Java:java8 lambda retrolambda

文章来自:http://blog.csdn.net/intbird
github:https://github.com/intbird/JAVA8Lambda

import java.util.Arrays;import java.util.HashSet;import java.util.List;import java.util.Set;import java.util.concurrent.Callable;import java.util.function.Consumer;import java.util.function.Function;import java.util.function.Predicate;import java.util.function.Supplier;public class Java8Lambda {    public static void main(String[] args){        //1        new Thread(()-> {System.out.println("hello intbird!");}).start();        //2        //JButton button = new JButton("show");        //button.addActionListener( q -> System.out.print("clickButton") );        //3        List list = Arrays.asList("1", "2", "3", "4");        list.forEach( (n) -> {            System.out.println(n);        });        //4 list规则        Predicate<List> condition = (n) -> n.size()>2; //>5        list.stream().filter((x) -> condition.test(list))               .forEach(name -> System.out.print(name));        //5 list item规则        Predicate<String> startWithIndex2 = (n) -> n == "2";        Predicate<String> lengthThen5 = (str) -> str.length()>0;        Predicate<String> condition1 = startWithIndex2.and(lengthThen5);        list.stream()                .filter(condition1)              .forEach(name -> System.out.println(name));        //6 list map修改        list.stream().map((o)-> o +"_index")            .forEach(System.out::println);        //7 list reduce          String listToString = list.stream().map((o) -> o + "index")                  .reduce((a,b) -> a + "_\r\n_" + b)  //.reduce(((int a, int b) -> a + b)                  .get().toString();          Consumer<String> out = System.out::println;          out.accept(listToString);        //1:输入且返回        Function<String[],String> test = Java8Lambda::method;        String result = test.apply(new String[]{"hello"," ","intbird"});        System.out.println(result);        //2:输入无返回        Consumer<String> test1 = System.out::println;        test1.accept("hello intbird!");        //3:无输入有返回        Callable<String> test2 = Java8Lambda::method;        try{            System.out.println(test2.call());        }catch (Exception ex){        }        Supplier<String> test3 = Java8Lambda::method;        System.out.println(test3.get());        //4:检查        Set<String> set = new HashSet<>();        set.addAll(Arrays.asList("hello"," ","intbird"));        Predicate<String> pred = set::contains;        boolean isHas = pred.test("hello");        System.out.print(isHas);    }    //part 1    //:://    一个静态方法（类名：：methname）的一个实例方法//    特定的对象（instanceref：：methname）一个超棒的方法//    特定对象（超：：methname）的一个实例方法//    某一特定类型的任意对象（类名：：methname）一类//    建设者参考（类名：：新）数组构造函数//    参考（类型名[ ]：：新）    //part 2    private static String method(String...text){        return text[0]+text[1]+text[2];    }    private static String method(){        return "hello intbird!";    }}