使用类和对象、方法、循环、List、泛型来实现简单的图书管理系统

Book.java


import java.util.List;
import java.util.Scanner;
public class Book {

    private String name;
    private String author;

    Scanner scanner = new Scanner(System.in);
  //  List booklist = new ArrayList<>();      这句没有 因为如果有了 我book中函数查的booklist和主函数是两个list

    public boolean select(String findname, List booklist) {

        boolean a = true;
        for (Object book : booklist) {

            if (((Book)book).name.equals(findname)) {

                a = false;
                System.out.println("找到了书籍!");
                return !a;
            }

        }
        if (a) {

            System.out.println("此书不存在!");
            return !a;
        } else {
            return a;
        }
    }


    public Book() {
    }

    public Book(String name, String author) {
        this.name = name;
        this.author = author;
    }


    @Override
    public String toString() {
        return "Book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

}

MainClass.java


import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class MainClass {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        Book booksystem  = new Book();
        List booklist = new ArrayList<>();        //新建booklist

        while (true){

            System.out.println("---------------图书管理系统---------------");
            System.out.println("1. 增加图书");
            System.out.println("2. 查找图书");
            System.out.println("3. 修改图书");
            System.out.println("4. 删除图书");
            System.out.println("5. 列出所有图书");
            System.out.println("6. 退出系统");
            System.out.println("----------------------------------------");
            System.out.println("请输入选择的功能:");

            int i = scanner.nextInt();
            if (i == 1){

                System.out.println("请输入新的书名");
                String bookname = scanner.next();       //获取输入的书名

                System.out.println("请输入书的作者");
                String bookauthor = scanner.next();     //获取输入的作者名

                Book newbook = new Book(bookname,bookauthor);

                booklist.add(newbook);

                System.out.println("添加成功");

            } else if (i == 2){

                System.out.println("请输入想要查找的书名");
                String findname = scanner.next();       //获取想要查找的名

                booksystem.select(findname,booklist);

            } else if (i == 3){

                System.out.println("请输入想要修改的书名");
                String wantname = scanner.next();

                boolean bool = booksystem.select(wantname,booklist);

                if (bool){

                    for (Book book : booklist) {

                        if (book.getName().equals(wantname)){

                            System.out.println("请输入图书的新名字:");
                            String altername = scanner.next();

                            book.setName(altername);
                            System.out.println("此书已修改!!");

                            break;
                        }
                    }
                }
            }
            else if (i == 4){

                System.out.println("请输入想要删除的书名");
                String deletename = scanner.next();

                boolean bool = booksystem.select(deletename,booklist);

                if (bool){

                    for (Book book : booklist) {

                        if (book.getName().equals(deletename)){

                            booklist.remove(book);
                            System.out.println("此书已删除!!");
                            break;
                        }
                    }

                }
            }
            else if (i == 5){

                for (Object o : booklist) {

                    System.out.println(o);
                }


            } else if (i == 6){
                System.out.println("----------您已退出系统----------");
                break;
            }
        }
    }
}

删除的标准写法：迭代器
我的写法不规范会有问题建议使用迭代器


public void deleteBooks() {
        System.out.println("请输入要删除的书籍名:");
        String delName = this.input.next();
        Iterator bookIterator = this.bookList.iterator();

        while(bookIterator.hasNext()) {
            Book book = (Book)bookIterator.next();
            if (book.getName().equals(delName)) {
                System.out.println("找到图书");
                bookIterator.remove();
                System.out.println("成功删除!");
            }
        }
    }