字母排序，对象字段排序

字母排序

        List list = new ArrayList();
        list.add("fdd");
        list.add("bbc");
        list.add("bac");
        list.add("abc");
        Collections.sort(list);
        Iterator iterator2 = list.iterator();
        while (iterator2.hasNext()) System.out.println(iterator2.next());

        for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i));
        }

实体类中某个字段按字母排序，并“other"字段排最后：

        List<EntityA> l = new ArrayList<>();
        List<EntityA> l1 = new ArrayList<>();
        List<EntityA> l2 = new ArrayList<>();
        List<EntityA> l3 = new ArrayList<>();
        EntityA a1 = new EntityA();
        a1.setTa("51");
        a1.setTb("阿布");
        a1.setTc("other");
        a1.setTd("dkwoiweoiei");
        EntityA a = new EntityA();
        a.setTa("51");
        a.setTb("阿布");
        a.setTc("bbc");
        a.setTd("dkwoiweoiei");
        EntityA b = new EntityA();
        b.setTa("12");
        b.setTb("保持");
        b.setTc("zba");
        b.setTd("ddssw");
        EntityA c = new EntityA();
        c.setTa("26");
        c.setTb("尺寸");
        c.setTc("qwe");
        c.setTd("adw");

        l.add(a);
        l3.add(a1);
        l1.add(c);
        l2.add(b);
        l.addAll(l1);
        l2.addAll(l);
        l3.addAll(l2);
        Iterator<EntityA> iterator = l3.iterator();
        EntityA otherTc = null;
        while (iterator.hasNext()) {
            EntityA entityA = iterator.next();
            if (entityA.getTc().equals("other")) {
                otherTc = entityA;
                iterator.remove();
                break;
            }
        }
        Collections.sort(l3);
        l3.add(otherTc);
        for (int i = 0; i < l3.size(); i++) {
            System.out.println(l3.get(i).getTc());
        }    

package com.example.demo;

import java.io.Serializable;

public class EntityA implements Serializable,Comparable<EntityA> {
    //点击File–Setting–Editor–Inspections–Java–Serialization issues–勾选Serializable class without"serialVersionUID"即可，然后点击OK
    //第二步：选中实体类类名按住Alt+Enter，选择条目，即可生成serialVersionUID
    private static final long serialVersionUID = -5787205392747829684L;
    private String tc;
    private String ta;
    private String tb;
    private String td;

    //get/set...

    @Override
    public int compareTo(EntityA o) {
        if(this.tc.compareTo(o.tc)<0)
            return -1;
        else if(this.tc.compareTo(o.tc)>0)
            return 1;
        else return 0;
    }
}