Topic analysis

With the idea of object-oriented, write a self defining class to describe the book information. The set attributes include: book name, author, publisher name, price; set the private access rights of the attribute, and access to the attribute through the public get and set methods] (here write the custom directory title)

task

Property: title, author, publishing house, price
Method: information introduction

Requirement:

1. Design constructors to realize attribute assignment
2. Set private property and get/set method to access property
3. The price of the limited book must be greater than 10. If it is invalid, a prompt shall be given and the forced value shall be 10
4. Limit the author and title to read-only
5. Information introduction method describes all information of the book

The code is as follows:

public class Book {
	// Private property: title, author, publishing house, price
	private String bookname;
	private String zzname;
	private String cbs;
	private double jg;

	// Property assignment by construction method
	public Book() {

	}

	public Book(String bookname, String zzname, String cbs, double jg) {
		this.bookname = bookname;
		this.zzname = zzname;
		this.cbs = cbs;
		this.jg = jg;
	}
	/*
	 * The public get/set method is used to access the properties, where:
	 *  1,The price of the limited book must be greater than 10. If it is invalid, you need to prompt and force the value to 10 
	 * 2,Restrict the author and title to read-only
	 */

	public String getCbs() {
		return cbs;
	}

	public void setCbs(String cbs) {
		this.cbs = cbs;
	}

	public double getJg() {
		return jg;
	}

	public void setJg(double jg) {
		if (jg > 10) {
			this.jg = jg;
		} else {
			System.out.println("The lowest price of books is 10 yuan");
			this.jg = 10;
		}
	}

	public String getBookname() {
		return bookname;
	}

	public String getZzname() {
		return zzname;
	}

	public void setBookname(String bookname) {
		this.bookname = bookname;
	}

	public void setZzname(String zzname) {
		this.zzname = zzname;
	}

//Information introduction method, describing all information of the book

	public void showInfo() {

		System.out.println("Title:" + this.getBookname());

		System.out.println("author:" + this.getZzname());

		System.out.println("Press::" +cbs);

		System.out.println("Price:" + jg+"element");

	}
}

public class BookTest {

    // test method
	 public static void main(String[] args) {
		
     //Instantiate the object and call related methods to achieve the running effect
    Book n =new Book("The Dream of Red Mansion", "Cao Xueqin", "People's Literature Press", 10.0);
    n.showInfo();
    System.out.println("==============");
    Book m =new Book("knife man", "Gulong", "China Chang'an press", 55.5);
    m.showInfo();
	 }
}

Operation result: