book.java

来自「程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件」· Java 代码 · 共 28 行

package examples.inheritance;

class ReadingMatter {

   boolean available_online;  // false by default
   String title;

   public ReadingMatter() {
      this.title = "TBA";
   }

   public ReadingMatter( String title ) {
      this.title = title;
   }
}

public class Book extends ReadingMatter {

   String author;
   int numPages;

   public Book( String title, String author,
                int numPages ) {
      super( title );
      this.numPages = numPages;
      this.author = author;
   }
}