From 4d12980dac76c1c19e7dfc62880455155d566584 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 8 Aug 2026 16:38:59 +0800
Subject: [PATCH] =?UTF-8?q?s-day07-=20Stream=E6=B5=81=E4=B8=AD=E7=9A=84?=
 =?UTF-8?q?=E5=B8=B8=E7=94=A8=E6=96=B9=E6=B3=95=5Fmap?=
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---
 .../src/com/inmind/stream07/MapDemo20.java    | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 s-day07/src/com/inmind/stream07/MapDemo20.java

diff --git a/s-day07/src/com/inmind/stream07/MapDemo20.java b/s-day07/src/com/inmind/stream07/MapDemo20.java
new file mode 100644
index 0000000..fccdc03
--- /dev/null
+++ b/s-day07/src/com/inmind/stream07/MapDemo20.java
@@ -0,0 +1,28 @@
+package com.inmind.stream07;
+
+import java.util.stream.Stream;
+
+/*
+Stream中的常用方法_map
+    将一种类型的流的数据，全部映射（转换）成另一种数据类型的流的方法
+    <R> Stream<R> map(Function<? super T,? extends R> mapper)
+
+    知识点回顾：
+        Function<T,R>:数据工厂，用来数据转换
+        T:参数
+        R：返回值
+        抽象方法： R apply(T t)
+        lambda表达式：t->{return }
+    map方法的执行过程：将流中的每个元素，作为参数传入以上Lambda表达式中，将转换的结果全部保存到新的流
+
+    map:可以进行数据的拷贝，或者将保存了对象数据的字符串直接转为自定义对象
+ */
+public class MapDemo20 {
+    public static void main(String[] args) {
+        //{"10","100","12","32","55"}字符串流-->整数流
+        Stream<String> stream = Stream.of("10", "100", "12", "32", "55");
+        //字符串流-->整数流
+        Stream<Integer> newStream = stream.map(s ->Integer.parseInt(s));
+        newStream.forEach(i-> System.out.println(i));
+    }
+}