说明：  “如果您有一本Java方面的书，那它应当是《21天学通Java 2》。”——PC Magazine。《21天学通Java 2》是公认的十大Java经典图书之一，本书对任何层次的Java爱好者来说都是绝对值得学习和收藏的。
(" If you have a Java books on, then it should be" 21 days Xue-tong Java 2 " 。" -- PC Magazine. " 21 Days pass Java 2" is recognized as one of the top ten Java classic book, this book for any level of Java lovers are definitely worth learning and collections.)