index.java

基于j2me的电话本基于j2me的电话本

package com.hziee.phone_book.model;

import java.io.*;
//索引类
public class Index {
	private String key;//关键字
    private int recordID;//记录ID

    public Index(String key, int recordID)
    {
        this.key = key;
        this.recordID = recordID;
    }

    private Index()
    {
     }

    /**
     * @return 返回 key.
     */
    public String getKey()
    {
        return key;
    }
   
    /**
     * @param 设置 key.
     */
    public void setKey(String key)
    {
        this.key = key;
    }
   
    /**
     * @return 返回 recordID.
     */
    public int getRecordID()
    {
        return recordID;
    }
   
    /**
     * @param 设置 recordID .
     */
    public void setRecordID(int recordID)
    {
        this.recordID = recordID;
    }
  
    /**把内存中的数据读到字节数组中*/
    public byte[] serialize() throws IOException
    {
    /** 在创建它的实例时，程序内部创建一个byte型别数组的缓冲区，
    然后利用ByteArrayOutputStream和
    ByteArrayInputStream的实例向数组中写入或读出byte型数据*/
    	//字节流转化
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        dos.writeUTF(key);
        dos.writeInt(recordID);
        baos.close();
        dos.close();

        return baos.toByteArray();
    }
  
    /**又把字节数组中的字节以流的形式读出,实现了对同一个字节数组的操作.*/
    public static Index deserialize(byte[] data) throws IOException
    {//读出字节流
        ByteArrayInputStream bais = new ByteArrayInputStream(data);
        DataInputStream dis = new DataInputStream(bais);
     //创建索引实例
        Index index = new Index();
     //当前实例读取的属性
        index.key = dis.readUTF();
        index.recordID = dis.readInt();
	bais.close();
	dis.close();
        return index;
    }

    public static boolean matches(byte[] data, String key,int type) throws IOException
    {
    	//将data字节流转换为输入流
        ByteArrayInputStream bais = new ByteArrayInputStream(data);
        DataInputStream dis = new DataInputStream(bais);
        
        if(type == 101)
        {
            return (dis.readUTF()).equals(key);
        }
        else if(type == 102)
        {
            return (dis.readUTF()).startsWith(key);
        }
        return false;
    }

}