package com.company;
import java.util.Scanner;
public class BookManage {
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] = "java基础教程";
borrowDates[0] = 20150701;
borrowCounts[0] = 0;
states[0] = 0;//0:可借阅 1：已借出
bookNames[1] = "数据库技术";
borrowDates[1] = 0;
borrowCounts[1] = 1;
states[1] = 1;//0:可借阅 1：已借出
bookNames[2] = "人月神话";
borrowDates[2] = 0;
borrowCounts[2] = 1;
states[2] = 1;//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 //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 //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 //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 //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(bookNames[i] == null) //if(!bookNames[i].equals(borrowName)) }/*else if(bookNames[i] == null){ isBorrow = false; 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 //if(!bookNames[i].equals(borrowName)) /*if(bookNames[i] == null){ //找不到书 isReturn = false; break; }else*/ //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 //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 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！！！"); //更新借阅状态 states[i] = 0; /*//更新借阅次数 borrowCounts[i]++;*/ 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 /*//if(!bookNames[i].equals(borrowName)) if(bookNames[i] == null){ //找不到书，不能删 isDelete = false; break; }else*/ 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 //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！！！"); } }