update code

pom.xml

@@ -17,6 +17,7 @@
         <mybatis.spring.version>1.1.1</mybatis.spring.version>
         <mybatis.generator.core.version>1.3.2</mybatis.generator.core.version>
         <file_encoding>utf-8</file_encoding>
+        <jdk.verion>1.8</jdk.verion>
     </properties>
 
     <dependencies>
@@ -258,8 +259,8 @@
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
                     <configuration>
-                        <source>1.7</source>
-                        <target>1.7</target>
+                        <source>${jdk.verion}</source>
+                        <target>${jdk.verion}</target>
                         <encoding>${file_encoding}</encoding>
                     </configuration>
                 </plugin>

src/main/java/osc/git/eh3/LambdaTest.java

@@ -0,0 +1,50 @@
+package osc.git.eh3;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Created by lixiangrong on 2017/6/20.
+ */
+public class LambdaTest {
+    public static void main(String[] args) {
+        // @FunctionalInterface 函数式接口
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                System.out.println("hello thread");
+            }
+        }).start();
+        new Thread(() -> System.out.println("hello lambda")).start();
+
+        List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7);
+
+        System.out.println("------------打印集合元素----old way----");
+        for (Integer n : list) {
+            System.out.println(n);
+        }
+        System.out.println("------------打印集合元素----new way----");
+        // list.forEach(n -> System.out.println(n));// list.forEach((Integer n) -> {System.out.println(n)});
+        list.forEach(System.out::println);
+
+        System.out.println("------------求平方----old way------");
+        for (Integer n : list) {
+            int x = n * n;
+            System.out.println(x);
+        }
+        System.out.println("------------求平方-----new way-----");
+        // list.stream().map(n -> n * n).forEach(x -> System.out.println(x));
+        list.stream().map(n -> n * n).forEach(System.out::println);
+
+        System.out.println("------------求平方和----old way------");
+        int sum = 0;
+        for (Integer n : list) {
+            int x = n * n;
+            sum = sum + x;
+        }
+        System.out.println(sum);
+        System.out.println("------------求平方和-----new way-----");
+        System.out.println(list.stream().map(n -> n * n).reduce((x, y) -> x + y).get());
+
+    }
+}