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 55b7606..7f5f9ba 100644
--- a/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
@@ -8,6 +8,7 @@ import java.util.*;
 /**
  * 创建日期: 2017年2月16日 下午4:06:56
  * 作者: xiangwb
+ * 说明: ArrayList初始容量为10,容量不足,会扩充为原有容量的1.5倍+1。然后通过底层的复制方法将原有数据复制过来
  */
 
 public class CollectionDemo {
diff --git a/boot-service/src/main/java/com/xwbing/demo/ForEachMap.java b/boot-service/src/main/java/com/xwbing/demo/ForEachMap.java
index ed7f073..0227bf3 100644
--- a/boot-service/src/main/java/com/xwbing/demo/ForEachMap.java
+++ b/boot-service/src/main/java/com/xwbing/demo/ForEachMap.java
@@ -13,35 +13,35 @@ import java.util.Set;
  * 遍历所有的key
  * 遍历所有的key-value对
  * 遍历所有的value（相对不常用）
- * 
- * @author xiangwb
+ * --------------------------------------------------------------------------------------------------------------------------------
+ * 说明: HashMap初始容量capacity为16,加载因子loadFactor为0.75,临界值threshold=capacity*loadFactor,如果元素个数超过临界值,capacity*2
  *
+ * @author xiangwb
  */
 public class ForEachMap {
-	public static void main(String[] args) {
-		Map<String,Integer> map=new HashMap<String,Integer>();
-		map.put("语文", 99);
-		map.put("数学", 98);
-		map.put("英语", 97);
-		map.put("物理", 96);
-		map.put("化学", 99);
-		System.out.println(map);
-		
-		
-		
-		/*
-		 * 遍历所有的key
+    public static void main(String[] args) {
+        Map<String, Integer> map = new HashMap<String, Integer>() {
+            {
+                put("语文", 99);
+                put("数学", 98);
+                put("英语", 97);
+                put("物理", 96);
+                put("化学", 99);
+            }
+        };
+        /*
+         * 遍历所有的key
 		 * set<k>   keySet()
 		 * 该方法会将当前map中所有的key存入一个set集合后返回
 		 * 那么遍历该集合就等于遍历类所有的key
 		 */
-		Set<String> keySet=map.keySet();
-		for(String key:keySet){
-			System.out.println(key);
-		}
-		
+        Set<String> keySet = map.keySet();
+        for (String key : keySet) {
+            System.out.println(key);
+        }
+
 		/*
-		 * 遍历每一组键值对（推荐）
+         * 遍历每一组键值对（推荐）
 		 * map中每一组键值对都是由map的内部类：
 		 * java.util.map.entry的一个实例类表示的
 		 * entry有两个方法：getkey  getvalue 可以分别获取这一组键值对中的key和value
@@ -50,29 +50,27 @@ public class ForEachMap {
 		 * 该方法会将map中的每一组键对（entry实例）
 		 * 存入一个set集合后返回
 		 */
-		Set<Entry<String,Integer>>   entrySet=map.entrySet();
-		for(Entry<String,Integer> e:entrySet){
-			String key=e.getKey();
-			Integer value=e.getValue();
-			System.out.println(key+":"+value);
-		}
-		
+        Set<Entry<String, Integer>> entrySet = map.entrySet();
+        for (Entry<String, Integer> e : entrySet) {
+            String key = e.getKey();
+            Integer value = e.getValue();
+            System.out.println(key + ":" + value);
+        }
+
 		/*
-		 * 遍历所有的value
+         * 遍历所有的value
 		 * Collection values()
 		 * 该方法会将当前map中所有的value存入一个集合后返回
 		 */
-		Collection<Integer> values=map.values();
-		for(Integer value:values){
-			System.out.println(value);
-		}
-		
-		
-		/**
-		 * jdk1.8
-		 */
-		map.forEach((k,v)->{
-			System.out.println("key : " + k + "; value : " + v);
-		});
-	}
+        Collection<Integer> values = map.values();
+        for (Integer value : values) {
+            System.out.println(value);
+        }
+
+
+        /*
+         * jdk1.8
+         */
+        map.forEach((k, v) -> System.out.println("key : " + k + "; value : " + v));
+    }
 }
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 36ea27c..9bb6d5d 100644
--- a/boot-service/src/main/java/com/xwbing/demo/demo.java
+++ b/boot-service/src/main/java/com/xwbing/demo/demo.java
@@ -2,7 +2,6 @@ package com.xwbing.demo;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 
 /**
@@ -13,20 +12,14 @@ 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 < 100; i++) {
+        for (int i = 0; i < 20; i++) {
             list.add(i);
         }
-        int size = list.size();
-        CompletableFuture[] futures = new CompletableFuture[size];
-        List<Integer> finalList = new ArrayList<>();
-        for (int i = 0; i < size; i++) {
-            finalList.add(null);
-            Integer integer = list.get(i);
-            int finalI = i;
-            futures[i] = CompletableFuture.supplyAsync(() -> finalList.set(finalI, integer));
-        }
-        CompletableFuture.allOf(futures).join();
-        System.out.println(finalList);
+
+
     }
 }