设计一个book类，包含图书作者，书名，出版社，单价属性，两个构造方法（一个带参一个不带参

public class Book {

public Book(){

}

public Book(String author,String bookName,String publishing,Double price){
this.author = author;
this.bookName = bookName;
this.publishing = publishing;
this.price = price;
}

private String author;
private String bookName;
private String publishing;
private Double price;
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getPublishing() {
return publishing;
}
public void setPublishing(String publishing) {
this.publishing = publishing;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public void printBook(){
System.out.print("作者："+book.getAuthor);
System.out.print("书名："+book.geBookName);
System.out.print("出版时间："+book.gePublishing);
System.out.print("单价："+book.getPrice);
}
public static void main(String[] args) {

Book book = new Book("AAA","J2EE","清华出版社",28);
book.printBook();

}
}

public class Book {

public Book(){

}

public Book(String author,String bookName,String publishing,Double price){
this.author = author;
this.bookName = bookName;
this.publishing = publishing;
this.price = price;
}

private String author;
private String bookName;
private String publishing;
private Double price;
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getPublishing() {
return publishing;
}
public void setPublishing(String publishing) {
this.publishing = publishing;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}

public String printBook(){

return "book message: [author = "+author+"],[bookName = "+bookName+"],[publishing = "+publishing+"],[price = "+price+"]";
}

public static void main(String[] args) {

Book book1 = new Book();
String bookmsg1 = book1.printBook();
System.out.println(bookmsg1);

Book book2 = new Book("someone","Java","someplace",new Double(30));
String bookmsg2 = book2.printBook();
System.out.println(bookmsg2);

}
}

这些东西还是自己写的好！