Java（jdk1.8 above）中list.stream()的使用
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如何将对象list转为以某列为key，对象为value的map：
List<list> list = Lists.partition(this.trustContractList, Constant.ONE_THOUSAND);
for(List li:list){
Map contractMap = li.stream().collect(Collectors.toMap(TrustContractEx -> TrustContractEx.getProdContractNo(), TrustContractEx -> TrustContractEx));
}