update code

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());
+
+    }
+}