diff --git a/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java b/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
index 7f5f9ba..3d0484a 100644
--- a/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
@@ -90,7 +90,7 @@ public class CollectionDemo {
         list.remove(0);// 从集合中删除指定位置的元素，并将其返回
         int size = list.size();// 长度
         boolean isEmpty = list.isEmpty();// 是否为空
-        boolean contains = list.contains(Integer.valueOf(1));// 是否包含元素
+        boolean contains = list.contains(1);// 是否包含元素
         // l.clear();//清除集合元素
         Set<Integer> s = new HashSet<>();// 无序
         s.add(111);
@@ -118,7 +118,7 @@ public class CollectionDemo {
         /**
          * lambda表达式
          */
-        list.forEach(o -> System.out.println(o));
+        list.forEach(System.out::println);
         //删除某元素
         list.removeIf(integer -> integer == 0);
 
@@ -150,7 +150,7 @@ public class CollectionDemo {
         /**
          * lambda表达式
          */
-        list.sort((o1, o2) -> o1 - o2);
+        list.sort(Comparator.comparingInt(o -> o));
 
         /*
          * 队列 队列也可以存放一组元素，但是存取元素必须 遵循：先进先出原则
diff --git a/boot-service/src/main/java/com/xwbing/demo/LambdaDemo.java b/boot-service/src/main/java/com/xwbing/demo/LambdaDemo.java
index 4739f80..49fa132 100644
--- a/boot-service/src/main/java/com/xwbing/demo/LambdaDemo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/LambdaDemo.java
@@ -34,7 +34,7 @@ public class LambdaDemo {
 //        //遍历
 //        Arrays.stream(arrays).forEach(System.out::println);
         list.forEach(System.out::println);
-        lists.sort((o1, o2) -> o1 - o2);//升序排序，不需要收集
+        lists.sort(Comparator.comparingInt(o -> o));//升序排序，不需要收集
         System.out.println("sort:" + lists.stream().sorted((o1, o2) -> o2 - o1).collect(Collectors.toList()));//排序
         System.out.println("map:" + lists.stream().map(o1 -> o1 * 2).collect(Collectors.toList()));//转换
         System.out.println("distinct:" + lists.stream().distinct().collect(Collectors.toList()));//去重(去重逻辑依赖元素的equals方法)
diff --git a/boot-service/src/main/java/com/xwbing/demo/demo.java b/boot-service/src/main/java/com/xwbing/demo/demo.java
index 75b43e8..5f50a08 100644
--- a/boot-service/src/main/java/com/xwbing/demo/demo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/demo.java
@@ -1,7 +1,5 @@
 package com.xwbing.demo;
 
-import java.util.ArrayList;
-import java.util.List;
 import java.util.concurrent.ExecutionException;
 
 /**
@@ -12,12 +10,7 @@ import java.util.concurrent.ExecutionException;
  */
 public class demo {
     public static void main(String[] args) throws ExecutionException, InterruptedException {
-        String s="001";
-        Integer integer = Integer.valueOf(s);
-        System.out.println(integer);
-        List<Integer> list = new ArrayList<>();
-        for (int i = 0; i < 20; i++) {
-            list.add(i);
-        }
+        int i = "222".compareTo("11111");
+        System.out.println(i);
     }
 }