库

// test.java
package com.southwind.test;
import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		String[] bookName = {"三国演义","西游记","水浒传","红楼梦","七龙珠","海贼王"};
		Scanner scanner = new Scanner(System.in);
		String name = scanner.next();
		System.out.println(Arrays.binarySearch(bookName, name));
	}
}

// Book.java
package com.southwind.test;
import java.util.Arrays;
import java.util.Scanner;

public class Book {
	public static void main(String[] args) {
		//初始化数据
		String[] bookName = {"三国演义","西游记","水浒传","红楼梦","七龙珠","海贼王"};
		String[] state = {"可借","可借","可借","可借","可借","可借"};
		int[] count = {0,0,0,0,0,0};
		Scanner scanner = new Scanner(System.in);
		int num = 0;
		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.退出系统");
			System.out.println("-----------------------------");
			System.out.print("请选择：");
			num = scanner.nextInt();
			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");
				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]);
				}
				break;
			case 2:
				System.out.println("---》新增图书");
				//判断数组中是否有位置来存放新书
				if(bookName[bookName.length-1] == null) {
					System.out.print("请输入书名：");
					String name = scanner.next();
					//检测数组中是否已经存在
					//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+">>已存在，请勿重复添加");
					}else {
						for(int i = 0; i < bookName.length; i++) {
							if(bookName[i] == null) {
								bookName[i] = name;
								break;
							}
						}
						System.out.println("<<"+name+">>添加成功！");
					}
				}else {
					System.out.println("书架已满！！！");
				}
				break;
			case 3:
				System.out.println("--》删除图书");
				//1.检测bookName是否为空
				boolean 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于书架中
					System.out.print("请输入要删除的书名：");
					String name = scanner.next();
					boolean flag2 = false;
					for(String name2:bookName) {
						if(name.equals(name2)) {
							flag2 = true;
							break;
						}
					}
					if(flag2) {
						//找到被删除的书在数组中的下标
						int index = 0;
						for(int i = 0; i < bookName.length; i++) {
							if(name.equals(bookName[i])) {
								index = i;
								break;
							}
						}
						//index之后的数据向前提
						for(int i = index;i < bookName.length-1;i++) {
							bookName[i] = bookName[i+1];
						}
						//将数组的最后一位置为null
						bookName[bookName.length-1] = null;
						System.out.println("<<"+name+">>成功删除！");
					}else {
						System.out.println("您输入的书名不存在，请确认！");
					}
				}else {
					System.out.println("书架已空，没有可以删除的书籍！");
				}
				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于书架中
					System.out.print("请输入要借阅的书名：");
					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出
						//将图书对应的数量进行+1
						int index = 0;
						for(int i = 0; i < bookName.length; i++) {
							if(name.equals(bookName[i])) {
								index = i;
								break;
							}
						}
						if(state[index].equals("已借出")) {
							System.out.println("<<"+name+">>已借出，请选择其他书籍！");
						}else {
							state[index] = "已借出";
							count[index] = ++count[index];
							System.out.println("<<"+name+">>借阅成功！");
						}
					}else {
						System.out.println("您输入的书名不存在，请确认！");
					}
				}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");
				System.out.print("请输入要归还的书名：");
				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("<<"+name+">>已经归还！");
					}else {
						state[index] = "可借";
						System.out.println("<<"+name+">>归还成功！");
					}
				}else {
					System.out.println("您输入的书名不存在，请确认！");
				}
				break;
			case 6:
				System.out.println("退出系统");
				return;
			}
			System.out.print("输入0返回：");
			num = scanner.nextInt();
			while(num != 0) {
				System.out.print("输入0返回：");
				num = scanner.nextInt();
			}
		}while(num == 0);
	}
}

// Arrays.java
package com.southwind.test;

public class Arrays {
	public static int binarySearch(String[] array,String name) {
		int index = -1;
		for(int i = 0; i < array.length; i++) {
			if(name.equals(array[i])) {
				index = i;
				break;
			}
		}
		return index;
	}
}