Book 类
public class Book implements Comparable<Book>{
private int id;
private String bookName;
private String author;
private double price;
public Book() {
super();
}
public Book(int id, String bookName, String author, double price) {
super();
this.id = id;
this.bookName = bookName;
this.author = author;
this.price = price;
}
public int getId() {
return id;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((bookName == null) ? 0 : bookName.hashCode());
result = prime * result + id;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Book other = (Book) obj;
if (bookName == null) {
if (other.bookName != null)
return false;
} else if (!bookName.equals(other.bookName))
return false;
if (id != other.id)
return false;
return true;
}
@Override
public String toString(){
return id +"\t"+ bookName + "\t"+ author +"\t"+ price ;
}
@Override
public int compareTo(Book o) {
return this.getId()-o.getId();
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public void setId(int id) {
this.id = id;
}
}
Library 类
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Scanner;
public class Library {
public static void main(String[] args) {
HashSet<Book> hashSet=new HashSet<>();
select(hashSet);
}
private static void select(HashSet<Book> hashSet) {
Scanner s=new Scanner(System.in);
boolean flag = true;
while (flag) {
System.out.println("***********功能列表************\n\t1.插入图书\n\t"
+ "2.删除图书\n\t3.修改图书\n\t4.查看图书\n\t5.退出\n请输入对应id(1-4)选择功能:");
String selection = s.next();
switch (selection){
case "1":
hashSet=addBook(hashSet);
break;
case "2":
deleteBook(hashSet);
break;
case "3":
changeBook(hashSet);
break;
case "4":
checkBook(hashSet);
break;
case "5":
flag = false;
break;
default:
System.out.println("输入错误，请重新输入!");
break;
}
}
}
private static HashSet<Book> addBook(HashSet<Book> hashSet) {
Scanner s = new Scanner(System.in);
boolean flag = true;
do {
System.out.println("插入图书：");
System.out.print("input bookId:");
int id=s.nextInt();
System.out.print("input bookName:");
String bookName=s.next();
System.out.print("input bookAuthor:");
String author=s.next();
System.out.print("input bookPrice");
double price=s.nextDouble();
hashSet.add(new Book(id, bookName, author, price));
System.out.println("是否继续插入Y/N?");
String isNext=s.next();
if (isNext.equalsIgnoreCase("n")){
System.out.println("插入完毕！");
flag = false;
checkBook(hashSet);
} else if (isNext.equalsIgnoreCase("y")){
System.out.println("继续插入");
}else{
System.out.println("输入错误，默认已退出！！！");
checkBook(hashSet);
flag = false;
}
} while (flag);
return hashSet;
}
private static HashSet<Book> deleteBook(HashSet<Book> hashSet) {
System.out.println("删除图书");
System.out.println("请输入要删除书籍的ID：");
Scanner s = new Scanner(System.in);
int deleteId=s.nextInt();
ArrayList<Book> arrayList=new ArrayList<>(hashSet);
Collections.sort(arrayList);
Iterator<Book> iterator=arrayList.iterator();
while (iterator.hasNext()){
Book b = (Book) iterator.next();
if(b.getId()==deleteId){
iterator.remove();
}
}
hashSet=new HashSet<Book>(arrayList);
checkBook(hashSet);
select(hashSet);
return hashSet;
}
private static void changeBook(HashSet<Book> hashSet) {
System.out.println("修改图书");
System.out.println("请输入要修改书籍的ID:");
Scanner s = new Scanner(System.in);
int alterId=s.nextInt();
ArrayList<Book> arrayList=new ArrayList<>(hashSet);
Collections.sort(arrayList);
Iterator<Book> iterator=arrayList.iterator();
while (iterator.hasNext()){
Book b=(Book) iterator.next();
if(b.getId()==alterId){
System.out.print("请输入要修改的书籍的名字：");
String bookName = s.next();
b.setBookName(bookName);
System.out.print("请输入要修改的书籍作者的名字：");
String author = s.next();
b.setAuthor(author);
System.out.print("请输入要修改的书籍的价格：");
Double price = s.nextDouble();
b.setPrice(price);
}
}
select(hashSet);
}
private static void checkBook(HashSet<Book> hashSet) {
System.out.println("=============查看图书==================");
System.out.println("id\tName\tauthor\tprice");
ArrayList<Book> arrayList=new ArrayList<>(hashSet);
Collections.sort(arrayList);
Iterator<Book> iterator=arrayList.iterator();
while (iterator.hasNext()){
Book book = (Book) iterator.next();
System.out.println(book);
}
System.out.println("=====================================");
}
}