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sorted 方法用于元素排序 一、升序 List userList = new ArrayList(); // userInfo字段 UserId; Age; NickName; Sex 1:男 2:女; moneny零花钱 userList.add(new userInfo(1,24,"小明",1,new BigDecimal("11"))); userList.add(new userInfo(2,22,"小红",2,new BigDecimal("22"))); userList.add(new userInfo(3,24,"小张",1,new BigDecimal("33"))); List integers = Arrays.asList(1, 2, 3, 4); //年龄升序 List userList1 = userList.stream() .sorted(Comparator.comparing(userInfo::getAge)) .collect(Collectors.toList()); List filter1 = integers.stream() .sorted(Comparator.comparing(Integer::intValue)) .collect(Collectors.toList()); 复制代码 二、降序 reversed List userList2 = userList.stream() .sorted(Comparator.comparing(userInfo::getAge).reversed()) .collect(Collectors.toList()); List filter2 = integers.stream() .sorted(Comparator.comparing(Integer::intValue).reversed()) .collect(Collectors.toList()); 复制代码 三、多字段排序关键字thenComparing 1.先以年龄升序 2.当年龄相同时,在以零花钱升序 List userList3 = userList.stream() .sorted(Comparator.comparing(userInfo::getAge).thenComparing(userInfo::getMoney)) .collect(Collectors.toList()); 复制代码 四、多字段区分升序降序关键字thenComparing、Comparator.reverseOrder() 1.先以年龄升序 2.当年龄相同时,在以零花钱降序 Comparator.reverseOrder() List userList3 = userList.stream() .sorted(Comparator.comparing(userInfo::getAge).thenComparing(userInfo::getMoney,Comparator.reverseOrder())) .collect(Collectors.toList()); 复制代码 |
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