JDK1.8之stream lambda表达式

直接看代码

package com.jd.dock.web.controller.monitor;import com.google.common.collect.Maps;import com.google.common.collect.Sets;import java.util.LinkedHashSet;import java.util.Map;import java.util.Objects;import java.util.Set;import java.util.concurrent.TimeUnit;public class TestInfo {    /**     * 测试使用串行流,并行流，以及使用普通遍历的时间消耗     */    public void parallelStream(){        long t0 = System.nanoTime();        Map<String,String> tests= Maps.newHashMap();        for(int i=0;i<100;i++){            tests.put("key:"+i,"value:"+i);        }        tests.keySet().forEach(key ->                System.out.PRintln("key:"+key+"=value+"+tests.get(key)));        /*tests.keySet().parallelStream().forEach(key ->                System.out.println("key:"+key+"=value+"+tests.get(key)));*/      /*  tests.keySet().stream().forEach(key ->                System.out.println("key:"+key+"=value+"+tests.get(key)));*/        long t1 = System.nanoTime();        long millis  = TimeUnit.NANOSECONDS.toMillis(t1 - t0);        System.out.println(String.format("it use time: %d ms", millis));    }    public void testCollage(){        Set<String> skuIdSet =Sets.newHashSet("111","222","333","444");        LinkedHashSet<String>  linktest = skuIdSet.stream().collect(LinkedHashSet::new,(ret,skuId)->ret.add(skuId+"test"),LinkedHashSet::addAll);        System.out.println(linktest);        linktest.removeIf(skuId -> skuId.equals("111test"));        System.out.println(linktest);        Map<String,String> testValue=Maps.newHashMap();        testValue.put("aa","aaa");        testValue.put("bb",null);        System.out.println(testValue);        testValue.values().removeIf(Objects::isNull);        System.out.println(testValue);    }    public static void main(String args[]){        TestInfo t =new TestInfo();        t.testCollage();    }}
下面几篇博客讲得都不错
http://blog.csdn.net/u012702547/article/details/45420435http://blog.csdn.net/kimylrong/article/details/47154879http://www.cnblogs.com/WJ5888/p/4667086.htmlhttp://www.cnblogs.com/WJ5888/p/4618465.htmlhttp://www.cnblogs.com/imyijie/p/4478074.htmlhttps://segmentfault.com/a/1190000000377675?utm_source=tuicoolhttp://blog.csdn.net/gdouchufu/article/details/29242429http://blog.csdn.net/kimylrong/article/details/47665501http://www.jianshu.com/p/5a49b10f3cfdhttp://www.liaoxuefeng.com/article/001411309538536a1455df20d284b81a7bfa2f91db0f223000https://my.oschina.net/cloudcoder/blog/215169