Guava集合工具详解-优快云博客

本文链接：https://blog.youkuaiyun.com/Wuaner/article/details/83454074

本文介绍了Guava集合工具中的一些高级用法，包括如何使用Lists、Maps和Collections2进行数据转换和过滤，以及如何利用Multimaps和BidirectionalMaps解决复杂的数据结构问题。

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[b]集合工具：[/b][quote]


                List<String> companyNames = Lists.transform(companyList, new Function<Company, String>() {
                    public String apply(Company input) {
                        return input.getName();
                    }});


Map<Integer, User> filteredNewMembers = Maps.filterKeys(rawNewMembers, Predicates.in(filteredNewMemberIds));


                    Map<Integer, User> newMembers4CurUser = Maps.filterValues(newMembers, new Predicate<User>() {

                        @Override
                        public boolean apply(User newMember) {
                            return compare(provinceCode, newMember.getProvinceCode())
                                    && compare(cityStr, newMember.getCityStr())
                                    && compare(industryCode, newMember.getIndustryCode());
                        }

                        private boolean compare(String str1, String str2) {
                            if(StringUtils.isBlank(str1)) {
                                return true;
                            } else {
                                if(str1.equals(str2)) {
                                    return true;
                                } else {
                                    return false;
                                }
                            }
                        }
                    });


                Collections2.filter(recCompanyItems, new Predicate<CompanyItemVO>() {
                    @Override
                    public boolean apply(CompanyItemVO item) {
                        if (excludedCompanyIds.contains(item.getCompanyId())) {
                            return false;
                        }
                        return true;
                    }
                }));

OR

                Iterables.filter(recCompanyItems, new Predicate<CompanyItemVO>() {
                    @Override
                    public boolean apply(CompanyItemVO item) {
                        if (excludedCompanyIds.contains(item.getCompanyId())) {
                            return false;
                        }
                        return true;
                    }
                }));

[/quote]

Multimaps:
[url]http://java.dzone.com/articles/multimaps-google-guava[/url]

Bidirectional Maps:
[url]http://java.dzone.com/articles/guavas-bidirectional-maps[/url]