diff --git "a/18 \345\276\220\346\260\270\346\267\263/20221225 java\347\263\273\347\273\237.md" "b/18 \345\276\220\346\260\270\346\267\263/20221225 java\347\263\273\347\273\237.md"
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index 0000000000000000000000000000000000000000..a337b2b11879b5f1a5cd2212e3db2a23d9abca73
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+++ "b/18 \345\276\220\346\260\270\346\267\263/20221225 java\347\263\273\347\273\237.md"	
@@ -0,0 +1,154 @@
+```java
+写一个书籍管理系统
+import java.util.Scanner;
+
+public class iuoo {
+    public class we {
+        public static void main(String[] args) {
+            String[] n=new String[10];
+            while (true){
+                zxc();
+                int num=js();
+                df(num,n);
+                if (num==6){
+                    break;
+                }
+            }
+        }
+        private static void zxc() {
+            System.out.println("" +
+                    "\n==============================\n" +
+                    "-     使用图书管理系统   -\n" +
+                    "- \t\t1.浏览所有书本信息\t\t-\n" +
+                    "- \t\t2.添加书本信息\t\t-\n" +
+                    "- \t\t3.修改书本信息\t\t-\n" +
+                    "- \t\t4.删除书本信息\t\t-\n" +
+                    "- \t\t5.查询书本信息\t\t-\n" +
+                    "- \t\t6.退出管理系统\t\t-\n" +
+                    "==============================");
+        }
+
+        private static void df(int num,String[] n) {
+            switch (num){
+                case 1:
+                    xs(n);
+                    break;
+                case 2:
+                    tj(n);
+                    break;
+                case 3:
+                    xg(n);
+                    break;
+                case 4:
+                    int a=ty(n);
+                    if (a!=-1){
+                        sc(a,n);
+                    }
+                    break;
+                case 5:
+                    int b=ty(n);
+                    if (b!=-1){
+                        cx(b,n);
+                    }
+                    break;
+                case 6:
+                    break;
+            }
+        }
+
+        private static void cx(int b, String[] n) {
+            System.out.println("书籍在第"+(b+1)+"个地方");
+        }
+
+        private static void sc(int a, String[] n) {
+            n[a]=null;
+            System.out.println("删除成功");
+        }
+
+        private static int ty(String[] n) {
+            System.out.println("输入书本名称");
+            Scanner n1=new Scanner(System.in);
+            String mc= n1.next();
+            int cf=-1;
+            int aa=0;
+            for (int i=0;i<n.length;i++){
+                if (mc.equals(n[i])){
+                    cf=i;
+                    break;
+                }else {
+                    aa++;
+                    if (n.length==aa){
+                        System.out.println("未查询到该书本");
+                        break;
+                    }
+                }
+            }
+            return cf;
+        }
+
+        private static void xg(String[] n) {
+            System.out.println("输入需要修改的书本");
+            Scanner n1=new Scanner(System.in);
+            String mc= n1.next();
+            int aa=0;
+            for (int i=0;i<n.length;i++){
+                if (mc.equals(n[i])){
+                    System.out.println("输入修改后的名称");
+                    Scanner a=new Scanner(System.in);
+                    n[i]= a.next();
+                    System.out.println("修改成功！");
+                    break;
+                }else{
+                    aa++;
+                    if (n.length==aa){
+                        System.out.println("未找到该书本");
+                        break;
+                    }
+                }
+            }
+        }
+
+        private static void tj(String[] n) {
+            System.out.println("输入添加的书本名称");
+            Scanner n1=new Scanner(System.in);
+            String mc= n1.next();
+            for (int j=0;j<n.length;j++){
+                if (mc.equals(n[j])){
+                    System.out.println("已存在该"+mc+"书本");
+                    break;
+                }else{
+                    if (null==n[j]){
+                        n[j]=mc;
+                        System.out.println("添加成功！");
+                        break;
+                    }
+                }
+            }
+        }
+
+        private static void xs(String[] n) {
+            int a=0;
+            for (int i=0;i<n.length;i++){
+                if (null==n[i]){
+                    a++;
+                    if (n.length==a){
+                        System.out.println("未添加任何书籍");
+                    }
+                    continue;
+                }else {
+                    System.out.print(n[i]+" ");
+                }
+            }
+        }
+
+        private static int js() {
+            System.out.println("请选择您的操作：");
+            Scanner sc = new Scanner(System.in);
+            int num = sc.nextInt();
+            return num;
+        }
+
+
+    }
+}
+```
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