groupentry.java

java图形化界面编程 功能和记事本通讯录相似 记录通讯人的姓名和联系方法等信息并提供查询

package elegate.cn.edu.nju;

import java.io.Serializable;
import java.util.LinkedList;

/**
 * a class describe a group entry
 * @author Elegate
 * @author cs department of NJU
 * @version 1.0
 */
final public class GroupEntry implements Serializable
{
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	/**
	 * group name of the group entry
	 */
	private String groupName;
	/**
	 * linked list to save group members' id
	 */
	private LinkedList<Long> groupMembers;
	
	/**
	 * create a group entry with group name specified
	 * @param groupName the group name
	 */
	public GroupEntry(String groupName)
	{
		if(groupName==null||groupName.length()==0)
			this.groupName="Group";
		else
			this.groupName=groupName;
		this.groupMembers=new LinkedList<Long>();
	}
	
	/**
	 * get the group name of the group entry
	 * @return the group name of the group entry
	 * @see #setGroupName(String)
	 */
	public String getGroupName()
	{
		return this.groupName;
	}
	
	/**
	 * set the group name of the group entry
	 * @param groupName the new group name
	 * @see #getGroupName()
	 */
	public void setGroupName(String groupName)
	{
		this.groupName=groupName;
	}
	
	public LinkedList<Long> getGroupMembers()
	{
		return this.groupMembers;
	}
	
	/**
	 * add a group member to the group
	 * @param id the id of an address entry
	 */
	public void addGroupMember(long id)
	{
		if(!this.groupMembers.contains(id))
			this.groupMembers.add(id);
	}
	
	/**
	 * remove an address entry from the group
	 * @param id the id of an address entry
	 */
	public void removeMember(long id)
	{
		this.groupMembers.remove(id);
	}
	/**
	 * overridden method <strong>equals</strong>
	 */
	public boolean equals(Object obj)
	{	
		if(obj==this)
			return true;
		if(obj==null)
			return false;
		if(this.getClass()!=obj.getClass())
			return false;
		GroupEntry group=(GroupEntry)obj;
		return group.groupName.equals(this.groupName);
	}
	/**
	 * overridden method <strong>toString</strong>
	 */
	public String toString()
	{
		/*return this.getClass().getName()+"[groupName="
		+this.groupName+",groupMembers="+this.groupMembers+"]";
		*/
		return groupName;
	}
}