Java8对集合的处理(3)

1.根据某个属性拼接字符串

String names = personList.stream().map(p -> p.getName()).collect(Collectors.joining(","));

2.字符串拼接

String string = list.stream().collect(Collectors.joining("-"));

3.将集合中属性是BigDecimal的值累加

BigDecimal result = userList.stream().map(User::getMoney).reduce(BigDecimal.ZERO,BigDecimal::add);