List<EntityTest> listTest = listSource.stream().filter(p -> p.getId() == 123).sorted(Comparator.comparing(EntityTest::getAge).reversed()).toList();
var sumValue = listTest.stream().mapToDouble(EntityTest::getMoney).sum();
JavaStreamAPI实例:筛选、排序与求和
List<EntityTest> listTest = listSource.stream().filter(p -> p.getId() == 123).sorted(Comparator.comparing(EntityTest::getAge).reversed()).toList();
var sumValue = listTest.stream().mapToDouble(EntityTest::getMoney).sum();

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