一.写主类
public class Message {
//属性
private String name;
private int state;
private int date;
private int count;//构造器
public Message() {
super();
}public Message(String name, int state, int date, int count) {
super();
this.name = name;
this.state = state;
this.date = date;
this.count = count;
}//get set 方法
public String getName() {
return name;
}public void setName(String name) {
this.name = name;
}public int getState() {
return state;
}public void setState(int state) {
this.state = state;
}public int getDate() {
return date;
}public void setDate(int date) {
this.date = date;
}public int getCount() {
return count;
}public void setCount(int count) {
this.count = count;
}}
二.初始化三本书
Scanner sc = new Scanner(System.in);
Message[] arr = new Message[6];
Message[] brr=new Message[4];
// 原本就已经被借的书,创建代码块。创建对象代码块里面执行
Message m1 = new Message("罗马假日", 1, 1, 15);
arr[0] = m1;
Message m2 = new Message("白雪公主", 0, 0, 12);
arr[1] = m2;
Message m3 = new Message("葫芦兄弟", 0, 0, 30);
arr[2] = m3;
三.完整图书管理系统代码
import java.util.Scanner;
public class Operate {
Scanner sc = new Scanner(System.in);
Message[] arr = new Message[6];
Message[] brr=new Message[4];
// 原本就已经被借的书,创建代码块。创建对象代码块里面执行
{
Message m1 = new Message("罗马假日", 1, 1, 15);
arr[0] = m1;
Message m2 = new Message("白雪公主", 0, 0, 12);
arr[1] = m2;
Message m3 = new Message("葫芦兄弟", 0, 0, 30);
arr[2] = m3;
}
boolean flag2 = false;
boolean flag3 = false;
public int start() {
System.out.println("欢迎使用迷你图书管理器");
System.out.println("-------------------------");
System.out.println("1.新增图书");
System.out.println("2.查看图书");
System.out.println("3.删除图书");
System.out.println("4.借出图书");
System.out.println("5.归还图书");
System.out.println("6.退出图书");
System.out.println("-------------------------");
System.out.println("请输入您想选择的序号");
int input = sc.nextInt();
return input;
}
public void choose(int input) {
switch (input) {
case 1:
// 新增图书
add();
break;
case 2:
//查看图书
look();
break;
case 3:
delete();
//删除图书
break;
case 4:
borrow();
//借出图书
break;
case 5:
//归还图书
revert();
break;
case 6:
System.out.println("退出系统");
break;
default:
System.out.println("您输入错误，请您重新输入");// 输入0时可以继续循环
break;
}
}
public boolean result() {
System.out.println("请输入一个数字，输入0时返回");
int i = sc.nextInt();
return i == 0 ? false : true;
}
public void add() {
System.out.println("-->新增图书\n");
System.out.println("请输入图书名称：");
String name = sc.next();
System.out.println("请输入借阅状态");
int jie = sc.nextInt();
while (jie < 0 || jie > 1) {
System.out.println("您输入错误请重新输入");
jie = sc.nextInt();
}
System.out.println("请输入借出日期");
int ri = sc.nextInt();
while (jie < 0 || jie > 30) {
System.out.println("您输入错误请重新输入");
ri = sc.nextInt();
}
System.out.println("请输入借出次数");
int ci = sc.nextInt();
for (int i = 0; i < arr.length; i++) {
if (arr[i] == null) {
flag2 = true;
Message message = new Message(name, jie, ri, ci);
arr[i]=message;
System.out.println("添加成功名字是：" + name);
System.out.println("请输入借阅状态" + jie);
System.out.println("请输入借出日期" + ri);
System.out.println("请输入借出次数" + ci);
break;
}
}
if (!flag2) {
System.out.println("抱歉,新增《" + name + "》失败！货架已满！");
}
}
public void look() {
System.out.println("查看图书");
System.out.println("序号\t状态\t名称\t借出日期\t借出次数");
for (int i = 0; i < arr.length; i++) {
if (arr[i] != null) {
String BookState = (arr[i].getState() == 0) ? "可借阅" : "已借出";
String dateStr = (arr[i].getDate() == 0) ? "" :
(arr[i].getDate() + "日");
System.out.println((i + 1) + "\t" + BookState + "\t"
+ arr[i].getName() + "\t" + dateStr + "\t"
+ arr[i].getCount() + "次");
}
}
}
public void delete(){
System.out.println("-->删除图书\n");
System.out.println("请输入要删除图书的序号：");
int delete=sc.nextInt();
int index=-1;
for(int i=0;i<arr.length;i++){
if(arr[i]!=null&&arr[i].getState()==0&&delete==i+1){
index=i;
break;
}else if(arr[i]!=null&&arr[i].getState()!=0&&delete==i+1){
System.out.println("该图书已被借出，目前无法删除！");
break;
}
}
if(index!=-1){
for(int j=index+1;j<arr.length;j++){
arr[j-1]=arr[j];
}
System.out.println("图书删除成功！");
}
}
public void borrow(){
System.out.print("请输入想借图书名字：");
String want=sc.next();
System.out.println("请输入要借的日期,日期不能超过三十天");
int day=sc.nextInt();
while(day<0||day>30){
System.out.println("您输入错误，请您重新输入");
day=sc.nextInt();
}
for(int i=0;i<arr.length;i++){
if(arr[i]==null){
System.out.println("没有这本书，借书失败");
break;
}
if(want.equals(arr[i].getName())&&arr[i].getState()==0){
flag3=true;
arr[i].setState(1);
arr[i].setDate(day);
System.out.println("恭喜您，借书成功");
break;
}else if(want.equals(arr[i].getName())&&arr[i].getState()==1){
flag3=true;
System.out.println("已经被借出，不能再次外借");
break;
}
}
}
public void revert(){
System.out.print("请输入归还图书名称：");
String want1=sc.next();
for(int i=0;i<arr.length;i++){
if(arr[i]==null){
System.out.println("没有找到匹配信息！");
break;
}else if(want1.equals(arr[i].getName())&&arr[i].getState()==1){
arr[i].setState(0);
System.out.print("请输入归还日期：");
int redate = sc.nextInt();
while (redate < arr[i].getDate() || redate > 31) { // 归还日期不能小于借出日期，也不能大于31
if (redate < arr[i].getDate()) {
System.out.println("归还日期不能小于借出日期，请重新输入：");
} else {
System.out.println("一个月只有31天，请重新输入：");
}
redate = sc.nextInt();
}
System.out.println("\n归还《" + want1 + "》成功！");
System.out.println("借出日期为：" + arr[i].getDate() + "日");
System.out.println("归还日期为：" + redate + "日");
break;
}else if(want1.equals(arr[i].getName())&&arr[i].getState()==0){
System.out.println("该图书没有被借出!无法进行归还操作。");
break;
}
}
}
}
四.测试
public class Test {
public static void main(String[] args) {
Operate o=new Operate();
do{
int start=o.start();
o.choose(start);
}while(!o.result());
}
}