From f8d20a81e21d4099d07d3850c1df294fd09c37b6 Mon Sep 17 00:00:00 2001
From: 9Discount <benben683280@126.com>
Date: Mon, 16 Jul 2018 20:54:06 +0800
Subject: [PATCH] =?UTF-8?q?List=20Stream=20=E7=BB=83=E4=B9=A0?=
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---
 .../chap4/ZBStreamPractice.java               | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 src/main/java/lambdasinaction/chap4/ZBStreamPractice.java

diff --git a/src/main/java/lambdasinaction/chap4/ZBStreamPractice.java b/src/main/java/lambdasinaction/chap4/ZBStreamPractice.java
new file mode 100644
index 00000000..1fab2289
--- /dev/null
+++ b/src/main/java/lambdasinaction/chap4/ZBStreamPractice.java
@@ -0,0 +1,55 @@
+package lambdasinaction.chap4;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.Optional;
+import java.util.Random;
+import java.util.function.BinaryOperator;
+
+import static java.util.stream.Collectors.toList;
+
+public class ZBStreamPractice {
+
+	public static void main(String... args) {
+
+		System.out.println("下面是 过滤：filter 结果");
+
+		List<Dish> list = Dish.menu.stream().filter(d -> d.getCalories() < 600).collect(toList());
+		list.forEach(System.out::println);
+
+		System.out.println("-------------------------");
+
+		System.out.println("下面是 提取：map 结果");
+
+		List<String> list1 = Dish.menu.stream().map(Dish::getName).collect(toList());
+		list1.forEach(System.out::println);
+
+		System.out.println("-------------------------");
+
+		System.out.println("下面是 截断：limit 结果");
+
+		List<Dish> list2 = Dish.menu.stream().limit(4).collect(toList());
+		list2.forEach(System.out::println);
+
+		System.out.println("-------------------------");
+
+		System.out.println("下面是 排序：sort 结果 采用sort直接排序输出");
+
+		Dish.menu.sort(Comparator.comparing(Dish::getName));
+
+		Dish.menu.forEach(System.out::println);
+
+		System.out.println("下面是 排序：sort 结果 采用sorted，重新生成一个list");
+
+		List<Dish> list3 = Dish.menu.stream().sorted(Comparator.comparing(Dish::getName)).collect(toList());
+		list3.forEach(System.out::println);
+
+		System.out.println("-------------------------");
+
+		System.out.println("下面是 合并：reduce 结果 将所有卡路里加总");
+
+		Optional<Integer> list4 = Dish.menu.stream().map(Dish::getCalories).reduce(Integer::sum);
+		System.out.println(list4);
+
+	}
+}