List

        List<String> stringList0 = new ArrayList<String>();
        stringList0.add("aaa");
        stringList0.add("bbb");
        System.out.println(stringList0.toString());
        //  [aaa, bbb]


        List<String> stringList1 = Lists.newArrayList("aaa","bbb");
        System.out.println(stringList1.toString());
        // [aaa, bbb]

        List<String> stringList2 = Arrays.asList("aaa,bbb".split(","));
        System.out.println(stringList2.toString());
        // [aaa, bbb]

        List<String> stringList3 = Arrays.stream("aaa,bbb".split(",")).map(e->{return e+"aaa";}).collect(Collectors.toList());
        System.out.println(stringList3.toString());
        // [aaaaaa, bbbaaa]


        String str0 = Arrays.stream("aaa,bbb".split(",")).map(e->{return e+"aaa";}).collect(Collectors.joining(","));
        System.out.println(str0);
        // aaaaaa,bbbaaa

        String str1 = Lists.newArrayList("aaa","bbb").stream().map(e->{return e+"bbb";}).collect(Collectors.joining(","));
        System.out.println(str1);
        // aaabbb,bbbbbb


 // 以下都是 true
        System.out.println(StringUtils.isBlank(null));
        System.out.println(StringUtils.isBlank(""));
        System.out.println(StringUtils.isBlank(" "));
        System.out.println(StringUtils.isBlank("            "));
        System.out.println(StringUtils.isBlank("\n \r \t \f"));