diff --git a/javaSE-day07/src/com/inmind/stream03/CountDemo20.java b/javaSE-day07/src/com/inmind/stream03/CountDemo20.java
new file mode 100644
index 0000000..8f252db
--- /dev/null
+++ b/javaSE-day07/src/com/inmind/stream03/CountDemo20.java
@@ -0,0 +1,14 @@
+package com.inmind.stream03;
+
+import java.util.stream.Stream;
+
+/*
+Stream流中的常用方法_count
+获取流中元素的个数
+ */
+public class CountDemo20 {
+    public static void main(String[] args) {
+        Stream<Integer> stream = Stream.of(1, 2, 4);
+        System.out.println(stream.count());//3
+    }
+}