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+### 作业
+
+参考学生管理系统，自己写一个书本管理系统
+
+```java
+import java.util.Scanner;
+
+public class zy23 {
+    public static void main(String[] args) {
+        String[] books =new String[10];
+        books[0]="语文";
+        books[1]="数学";
+        books[2]="英语";
+        books[3]="政治";
+        books[4]="历史";
+        books[5]="地理";
+        books[6]="物理";
+        books[7]="化学";
+        books[8]="生物";
+        while (true){
+            book();
+            int num =choice();
+            if (num==6){
+                break;
+            }
+            get(num , books);
+        }
+
+    }
+    public static void book(){
+        System.out.println(
+                "欢迎使用书本管理系统\n"+
+                "1.浏览书本信息\n"+
+                "2.添加书本信息\n"+
+                "3.修改书本信息\n"+
+                "4.删除书本信息\n"+
+                "5.查询书本信息\n"+
+                "6.退出系统\n"
+        );
+    }
+    public static int choice() {
+        System.out.println("请选择您的操作");
+        Scanner sc = new Scanner(System.in);
+        int num= sc.nextInt();
+        return num;
+    }
+    public static void get(int num,String[] books){
+switch (num){
+    case 1:
+        allbooks(books);
+        break;
+    case 2:
+tjbooks(books);
+        break;
+    case 3:
+        xgbooks(books);
+        break;
+    case 4:
+        scbooks(books);
+        break;
+    case 5:
+        cxbooks(books);
+        break;
+    case 6:
+        break;
+}
+    }
+
+    private static void cxbooks(String[] books) {
+        System.out.println("请输入您要查询的书");
+        Scanner sc = new Scanner(System.in);
+        String name = sc.next();
+        int index = cz(books,name);
+        if (index==-1){
+            System.out.println("该书不存在!");
+        }else {
+            books[index]=null;
+            System.out.println("这本书在第"+(index+1)+"个");
+        }
+    }
+
+    private static void scbooks(String[] books) {
+        System.out.println("请输入您要删除的书");
+        Scanner sc = new Scanner(System.in);
+        String name = sc.next();
+        int index = cz(books,name);
+        if (index==-1){
+            System.out.println("该书不存在!");
+        }else {
+        books[index]=null;
+            System.out.println("删除成功");
+        }
+    }
+
+    private static void xgbooks(String[] books) {
+        System.out.println("请输入您要修改的书本");
+        Scanner sc = new Scanner(System.in);
+        String name = sc.next();
+        int index = cz(books,name);
+        if (index==-1){
+            System.out.println("没有这本书!");
+        }else {
+            System.out.println("请输入新的书名");
+            String newName = sc.next();
+books[index]=newName;
+            System.out.println("修改成功");
+        }
+    }
+
+    public static void tjbooks(String[] books) {
+        System.out.println("请输入您要添加的书本");
+        Scanner sc =new Scanner(System.in);
+        String name = sc.next();
+       int a=cz(books,name);
+       if (a==-1){
+           int index=cz(books,null);
+           books[index]=name;
+           System.out.println("添加成功");
+       }else {
+           System.out.println("该书已存在!");
+       }
+    }
+
+    private static void allbooks(String[] books) {
+        for (String name: books) {
+            if (name==null){
+                continue;
+            }
+            System.out.print(name+"\t");
+        }
+        System.out.println();
+        System.out.println();
+    }
+public static int cz(String[] books,String name){
+    int index = -1;
+    if (name==null){
+        for (int i = 0; i < books.length; i++) {
+            if (books[i]==null){
+index=i;
+            }
+        }
+    }else {for (int i = 0; i < books.length; i++) {
+        if (name.equals(books[i])) {
+            index = i;
+            break;
+        }
+    }
+    }
+    return index;
+}
+}
+```
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