java ArrayList按照某个属性升序排序

Posted 2021-07-05 zhangjin1120

• 后端返回的数据，有时候需要做排序检查，或者客户端自己写排序。按照Bean中的某一个属性生序排列。

public class ListSortTest {
    static class WorkBean {
       public int value;
       public String name;

        public WorkBean(int value, String name) {
            this.value = value;
            this.name = name;
        }
    }

    public static void main(String[] args) {
        ArrayList<WorkBean> beanList = new ArrayList<>();
        beanList.add(new WorkBean(1, "x1"));
        beanList.add(new WorkBean(2, "x2"));
        beanList.add(new WorkBean(3, "x3"));
        beanList.add(new WorkBean(3, "x3"));
        beanList.add(new WorkBean(2, "x2"));
        beanList.add(new WorkBean(1, "x1"));

        Collections.sort(beanList, new Comparator<WorkBean>() {
            @Override
            public int compare(WorkBean o1, WorkBean o2) {
                return o1.value - o2.value; //升序
//                return o2.value - o1.value; //降序
            }
        });

        for (WorkBean bean : beanList) {
            System.out.println(bean.value + " " + bean.name);
        }
    }
}