diff --git a/javaSE-day07/src/com/inmind/stream03/ConcatDemo23.java b/javaSE-day07/src/com/inmind/stream03/ConcatDemo23.java
new file mode 100644
index 0000000..901e359
--- /dev/null
+++ b/javaSE-day07/src/com/inmind/stream03/ConcatDemo23.java
@@ -0,0 +1,17 @@
+package com.inmind.stream03;
+
+import java.util.stream.Stream;
+
+/*
+19.Stream流中的常用方法_concat
+static <T> Stream<T> concat(Stream a, Stream b) 合并2个流生成一个新的流
+ */
+public class ConcatDemo23 {
+    public static void main(String[] args) {
+        Stream<Integer> stream1 = Stream.of(1, 2, 3);
+        Stream<Integer> stream2 = Stream.of(4, 5, 6);
+
+        Stream<Integer> stream = Stream.concat(stream1, stream2);
+        stream.forEach(i-> System.out.println(i));
+    }
+}