李偉canvas從入門到放飛自我
? ? ? ?public BookBuilder withThanks(String thanks) {
? ? ? ? ? ?this.thanks = thanks;
? ? ? ? ? ?return this;
? ? ? ?}
? ? ? ?public Book build() {
? ? ? ? ? ?Book book = new Book();
? ? ? ? ? ?book.head = this.head;
? ? ? ? ? ?book.preface = this.preface;
? ? ? ? ? ?book.thanks = this.thanks;
? ? ? ? ? ?book.content = this.content;
? ? ? ? ? ?return book;
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