add files

src/main/java/com/example/demo/bo/UserBo.java

+package com.example.demo.bo;
+
+import lombok.Data;
+
+
+@Data
+public class UserBo {
+    private int id;
+    private String name;
+}

src/main/java/com/example/demo/controller/BaseController.java

@@ -6,10 +6,6 @@ import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
 
-/**
- * @author lixiaoyu
- * @since 2:16 下午
- */
 @RestController
 @RequestMapping("/")
 public class BaseController {

src/main/java/com/example/demo/controller/StringController.java

+package com.example.demo.controller;
+
+import com.example.demo.bo.UserBo;
+import com.example.demo.tool.Gengric;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.*;
+
+
+@RestController
+@RequestMapping("/")
+public class StringController {
+
+    @GetMapping("/string")
+    public void stringDemo(){
+        //字符
+        char charDemo1 = 'x';
+        Character charDemo2 = new Character('x');
+
+        //字符串
+        String stringDemo1 = "test";
+        String stringDemo2 = new String("test");
+
+        stringDemo2.length(); //获取长度
+        stringDemo2.concat(" user"); //拼接字符串
+        stringDemo2.toLowerCase(); //转小写
+        stringDemo2.compareTo(stringDemo1); //对比
+        stringDemo2.substring(1,3); //截取
+
+        //字符串缓冲区
+        StringBuffer stringDemo3 = new StringBuffer("test");
+        stringDemo3.append(" user"); //追加
+        stringDemo3.insert(2,"u"); //插入
+        stringDemo3.delete(2,3); //删除
+        stringDemo3.length(); //获取长度
+        stringDemo3.substring(0,2); //截取
+
+    }
+
+    @GetMapping("/array")
+    public void arrayDemo(){
+        //数组,必须指定大小
+        String[] arrDemo1 = new String[3];
+        arrDemo1[0] = "str1";
+        arrDemo1[1] = "str1"; //值可以重复
+        arrDemo1[2] = "str1";
+
+        String[] arrDemo2 = arrDemo1.clone(); //复制 克隆
+        Arrays.fill(arrDemo2,"test2"); //Array类的使用
+
+        UserBo[] arrDemo3 = new UserBo[5]; //对象数组，不是只能用基本类型
+    }
+
+    @GetMapping("/arraylist")
+    public void arraylistDemo(){
+        //泛型可以接收任何参数
+        Gengric<String> aDemo1 =new Gengric<>();
+        aDemo1.setDemo1("string");
+        //不只是基本数据类型
+        Gengric<UserBo> aDemo2 =new Gengric<>();
+        UserBo userBo = new UserBo();
+        aDemo2.setDemo1(userBo);
+
+        //单向链表
+        LinkedList<String> aDemo3 = new LinkedList<>();
+        aDemo3.add("str1"); //插入
+        aDemo3.get(0); //获取
+        aDemo3.addFirst("str2"); //头部添加
+        aDemo3.addLast("str3"); //尾部添加
+        aDemo3.size(); //长度
+
+        //动态数组
+        ArrayList aDemo4 = new ArrayList<>();
+        aDemo4.add(userBo);
+        aDemo4.add("str5");
+        aDemo4.add(100); //可以加入不同数据类型
+
+        //HashSet
+        HashSet<Integer> aDemo5 = new HashSet<>();
+        aDemo5.add(1);
+        aDemo5.add(2);
+
+        //TreeSet
+        TreeSet<Integer> aDemo6 = new TreeSet<>();
+        aDemo6.add(20);
+        aDemo6.add(10);
+        aDemo6.add(50);
+
+        //HashMap
+        HashMap<Integer,String> aDemo7 = new HashMap<>();
+        aDemo7.put(5,"str8");
+        aDemo7.put(1,"str9");
+        aDemo7.put(3,"str10");
+
+
+        //TreeMap
+        TreeMap<Integer,String> aDemo8 = new TreeMap<>();
+        aDemo8.put(5,"str8");
+        aDemo8.put(1,"str9");
+        aDemo8.put(3,"str10");
+
+
+
+    }
+
+
+}

src/main/java/com/example/demo/tool/Gengric.java

+package com.example.demo.tool;
+
+/**
+ * 泛型的类
+ * @param <T>
+ */
+public class Gengric<T> {
+    private T demo1;
+    public void setDemo1(T demo1){
+        this.demo1 = demo1;
+    }
+
+    public T getDemo1(){
+        return this.demo1;
+    }
+}

target/classes/application.yml

+server:
+  port: 8099