2021-04-11

import java.util.Scanner;

public class tushu {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

//初始化书本信息

String[] bookNames = new String[6];

int[] borrowDates = new int[6];

int[] borrowCounts = new int[6];

int[] states = new int[6];

//初始化三本书

bookNames[0] = "安徒生童话";

borrowDates[0] = 15;

borrowCounts[0] = 16;

states[0] = 0;//0:可借阅 1：已借出

bookNames[1] = "格林童话";

borrowDates[1] = 0;

borrowCounts[1] = 0;

states[1] = 1;//0:可借阅 1：已借出

bookNames[2] = "Java开发";

borrowDates[2] = 0;

borrowCounts[2] = 0;

states[2] = 0;//0:可借阅 1：已借出

int num = -1;//初始化用户输入的数字

boolean flag = true;//true:不退出系统 false:退出系统

do{

System.out.println("************欢迎使用MiNi图书管理系统**********");

System.out.println("\t\t\t\t\t1.新增图书");

System.out.println("\t\t\t\t\t2.查看图书");

System.out.println("\t\t\t\t\t3.借阅图书");

System.out.println("\t\t\t\t\t4.归还图书");

System.out.println("\t\t\t\t\t5.删除图书");

System.out.println("\t\t\t\t\t6.退出系统");

System.out.print("\n请选择：");

int choose = sc.nextInt();

while(choose<0 || choose>6){

System.out.print("输入有误，重新输入：");

choose = sc.nextInt();

}

switch(choose){

case 1:

System.out.println("************1.新增图书**********");

System.out.print("请输入新增图书的名字：");

String addBook = sc.next();

boolean isAdd = false;//false:不能添加图书 true：可以添加图书

//遍历数组，查找新增图书的位置

for(int i =1;i<bookNames.length;i++){

//数组没满，可以新增图书

if(bookNames[i] == null){

isAdd = true;

bookNames[i] = addBook;

System.out.println("新增图书成功！！！");

break;

}else{

isAdd = false;

}

//循环遍历输出数组内图书信息

for(int i = 0;i<bookNames.length;i++){

//如果为空，不输出

if(bookNames[i] != null){

String state = (states[i]==0)?"可借阅":"已借出"; //把借阅状态的0 1 变成易看的“可借阅已借出”

String borrowCount = borrowCounts[i]+"次";

String borrowDate = borrowDates[i] + "日";

System.out.println((i+1)+"\t\t"+bookNames[i]+"\t\t"+state+"\t\t"+

borrowCount+"\t\t"+borrowDate);

}

if(!isAdd){

System.out.println("对不起，图书已满，不能新增！");

break;

}

break;

case 2:

System.out.println("2.查看图书");

System.out.println("序号"+"\t\t\t"+"书名"+"\t\t\t"+"借阅状态"+"\t\t"+"借阅次数"+

"\t\t"+"借阅日期");

//循环遍历输出数组内图书信息

for(int i = 0;i<bookNames.length;i++){

//如果为空，不输出

if(bookNames[i] != null){

String state = (states[i]==0)?"可借阅":"已借出"; //把借阅状态的0 1 变成易看的“可借阅已借出”

String borrowCount = borrowCounts[i]+"次";

String borrowDate = borrowDates[i] + "日";

System.out.println((i+1)+"\t\t"+bookNames[i]+"\t\t"+state+"\t\t"+

borrowCount+"\t\t"+borrowDate);

}

break;

case 3:

System.out.println("3.借阅图书");

System.out.print("请输入您要借阅图书的名字：");

String borrowName = sc.next();

boolean isBorrow = false;//true:能借阅

for(int i = 0;i<bookNames.length;i++){

//如果可以找到书，且书的状态是可借阅，就可以借阅

if(bookNames[i] != null && bookNames[i].equals(borrowName) && states[i] == 0){

isBorrow = true;

//输入借阅日期

System.out.print("请输入借阅的日期：");

int borrowRiQi = sc.nextInt();

//判断输入的借阅日期是否合法

while(borrowRiQi < 1 || borrowRiQi > 31){

System.out.print("输入有误，重新输入：");

borrowRiQi = sc.nextInt();

}

System.out.println("借阅成功！！！");

//更改借阅日期

borrowDates[i] = borrowRiQi;

//更新借阅状态

states[i] = 1;

//更新借阅次数

borrowCounts[i]++;

break;

}else if(bookNames[i] != null && bookNames[i].equals(borrowName) && states[i] == 1){

//如果可以找到书，且书的状态是已借出，不能借阅

isBorrow = true;

System.out.println("书已经借出，不能重复借阅！");

break;

}

if(!isBorrow){

//bookNames[i] == null,说明找不到书

System.out.println("抱歉，找不到该书！！！");

break;

}

break;

case 4:

System.out.println("4.归还图书");

System.out.print("请输入您要归还图书的名字：");

String returnName = sc.next();

boolean isReturn = false;//true:能归还

for(int i = 0;i<bookNames.length;i++){

//如果可以找到书，且书的状态是已借出，就可以归还

if(bookNames[i]!=null && bookNames[i].equals(returnName) && states[i] == 1){

isReturn = true;

//输入归还日期

System.out.print("请输入归还的日期：");

int returnRiQi = sc.nextInt();

//判断输入的归还日期是否合法

while(returnRiQi < 1 || returnRiQi > 31 || returnRiQi<borrowDates[i]){

//输入的归还日期不合法

if(returnRiQi < 1 || returnRiQi > 31){

System.out.print("输入的日期有误，重新输入：");

returnRiQi = sc.nextInt();

}else if(returnRiQi<borrowDates[i]){

System.out.print("归还日期必须大于借阅日期，从新输入：");

returnRiQi = sc.nextInt();

}

System.out.println("归还成功！！！");

states[i] = 0;

break;

}else if(bookNames[i]!=null && bookNames[i].equals(returnName) && states[i] == 0){

//如果可以找到书，且书的状态是可借阅，不能归还

isReturn = true;

System.out.println("书可借阅，不能归还！");

break;

}

if(!isReturn){

//bookNames[i] == null.说明找不到书，不可以归还

System.out.println("抱歉，不是本图书馆的书，不用归还！！！");

break;

}

break;

case 5:

System.out.println("5.删除图书");

System.out.print("请输入您要删除图书的名字：");

String deleteName = sc.next();

boolean isDelete = false;//true:能删 false:不能删

for(int i = 0;i<bookNames.length;i++){

if(bookNames[i] != null && bookNames[i].equals(deleteName) && states[i] == 1){

//如果可以找到书，且书的状态是已借出，不能删除

isDelete = true;

System.out.println("书已借出，不能删除！");

break;

}else if(bookNames[i] != null && bookNames[i].equals(deleteName) && states[i] == 0){

//如果可以找到书，且书的状态是可借阅，可以删除

isDelete = true;

//初始化呢index，用来记录下需要删除的位置

int index = -1;

if(bookNames[i].equals(deleteName)){

index = i;

}

//判断index是-1还是i

if(index != -1){

//index不是-1，说明找到了图书，可以删除

for(i = index;i<bookNames.length-1;i++){

//从下标index1开始，后面的整体向前移一位

bookNames[i] = bookNames[i+1];

borrowDates[i] = borrowDates[i+1];

borrowCounts[i] = borrowCounts[i+1];

states[i] = states[i+1];

//最后一位置空

bookNames[bookNames.length-1] = null;

borrowDates[bookNames.length-1] = 0;

borrowCounts[bookNames.length-1] = 0;

states[bookNames.length-1] = 0;//0:可借阅 1：已借出

}

System.out.println("删除图书成功！");

break;

}

if(!isDelete){

//bookNames[i] == null.说明找不到书，不能删除

System.out.println("不是本图书馆的书，不能删除");

break;

}

break;

case 6:

flag = false; //退出系统

break;

default:

flag = false; //退出系统

break;

}

if(flag){

System.out.print("\n输入0返回：");

num = sc.nextInt();

}else{

break;

}

}while(num == 0);

System.out.println("谢谢使用！！！");

}

2021-04-11

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