From 2b13c1eae4a15b163225900fd71eec5e28a4109f Mon Sep 17 00:00:00 2001
From: sawyergore <3077528351@qq.com>
Date: Fri, 22 Jul 2022 22:33:01 +0800
Subject: [PATCH] =?UTF-8?q?#002=E7=BA=BF=E6=80=A7=E6=9F=A5=E6=89=BE?=
 =?UTF-8?q?=E5=92=8C=E4=BA=8C=E5=88=86=E6=9F=A5=E6=89=BE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/main/java/sort/TestBinarySearch.java  | 49 +++++++++++++++++++
 .../src/main/java/sort/TestSearch.java        | 28 +++++++++++
 .../com/example/h2db/H2dbApplication.java     |  1 -
 .../java/com/example/h2db/entity/User.java    |  4 --
 4 files changed, 77 insertions(+), 5 deletions(-)
 create mode 100644 data_structure/src/main/java/sort/TestBinarySearch.java
 create mode 100644 data_structure/src/main/java/sort/TestSearch.java

diff --git a/data_structure/src/main/java/sort/TestBinarySearch.java b/data_structure/src/main/java/sort/TestBinarySearch.java
new file mode 100644
index 0000000..76fdac7
--- /dev/null
+++ b/data_structure/src/main/java/sort/TestBinarySearch.java
@@ -0,0 +1,49 @@
+package sort;
+
+/**
+ * 二分查找,对于目标数组必须有序
+ * @author Sawyer
+ * @date 2022/7/22
+ */
+public class TestBinarySearch {
+    public static void main(String[] args) {
+        //目标数组
+        int [] arr = new int []{1,2,3,4,5,6,7,8,9};
+        //目标元素
+        int target = 8;
+        //目标元素下标
+        int index = -1;
+        //记录开始位置
+        int begin = 0;
+        //记录结束位置
+        int end = arr.length-1;
+        //记录中间位置
+        int mid = (begin+end)/2;
+        int i =0;
+        //循环查找
+        while (i<arr.length){
+            //判断中间的元素是不是要查找的元素
+            if(arr[mid]==target){
+                index = mid;
+                break;
+                //不是要查找的元素
+            }else {
+                //判断中间元素是否比目标元素大
+                if(arr[mid]>target){
+                    //把结束位置调整到中间位置前一个位置
+                    end = mid-1;
+                    //中间这个元素比目标元素小
+                }else {
+                    //把开始位置调整到中间位置的后一个位置
+                    begin = mid+1;
+                }
+                //取出新的中间位置
+                mid=(begin+end)/2;
+                i++;
+
+            }
+        }
+        System.out.println("index:"+index);
+
+    }
+}
diff --git a/data_structure/src/main/java/sort/TestSearch.java b/data_structure/src/main/java/sort/TestSearch.java
new file mode 100644
index 0000000..36dd441
--- /dev/null
+++ b/data_structure/src/main/java/sort/TestSearch.java
@@ -0,0 +1,28 @@
+package sort;
+
+/**
+ * 线性查找
+ * @author Sawyer
+ * @date 2022/7/22
+ */
+public class TestSearch {
+    public static void main(String[] args) {
+        /*
+          目标数组
+         */
+        int[] arr = new int[]{1,2,3,4,5,6,7};
+        //目标元素
+        int target=3;
+        //目标元素所在下标
+        int index=-1;
+        for (int j : arr) {
+            if (j == target) {
+                index = target;
+                break;
+            }
+        }
+        //打印目标元素下标
+        System.out.println("index"+index);
+    }
+
+}
diff --git a/h2db/src/main/java/com/example/h2db/H2dbApplication.java b/h2db/src/main/java/com/example/h2db/H2dbApplication.java
index 1cea5e2..0de1fec 100644
--- a/h2db/src/main/java/com/example/h2db/H2dbApplication.java
+++ b/h2db/src/main/java/com/example/h2db/H2dbApplication.java
@@ -1,7 +1,6 @@
 package com.example.h2db;
 
 import org.mybatis.spring.annotation.MapperScan;
-import org.mybatis.spring.annotation.MapperScans;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
diff --git a/h2db/src/main/java/com/example/h2db/entity/User.java b/h2db/src/main/java/com/example/h2db/entity/User.java
index 0e47f48..1082c07 100644
--- a/h2db/src/main/java/com/example/h2db/entity/User.java
+++ b/h2db/src/main/java/com/example/h2db/entity/User.java
@@ -1,9 +1,5 @@
 package com.example.h2db.entity;
 
-import com.baomidou.mybatisplus.annotation.IdType;
-import com.baomidou.mybatisplus.annotation.TableField;
-import com.baomidou.mybatisplus.annotation.TableId;
-import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.Data;
 
 /**