class 以确保它们可操作我的问题是，在我的书类中调用了作者代码“a3”的第 12 行，我不知道如何在我的第二类构造函数中调用我的第一类。正如我收到一个错误，上面写着“期望三点”。

//my code

public class Author {
  String firstName;
  String lastName;
  //variables
  public Author (String a) {
    firstName = a;
  }
  public Author (String a, String b) {
    firstName = a;
    lastName = b;
  }
}


public class Book {
  String Title;
  String a;
  //variables
  public Book (String c, Author) {
    Title = c;
  }
  public Book () {
  }
}





// instructor's code

  void setup() { 
  Book [] allTheBooks = new Book[30]; 
  int score = 6; 
  int tScore = 0;

  System.out.println( "Attempting constructors:" );

  Author a1 = new Author( "Ballard", "J.G." );
  Author a2 = new Author( "Eggers", "Dave" );
  Author a3 = new Author( "Catton", "Eleanor" );
  Author a4 = new Author( "Adler", "Renata" );


  System.out.println( "  - Author constructors seem functional:  3/3" );



  allTheBooks[1] = new Book( "The Circle" );
  allTheBooks[2] = new Book( "The Luminaries", a3 );
  allTheBooks[3] = new Book();
  allTheBooks[4] = new Book( "Pitch Dark" );
  allTheBooks[5] = new Book( "Speedboat" );
  allTheBooks[6] = new Book();
  allTheBooks[7] = new Book( "The Dissident Gardens" );

  System.out.println( "  - Book constructors seem functional:    3/3" );
}
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