List<ResourceStandingBookVo> getResourceStandingBookVos(List<OrganizationLevelVo> vos, List<ResourceStandingBookVo> bookVos) { List<ResourceStandingBookVo> standingBookVos = new ArrayList<>(); for (int i = 0; i <vos.size() ; i++) { ResourceStandingBookVo resourceStandingBookVo = new ResourceStandingBookVo(); for (int j = 0; j < bookVos.size(); j++) { if (i==j) { if (vos.get(i).getOrgIds().contains(bookVos.get(j).getUnitId())) { ResourceStandingBookVo standingBookVo = MapperUtils.mapping(bookVos.get(j), ResourceStandingBookVo.class); standingBookVo.setUnitId(vos.get(i).getId()); standingBookVo.setUnit(vos.get(i).getOrgOtherName()); standingBookVos.add(standingBookVo); break; } else { resourceStandingBookVo.setUnitId(vos.get(i).getId()); resourceStandingBookVo.setUnit(vos.get(i).getOrgOtherName()); standingBookVos.add(resourceStandingBookVo); break; } } } }把这段代码优化一下

可以优化的地方有：

1. 双重循环可以改为单层循环，使用 Stream API 来实现

2. 避免在循环内创建对象，可以在循环外部创建对象，避免不必要的开销

3. 在最外层的循环中，可以使用变量来存储 vos.get(i)，避免多次调用

优化后的代码如下：

List<ResourceStandingBookVo> getResourceStandingBookVos(List<OrganizationLevelVo> vos, List<ResourceStandingBookVo> bookVos) {
    List<ResourceStandingBookVo> standingBookVos = new ArrayList<>();
    for (OrganizationLevelVo vo : vos) {
        ResourceStandingBookVo resourceStandingBookVo = new ResourceStandingBookVo();
        bookVos.stream()
                .filter(bookVo -> vos.indexOf(vo) == bookVos.indexOf(bookVo))
                .findFirst()
                .ifPresent(bookVo -> {
                    if (vo.getOrgIds().contains(bookVo.getUnitId())) {
                        ResourceStandingBookVo standingBookVo = MapperUtils.mapping(bookVo, ResourceStandingBookVo.class);
                        standingBookVo.setUnitId(vo.getId());
                        standingBookVo.setUnit(vo.getOrgOtherName());
                        standingBookVos.add(standingBookVo);
                    } else {
                        resourceStandingBookVo.setUnitId(vo.getId());
                        resourceStandingBookVo.setUnit(vo.getOrgOtherName());
                        standingBookVos.add(resourceStandingBookVo);
                    }
                });
    }
    return standingBookVos;
}