基础版本

Author: liangxuekai

.idea/java8-.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/modules.xml

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+import java.util.List;
+import java.util.stream.Stream;
+
+import static java.util.stream.Collectors.toList;
+
+public class java8Lambda {
+    /*List<String> list = new ArrayList<>();
+     list.add("a");
+     list.add("b");
+     list.add("c");*/
+    //可修改为
+    List<String> list = Stream.of("a", "b", "c", "1qwe", "123")
+            .collect(toList());
+    //将集合中的字符改成大写
+      /*  list.stream()
+                .map(string -> string.toUpperCase())
+                .collect(Collectors.toList()).forEach(a -> {
+            System.out.println(a);
+        });*/
+    //获取到集合中的字符串中含有数字的字符串
+        /*list.stream().filter(value -> Character.isDigit(value.charAt(0)))
+                .forEach(value -> {
+                    System.out.println(value);
+                });*/
+
+    //一个包含多个列表的流，需要获取到所有数字的序列
+       /* List<? extends Serializable> collect = Stream.of(asList('a', 'a'), asList(3, 4))
+                .flatMap(number -> number.stream())
+                .collect(toList());*/
+    //求最大值和最小值
+    //查找Track对象中Length最小的对象
+        /*List<Track> tracks = asList(new Track("test1", 100),
+                new Track("test2", 200),
+                new Track("test3", 300));
+        Track track1 = tracks.stream()
+                .min(Comparator.comparing(track -> track.getLength()))
+                .get();
+
+        System.out.println(track1.getLength());*/
+
+    //reduce 实现累加
+       /* Integer reduce = Stream.of(1, 2, 3).
+                reduce(555, (acc, element) -> acc + element);
+
+        System.out.println(reduce);*/
+}