From f3402dc2d76e2510a3b2443f87bdb3852c807dbe Mon Sep 17 00:00:00 2001
From: Bunny <1319900154@qq.com>
Date: Tue, 13 Aug 2024 23:36:51 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0map=E3=80=81set=E3=80=81list?=
 =?UTF-8?q?=E6=93=8D=E4=BD=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .gitignore                                    |  32 ++++++++++++++
 jTest/StreamTest.java                         |  39 ++++++++++++++++++
 .../Kotlin-Demo/jTest/PropertiesTest.class    | Bin 710 -> 0 bytes
 .../Kotlin-Demo/jTest/StreamTest.class        | Bin 0 -> 3633 bytes
 4 files changed, 71 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 jTest/StreamTest.java
 delete mode 100644 out/production/Kotlin-Demo/jTest/PropertiesTest.class
 create mode 100644 out/production/Kotlin-Demo/jTest/StreamTest.class

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ff93b79
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,32 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+logs/
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+
+### VS Code ###
+.vscode/
diff --git a/jTest/StreamTest.java b/jTest/StreamTest.java
new file mode 100644
index 0000000..16ab5cb
--- /dev/null
+++ b/jTest/StreamTest.java
@@ -0,0 +1,39 @@
+package jTest;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.IntStream;
+
+public class StreamTest {
+    public static void main(String[] args) {
+        // 创建二维数组
+        List<List<String>> list1 = Arrays.asList(
+                Arrays.asList("a", "b", "c"),
+                Arrays.asList("a", "b", "c")
+        );
+        // 二维数组平整化
+        List<String> list = list1.stream().flatMap(List::stream).toList();
+        System.out.println(list);// [a, b, c, a, b, c]
+
+        // peek可以用来调试也可以塞对象，不改变流，如果你这个里面有对象，比如xxx.setXXX() 那么也会修改这个对象
+        List<String> list2 = list.stream().filter(s -> s.startsWith("a"))
+                .peek(System.out::println)
+                .map(String::toUpperCase).toList();
+        System.out.println(list2);// [A, A]
+
+        // 求和
+        int sum = IntStream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10).sum();
+        System.out.println(sum);
+
+        // Map集合
+        Map<String, Integer> counts = new HashMap<>();
+        counts.put("apple", 1);
+        counts.put("banana", 1);
+        System.out.println(counts);
+
+        counts.compute("apple", (key, val) -> val == null ? 1 : val + 1);
+        System.out.println(counts);
+    }
+}
diff --git a/out/production/Kotlin-Demo/jTest/PropertiesTest.class b/out/production/Kotlin-Demo/jTest/PropertiesTest.class
deleted file mode 100644
index 36f30a72b5745c115c4b0a7111c4d35a742e489c..0000000000000000000000000000000000000000
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diff --git a/out/production/Kotlin-Demo/jTest/StreamTest.class b/out/production/Kotlin-Demo/jTest/StreamTest.class
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