msdw_tms/src/test/java/com/msdw/tms/Main.java

package com.msdw.tms;

import com.msdw.tms.entity.ProjectEntity;
import org.springframework.util.StringUtils;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class Main {

    public static void main(String[] args) {

        List<ProjectEntity> project = new ArrayList<>();
        ProjectEntity p1 = new ProjectEntity();
        p1.setProjectid(1);
        p1.setProjectname("1");
        project.add(p1);

        ProjectEntity p2 = new ProjectEntity();
        p2.setProjectid(3);
        p2.setProjectname("3");
        project.add(p2);

        ProjectEntity p3 = new ProjectEntity();
        p3.setProjectid(2);
        p3.setProjectname("2");
        project.add(p3);

        project.sort(new Comparator<ProjectEntity>() {
            @Override
            public int compare(ProjectEntity o1, ProjectEntity o2) {
                if(StringUtils.isEmpty(o1.getProjectid()) || StringUtils.isEmpty(o2.getProjectid()) )
                    return  0;
                return o1.getProjectid().compareTo(o2.getProjectid());
            }
        });

        for (ProjectEntity pro:project) {
            System.out.println(pro);
        }
    }

}