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Stream流排序數(shù)組和List?詳解

更新時(shí)間：2022年09月21日 10:27:42 作者：李長(zhǎng)淵哦

這篇文章主要介紹了Stream流排序數(shù)組和List?詳解，文章圍繞主題展開詳細(xì)的內(nèi)容介紹，具有一定的參考價(jià)值，感興趣的小伙伴可以參考一下

一、對(duì)象單字段排序

        List<People> peopleList = Lists.newArrayList();
        peopleList.add(new People(1, "小王", 5));
        peopleList.add(new People(1, "小李", 4));
        peopleList.add(new People(2, "小張", 3));
        peopleList.add(new People(2, "小皇", 2));
        peopleList.add(new People(2, "小劉", 1));

        //單字段排序
        peopleList =  peopleList.stream().sorted(Comparator.comparing(People::getJgId)).collect(Collectors.toList());
        log.info(peopleList.toString());
        //這里是根據(jù)userId 進(jìn)行排序——降序排序  reversed()
        peopleList =  peopleList.stream().sorted(Comparator.comparing(People::getJgId).reversed()).collect(Collectors.toList());
        log.info(peopleList.toString());

二、多字段排序

        List<People> peopleList = Lists.newArrayList();
        peopleList.add(new People(1, "小王", 5));
        peopleList.add(new People(1, "小李", 4));
        peopleList.add(new People(2, "小張", 3));
        peopleList.add(new People(2, "小皇", 2));
        peopleList.add(new People(2, "小劉", 1));
        //這里是根據(jù)Id及jgId進(jìn)行聯(lián)合升序排序
        peopleList =  peopleList.stream().sorted(Comparator.comparing(People::getId).thenComparing(People::getJgId)).collect(Collectors.toList());
        log.info(peopleList.toString());
        //下面兩個(gè)結(jié)果都是以Id降序jgId升序排序的結(jié)果，但是查詢方式不同
        //先以id升序,升序結(jié)果進(jìn)行id降序,再進(jìn)行jgId升序
        peopleList =  peopleList.stream().sorted(Comparator.comparing(People::getId).reversed().thenComparing(People::getJgId)).collect(Collectors.toList());
        log.info(peopleList.toString());
        //先以id降序,再進(jìn)行jgId升序 **推薦使用該種方式**
        peopleList =  peopleList.stream().sorted(Comparator.comparing(People::getId,Comparator.reverseOrder()).thenComparing(People::getJgId)).collect(Collectors.toList());
        log.info(peopleList.toString());
        //先以id升序,再進(jìn)行jgId降序
        peopleList =  peopleList.stream().sorted(Comparator.comparing(People::getId).thenComparing(People::getJgId,Comparator.reverseOrder())).collect(Collectors.toList());
        log.info(peopleList.toString());