list排序

    public static void main(String args[]){
        List<KcBean> list = new ArrayList<KcBean>();
        KcBean bean1 = new KcBean();
        bean1.setCj("52");
        KcBean bean2 = new KcBean();
        bean2.setCj("58.5");
        KcBean bean3 = new KcBean();
        bean3.setCj("53");
        
        list.add(bean1);
        list.add(bean2);
        list.add(bean3);
        
        Collections.sort(list);
        for (KcBean p : list) {
            System.out.println(p.getCj());
        }
        
    }

 

public class KcBean implements Comparable<KcBean>{   
....
....
....

 @Override
    public int compareTo(KcBean kcBean) {
        //return this.getCj().compareTo(kcBean.getCj());  //升序
        return kcBean.getCj().compareTo(this.getCj());  //降序
    }
}

 就是list中对象实现Comparable接口,然后使用Collections.sort(list)