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‎JdkLearn/src/main/java/com/learnjava/lambda/LambdaDemo01.java‎
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‎JdkLearn/src/main/java/com/learnjava/lambda/LambdaDemo01.java‎
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+37Lines changed: 37 additions & 0 deletions
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‎JdkLearn/src/main/java/com/learnjava/lambda/LambdaDemoForList.java‎
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‎JdkLearn/src/main/java/com/learnjava/lambda/LambdaDemoForList.java‎
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+40Lines changed: 40 additions & 0 deletions
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+package com.learnjava.lambda;
+
+/**
+ * @author bruis
+ * lambda表达式
+ */
+public class LambdaDemo01 {
+
+    /**
+     * 打印内部类
+     */
+    interface Printer {
+        void print(String content);
+//        void print(String content, String operator);
+    }
+
+    public static void printSomething(String content, Printer printer) {
+        printer.print(content);
+    }
+
+    public static void main(String[] args) {
+//        Printer printer = (String content) -> {
+//            System.out.println(content);
+//        };
+
+//        去掉参数类型，只有一个参数时可以去掉括号
+//        Printer printer = (content) -> {
+//            System.out.println(content);
+//        };
+
+//        只有一个参数提
+//        Printer printer = val -> System.out.println(val);
+
+        Printer printer = System.out::println;
+        printSomething("hello lambda", printer);
+    }
+}
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+package com.learnjava.lambda;
+
+import jdk.nashorn.internal.objects.annotations.Constructor;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * @author bruis
+ * Lambda的List demo
+ */
+public class LambdaDemoForList {
+
+    public static void main(String[] args) {
+        test01();
+    }
+
+    public static void test01() {
+        List<String> nameStrList = Arrays.asList("abc", "efg", "hig", "hii", "klm");
+
+        List<String> result = nameStrList
+                .stream()
+                .filter(s -> s.startsWith("h"))
+                .map(String::toUpperCase)
+                .map(MyStringUtils::myToUpperCase)
+                .collect(Collectors.toList());
+
+        for (String name : result) {
+            System.out.println(name);
+        }
+    }
+
+    private static class MyStringUtils {
+
+        public static String myToUpperCase(String str) {
+            return str.toUpperCase();
+        }
+    }
+}