comprehension

MapReduce的设计灵感来自于函数式编程，这里不打算提MapReduce，就拿python中的map()函数来学习一下。 文档中的介绍在这里： map( function , iterable , ... ) Apply function to every item of iterable and return a list of the results. If additional iterable arguments are passed, function must take that many arguments and is applied to the items from all iterables in parallel. If one iterable is shorter than another it is assumed to be extended with None items. If function is None , the identity function is assumed; if there are multiple arguments, map() returns a list consisting of tuples containing the corresponding items from all iterables (a

对于python的list，相信用过的人都知道有好些很cool的功能，我希望能把这些功能加入到java里面去。 我希望java能够支持一下的Python特性： public class Main{ //list define List k=[]; List k1=['1',2,3]; List k2=[k1,k2]; List<Integer> kk=[1,2,3,new Integer(4)]; //list assignment k=[1,'2',3,4,"a","b",6]; k1=k; //list get element int a=k[2]; a=k[-1]; k=k[0:-1]; k=k[2:]; k=k[:2]; k=k[::-1]; //reverse array k=k[1:5:2];// from element 1 to element 5, increase step is 2 //advanced assignment list k3=[i*i for i in k if i <3]; //add k=k+k1; //get length k.length(); //convert k.toString(); //toArrayList k.toarraylist() } 这样，需要修改Javac的Grammer。 Java SE7的语法：http:/