[add] add module java8

brianway · brianway · commit 2bd399ce267e · 2016-12-26T23:09:28.000+08:00
diff --git a/java8/pom.xml b/java8/pom.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-learning</artifactId>
+        <groupId>com.brianway.learning.java</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>java8</artifactId>
+
+</project>
diff --git a/java8/src/main/java/com/brianway/learning/java8/lambda/FilteringApples.java b/java8/src/main/java/com/brianway/learning/java8/lambda/FilteringApples.java
@@ -0,0 +1,81 @@
+package com.brianway.learning.java8.lambda;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Predicate;
+
+/**
+ * Created by brian on 16/12/26.
+ */
+public class FilteringApples {
+    public static void main(String[] args) {
+        List<Apple> inventory = Arrays.asList(new Apple(80, "green"),
+                new Apple(155, "green"),
+                new Apple(120, "red"));
+
+        List<Apple> greenApples = filter(inventory, FilteringApples::isGreenApple);
+        System.out.println(greenApples);
+
+        List<Apple> greenApples2 = filter(inventory, (Apple a) -> "green".equals(a.getColor()));
+        System.out.println(greenApples2);
+
+        List<Apple> heavyApples = filter(inventory, FilteringApples::isHeavyApple);
+        System.out.println(heavyApples);
+
+        List<Apple> heavyApples2 = filter(inventory, (Apple a) -> a.getWeight() > 150);
+        System.out.println(heavyApples2);
+
+    }
+
+    public static List<Apple> filter(List<Apple> inventory, Predicate<Apple> p) {
+        List<Apple> result = new ArrayList<>();
+        for (Apple apple : inventory) {
+            if (p.test(apple)) {
+                result.add(apple);
+            }
+        }
+        return result;
+    }
+
+    public static boolean isGreenApple(Apple apple) {
+        return "green".equals(apple.getColor());
+    }
+
+    public static boolean isHeavyApple(Apple apple) {
+        return apple.getWeight() > 150;
+    }
+
+    public static class Apple {
+        private int weight = 0;
+        private String color = "";
+
+        public Apple(int weight, String color) {
+            this.weight = weight;
+            this.color = color;
+        }
+
+        public Integer getWeight() {
+            return weight;
+        }
+
+        public void setWeight(Integer weight) {
+            this.weight = weight;
+        }
+
+        public String getColor() {
+            return color;
+        }
+
+        public void setColor(String color) {
+            this.color = color;
+        }
+
+        public String toString() {
+            return "Apple{" +
+                    "color='" + color + '\'' +
+                    ", weight=" + weight +
+                    '}';
+        }
+    }
+}
diff --git a/pom.xml b/pom.xml
@@ -13,6 +13,8 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <junit.version>4.11</junit.version>
     </properties>
 
@@ -48,6 +50,7 @@
         <module>java-base</module>
         <module>java-container</module>
         <module>java-io</module>
+        <module>java8</module>
     </modules>
 
     <dependencyManagement>
