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我有这个Java 6代码,我想将其转换为Java 8.

BigDecimal sumContributionPercentage = new BigDecimal(0);                   
if (hasElements(mandateDetails)) {
  for (InstrumentMandateDetail mandate: mandateDetails) {
    if(!(VERFI_STATUS_CLOSED.equals(mandate.getMandateVerificationStatusType().getCode()) ||
         VERFI_STATUS_REJECTED.equals(mandate.getMandateVerificationStatusType().getCode()))) {
      sumContributionPercentage = sumContributionPercentage.add(mandate.getContributionPercentage());
    }       
  }
}