List按屬性排序

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

public class TagBean {

	private String tagId;

	private int count;

	public String getTagId() {
		return tagId;
	}

	public void setTagId(String tagId) {
		this.tagId = tagId;
	}

	public int getCount() {
		return count;
	}

	public void setCount(int count) {
		this.count = count;
	}

	public TagBean() {
		super();
	}

	public TagBean(String tagId, int count) {
		super();
		this.tagId = tagId;
		this.count = count;
	}

	@Override
	public String toString() {
		return "TagBean [tagId=" + tagId + ", count=" + count + "]";
	}

	public static void main(String[] args) {
		List<TagBean> list = new ArrayList<>();
		list.add(new TagBean("tagId01", 100));
		list.add(new TagBean("tagId02", 520));
		list.add(new TagBean("tagId03", 10));
		list.add(new TagBean("tagId04", 430));
		list.add(new TagBean("tagId05", 950));
		Collections.sort(list, new Comparator<TagBean>() {
			@Override
			public int compare(TagBean o1, TagBean o2) {
				return o2.getCount() - o1.getCount();
			}
		});
		for (TagBean tagBean : list) {
			System.out.println(tagBean.toString());
		}
	}

}  

運行結果：

TagBean [tagId=tagId05, count=950]
TagBean [tagId=tagId02, count=520]
TagBean [tagId=tagId04, count=430]
TagBean [tagId=tagId01, count=100]
TagBean [tagId=tagId03, count=10]