java 图书馆初级编写
2024-09-06 21:06:14
import java.util.Scanner;
import java.util.Arrays;
public class book {
public static void main(String[] args){
//初始化数据
String[] bookName = {"西游记", "红楼梦", "三国演义", "水浒传","海贼王",null};
String[] state = {"可借","可借","可借","可借","可借","可借"};
int[] count = {0,0,0,0,0,0};
int num;
do {
System.out.println("欢迎使用图书借阅系统");
System.out.println("-------------------------------");
System.out.println("1.查看图书");
System.out.println("2.新增图书");
System.out.println("3.删除图书");
System.out.println("4.借阅图书");
System.out.println("5.归还图书");
System.out.println("6.退出图书");
System.out.println("-------------------------------");
System.out.println("请选择：");
Scanner scanner = new Scanner(System.in);
num = scanner.nextInt();
//打印输入的值
//System.out.println(num);
switch(num) {
case 1:
System.out.println("---》查看图书");
System.out.println("序号\t\t名称\t\t状态\t\t借出次数");
//int i = 1;
for(int i = 1; i<=bookName.length; i++) {
System.out.print(i);
System.out.print("\t\t"+bookName[i-1]);
System.out.print("\t\t"+state[i-1]);
System.out.println("\t\t"+count[i-1]);
}
/*
for(String name:bookName) {
System.out.print(i);
System.out.print("\t\t"+name);
System.out.print("\t\t"+state[i-1]);
System.out.println("\t\t"+count[i-1]);
i++;
}*/
break;
case 2:
System.out.println("---》新增图书");
//判断数组中是否有位置增加书名
if(bookName[bookName.length-1] == null) {
System.out.println("请输入书名：");
String name = scanner.next();
//检测数组中是否已经存在该书名
//int index = Arrays.binarySearch(bookName, name);
//默认数组中没有用户输入的书
boolean flag = false; for(String name2:bookName) {
if(name.equals(name2)){
flag = true;
break;
}
}
if(flag) {
System.out.println("《"+name+"》"+"书名已经存在");
break;
}else{
for(int i = 0; i < bookName.length; i++) {
if(bookName[i] == null) {
bookName[i] = name;
break;
}
} System.out.println("已添加该书名");
} }else{
System.out.println("-----书架已满-----"); }
break;
case 3:
System.out.println("----》删除图书");
//遍历图书
for(int i = 1; i<=bookName.length; i++) {
System.out.print(i);
System.out.println("\t"+bookName[i-1]);
}
//检测书架是否为空
boolean flag = false;
for(String name2:bookName) {
if(name2 != null){
flag = true;
break; }
} if(flag) {
System.out.println("-------请输入你要删除的书名------");
String name = scanner.next();
boolean flag2 = false; //证明该书是否存在
for(String name2:bookName) {
if(name.equals(name2)) {
flag2 = true;
break;
}
}
if(flag2) {
//找到被删除的书的数组下标
int index = 0;
for(int i = 0; i< bookName.length; i++) {
if(name.equals(bookName[i])) {
index = i;
break;
}
}
//index之后的数据往前提
for(int i = index; i < bookName.length-1; i++) {
bookName[i] = bookName[i+1];
}
//将数组最后一位置为null
bookName[bookName.length-1] = null;
System.out.println("删除成功");
}else{
System.out.println("该书不存在");
} }else {
System.out.println("-------空书架-------");
}
//for(int i = 1; i<=bookName.length; i++) {
// System.out.print(i);
// System.out.println("\t"+bookName[i-1]);
//}
//num = scanner.nextInt();
//bookName[num-1] =null;
break;
case 4:
System.out.println("借阅图书");
//1.检测bookName是否为空
flag = false;
for(String name:bookName) {
if(name != null) {
flag = true;
break;
}
}
if(flag) {
//2.检测用户输入的书是否存在
System.out.print("请输入你要借阅的书名：");
String name = scanner.next();
boolean flag2 = false;
for(String name2:bookName) {
if(name.equals(name2)) {
flag2 = true;
break;
}
}
if(flag2) {
//将图书对应的状态改为已借
int index = 0;
for(int i = 0; i < bookName.length; i++) {
if(name.equals(bookName[i])) {
index = i;
break;
}
}
//判断该书的状态
if(state[index].equals("已借出")) {
System.out.println("------该图书已借出------");
}else{
state[index] = "已借出";
//将图书对应的借出数量加
count[index] = ++count[index];
System.out.println("该书已借阅成功");
}
}else{
System.out.println("你输入的书名不存在");
}
}else{
System.out.println("书架已空，没有可以借阅的书籍");
}
break;
case 5:
System.out.println("----》归还图书");
//2.检测用户输入的书是否存在
System.out.print("请输入你要归还的书名：");
String name = scanner.next();
boolean flag2 = false;
for(String name2:bookName) {
if(name.equals(name2)) {
flag2 = true;
break;
}
}
if(flag2) {
int index = 0;
for(int i = 0; i < bookName.length; i++) {
if(name.equals(bookName[i])) {
index = i;
break;
}
}
if(state[index].equals("可借")) {
System.out.println("该书已归还");
}else{
state[index] = "可借";
System.out.println("该书已归还");
}
}else{
System.out.println("该书不存在");
}
break;
case 6:
System.out.println("退出系统");
return;
}
System.out.println("输入0返回");
num = scanner.nextInt();
System.out.println(num);
int bb = 0;
while(num !=0) {
System.out.println("----------输入错误请继续输入-----------");
System.out.println("\t\t\t需要输入0才能返回");
num = scanner.nextInt();
if(bb >= 3){
System.out.print("再输入错误就要打屁屁了");
}
bb++;
}
}while(num == 0 );
}
}
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