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// 求工资之和方式1: Optional<Integer> sumSalary = personList.stream().map(Person::getSalary).reduce(Integer::sum); // 求工资之和方式2: Integer sumSalary2 = personList.stream().reduce(0, (sum, p) -> sum += p.getSalary(), (sum1, sum2) -> sum1 + sum2); // 求工资之和方式3: Integer sumSalary3 = perso... 阅51 转1 评0 公众公开 21-02-01 11:22 |