JAVA Stream 排序汇总Demo，最大值，最小值，正序和倒序

利用Java Stream排序 ，以及倒序，获取排序的最大值，最小值，建议使用排序12345和9，10，11

public static void main(String[] args) {
        FormOutcome formOutcome = new FormOutcome();
        formOutcome.setId("sdfsdf");
        formOutcome.setName("sdfsdf");
        FormOutcome formOutcome1 = new FormOutcome();
        formOutcome1.setId("sdfsdf1");
        formOutcome1.setName("sdfsdf1");
        FormOutcome formOutcome3 = new FormOutcome();
        formOutcome3.setId("sdfsdf3");
        formOutcome3.setName("sdfsdf3");
        FormOutcome formOutcome2 = new FormOutcome();
        formOutcome2.setId("sdfsdf2");
        formOutcome2.setName("sdfsdf2");
        List formOutcomeDTOList = new ArrayList<>(Arrays.asList(formOutcome,formOutcome1,formOutcome2,formOutcome3));
        //排序1
        Collections.sort(formOutcomeDTOList, new Comparator() {
            @Override
            public int compare(FormOutcome o1, FormOutcome o2) {
                return o1.getName().compareTo(o2.getName());
            }
        });
        System.out.println("排序1："+formOutcomeDTOList);


        //排序2
        List historyDto2 = formOutcomeDTOList.stream().sorted(Comparator.comparing(FormOutcome::getName)).collect(Collectors.toList());
        System.out.println("排序2，正序："+historyDto2);
        //排序3，倒序
        List historyDto3 = formOutcomeDTOList.stream().sorted(Comparator.comparing(FormOutcome::getName).reversed()).collect(Collectors.toList());
        System.out.println("排序3，倒序："+historyDto3);

        //排序4，正序 第一个
        List historyDto4 = formOutcomeDTOList.stream().sorted(Comparator.comparing(FormOutcome::getName)).limit(1).collect(Collectors.toList());
        System.out.println("排序4，正序第一个："+historyDto4);

        //排序5 ，倒序 第一个
        List historyDto5 = formOutcomeDTOList.stream().sorted(Comparator.comparing(FormOutcome::getName).reversed()).limit(1).collect(Collectors.toList());
        System.out.println("排序5,倒序第一个："+historyDto5);
        //排序6
        List historyDto6 = formOutcomeDTOList.stream().sorted((FormOutcome o1, FormOutcome o2) -> {return o1.getName().compareTo(o2.getName());}).collect(Collectors.toList());
        System.out.println("排序6："+historyDto6);
        //排序7
        List historyDto7 = formOutcomeDTOList.stream().sorted((o1, o2) -> {return o1.getName().compareTo(o2.getName());}).collect(Collectors.toList());
        System.out.println("排序7："+historyDto7);
        //排序8
        List historyDto8 = formOutcomeDTOList.stream().sorted((o1, o2) -> o1.getName().compareTo(o2.getName())).collect(Collectors.toList());
        System.out.println("排序8："+historyDto8);
        //排序9， 最大值
        Optional historyDto9 = formOutcomeDTOList.stream().max((o1, o2) -> o1.getName().compareTo(o2.getName()));
        System.out.println("排序9,max："+historyDto9);
        //排序10， 最大值
        Optional historyDto10 = formOutcomeDTOList.stream().max(Comparator.comparing(FormOutcome::getName));
        System.out.println("排序10,max："+historyDto10);
        //排序11，最小值
        Optional historyDto11 = formOutcomeDTOList.stream().min(Comparator.comparing(FormOutcome::getName));
        System.out.println("排序11,min："+historyDto11);
    }

 其中，FormOutcome.java 如下：

@Data
public class FormOutcome {

    private String id;

    private String name;

}

执行结果如下： 

排序1：[FormOutcome(id=sdfsdf, name=sdfsdf), FormOutcome(id=sdfsdf1, name=sdfsdf1), FormOutcome(id=sdfsdf2, name=sdfsdf2), FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序2，正序：[FormOutcome(id=sdfsdf, name=sdfsdf), FormOutcome(id=sdfsdf1, name=sdfsdf1), FormOutcome(id=sdfsdf2, name=sdfsdf2), FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序3，倒序：[FormOutcome(id=sdfsdf3, name=sdfsdf3), FormOutcome(id=sdfsdf2, name=sdfsdf2), FormOutcome(id=sdfsdf1, name=sdfsdf1), FormOutcome(id=sdfsdf, name=sdfsdf)]
排序4，正序第一个：[FormOutcome(id=sdfsdf, name=sdfsdf)]
排序5,倒序第一个：[FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序6：[FormOutcome(id=sdfsdf, name=sdfsdf), FormOutcome(id=sdfsdf1, name=sdfsdf1), FormOutcome(id=sdfsdf2, name=sdfsdf2), FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序7：[FormOutcome(id=sdfsdf, name=sdfsdf), FormOutcome(id=sdfsdf1, name=sdfsdf1), FormOutcome(id=sdfsdf2, name=sdfsdf2), FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序8：[FormOutcome(id=sdfsdf, name=sdfsdf), FormOutcome(id=sdfsdf1, name=sdfsdf1), FormOutcome(id=sdfsdf2, name=sdfsdf2), FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序9,max：Optional[FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序10,max：Optional[FormOutcome(id=sdfsdf3, name=sdfsdf3)]
排序11,min：Optional[FormOutcome(id=sdfsdf, name=sdfsdf)]