List装的是对象 排序问题

项目当中需要用到对对象排序，而这时的对象已经装到list中。怎样进行排序呢？

1.将实体implements Comparable,并实现其comparaTo()方法

package com.itbbs.model;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.Transient;

import org.hibernate.annotations.Type;

@Entity
public class News implements Comparable<Object> {

	private Category category;

	private int clickNum;

	private String content;

	private Date date;

	private int id;

	private String img;

	private String name;

	private String title;

	private int type;

	private User user;

	private Boolean headline;

	public News() {
	}

	public News(int id, String title) {
		super();
		this.id = id;
		this.title = title;
	}

	@ManyToOne
	@JoinColumn(name = "categoryId", referencedColumnName = "id")
	public Category getCategory() {
		return category;
	}

	public int getClickNum() {
		return clickNum;
	}

	@Lob
	@Type(type = "text")
	public String getContent() {
		return content;
	}

	public Date getDate() {
		return date;
	}

	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}

	@Transient
	public String getImg() {
		return img;
	}

	public String getName() {
		return name;
	}

	public String getTitle() {
		return title;
	}

	public int getType() {
		return type;
	}

	// 默认为eager 记住lazy
	@ManyToOne
	@JoinColumn(name = "userId", referencedColumnName = "id")
	public User getUser() {
		return user;
	}

	public void setCategory(Category category) {
		this.category = category;
	}

	public void setClickNum(int clickNum) {
		this.clickNum = clickNum;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public void setId(int id) {
		this.id = id;
	}

	public void setImg(String img) {
		this.img = img;
	}

	public void setName(String name) {
		this.name = name;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public void setType(int type) {
		this.type = type;
	}

	public void setUser(User user) {
		this.user = user;
	}

	public void setHeadline(Boolean headline) {
		this.headline = headline;
	}

	public Boolean getHeadline() {
		return headline;
	}

	public int compareTo(Object o) {

		News others = null;
		if (o instanceof News) {
			others = (News) o;
		}

		return this.type - others.type;
	}

}

在项目中调用就很简单了。

		List<News> tranfer = this.managerService.headline();

		Collections.sort(tranfer);/* 排序 in type */