gamescore.java

用J2ME编写的手机飞机空战小游戏,比较经典,与大家共享

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.rms.RecordStore;

/*====================================*/
/*  【游戏记录类：实现排名记录与显示功能。】  */
/*		      程序编写：励晓维		      */
/*		      2004-11-27 	          */
/*====================================*/
public class gameScore {
	String name;  //姓名
	int score;    //分数
	private RecordStore rs;
	protected boolean biger;
	
	private int id;         //记录ID
	protected int endId;    //取得下一个ID记录
	private String rsName;  //记录仓库名
	private byte[] tmpData; //临时字节数组
	Form f;
	Image competImg;
	ByteArrayInputStream bais;
	DataInputStream dis;
	ByteArrayOutputStream baos;
	DataOutputStream dos;

    /**=====构造器=====*/
public gameScore(int yourScore){
		this.score=yourScore;
		rsName="SScore";
	}

	/*===============================*/
	/*			  数据流  	         */
	/*===============================*/

    /**======输入======*/
	protected void readStream(byte[] data){
		bais=new ByteArrayInputStream(data);
		dis=new DataInputStream(bais);
	}
    /**======输出======*/
	protected void writeStream(){
		baos=new ByteArrayOutputStream();
		dos=new DataOutputStream(baos);
	}

	/*===============================*/
	/*			  比较记录内容	         */
	/*===============================*/
    protected boolean compareScore(){
    	rs=openRSAnyway(rsName);
    	try{
    		endId=getEndId();
	    	if(endId==1){  //没有记录
	    		biger=true;
	    	}else{  //有记录
	    		for(int i=1;i<endId;i++){
	    			byte[]tmp=rs.getRecord(i);
	    			int tmpscore=get(tmp);  //get方法
	    			if (score > tmpscore){  //如果大于
	    				id=i;  //位置
	    				biger=true;
	    				break;
	    			}else{  //不大于
	    				biger=false;
	    			}
	    		}
	    	}
	    	rs.closeRecordStore();
		}catch (Exception e){
			System.out.println("RcompareScore error!!");
		}
		return biger;
    }

    /**====写入记录====*/
    protected void writeToDate(String tmpName)
    {
    	rs=openRSAnyway(rsName); //打开
		name = tmpName;  //取得输入的姓名
		try 
		{
			endId=getEndId();  //总记录
			if(endId==1 || !biger)//（没有记录）或（记录数小于5但不大于）
			{  
				byte[] result=add();  //add方法
				rs.addRecord(result,0,result.length);  //添加
			}
			else
			{  //大于
				copyToBack();  //向后复制
				byte[] result=add();  //add方法
				rs.setRecord(id, result, 0, result.length);  //修改记录
			}
			rs.closeRecordStore();
		} catch (Exception e) {}
    }
    
    /**====显示排行====*/
    protected void showCompet(Graphics g)
    {
    	rs=openRSAnyway(rsName); //打开
    		try 
    		{
    			endId=getEndId();  //总记录
    			//System.out.println("showCompet endId "+endId);
    			//容纳记录的数组
    	    	String[]tmpName=new String[endId];  //名字
    	    	int[]tmpScore=new int[endId];  //得分
    			for(int i=1;i<endId;i++)
    			{
    				byte[] result=rs.getRecord(i);
    				readStream(result);  //数据流
        			tmpName[i-1]=dis.readUTF();
        			tmpScore[i-1]=dis.readInt();
        			bais.close();
        			dis.close();
    			}
    			rs.closeRecordStore();
    			paintCompet(g,tmpName,tmpScore);  //显示排名
    		} catch (Exception e) {}
    }

    /**===最多5条记录==*/
    private int getEndId(){
    	int tmpId;
		try	{
			tmpId = rs.getNextRecordID();
			if(tmpId<6)
	    		endId=tmpId;
	    	else
	    		endId=6;
		}catch (Exception e){
			System.out.println("getEndId error!!");
		}
    	return endId;
    }
    
    /**====复制记录===*/
    private void copyToBack()
    {
	    try	
	    {
			if (endId < 6)
			{  //小于6，先添加在修改
				for (int i = endId - 1; i >= id; i--)
				{
					byte[] tmp = rs.getRecord(i);
					if (i == endId - 1)  //向空的添加
						rs.addRecord(tmp, 0, tmp.length);
					else  //修改
						rs.setRecord(i + 1, tmp, 0, tmp.length);
				}
			}
			else
			{  //等于6，只修改
				for (int i = endId - 2; i >= id; i--)
				{
					byte[] tmp = rs.getRecord(i);
					rs.setRecord(i + 1, tmp, 0, tmp.length);
				}
			}
		}catch (Exception e){}
    }
    
    /**====显示排名===*/
    private void paintCompet(Graphics g,String[] tmpName,int[] tmpScore)
    {
    	try	
    	{
    		competImg=Image.createImage("/total_img.png");
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		g.drawImage(competImg,0,0,0);
		g.setColor(0x5033e6);
		for(int i=0;i<endId-1;i++)
		{
			g.drawString(i+1+"",6,30+18*i,0);  //排名
			g.drawString(tmpName[i],20,30+18*i,0);  //名字
			g.drawString(tmpScore[i]+"",100,30+18*i,0);  //得分
		}
		/**测试用遮挡屏幕*/
		g.setColor(255,255,255);
		g.fillRect(0,129,128,50);
		g.fillRect(128,0,52,128);
    }
    
	/*===============================*/
	/*			添加记录方法 	         */
	/*===============================*/
	public byte[] add()
	{
		writeStream();
		byte[] result=null;
		try 
		{
			dos.writeUTF(name);
			dos.writeInt(score);
			result=baos.toByteArray();
			baos.close();
			dos.close();
		} catch (IOException e) {}
		return result;
	}
	
	/**====取得数据===*/
	private int get(byte [] data)
	{
		int tmpScore=0;
		readStream(data);
		try 
		{
			String tmpName=dis.readUTF();
			tmpScore=dis.readInt();
			bais.close();
			dis.close();
		} catch (IOException e) {}
		return tmpScore;
	}

	/**==打开记录仓库=*/
	public RecordStore openRSAnyway(String rsName){
		RecordStore rs=null;
		//名称大于32个字符就不接受
		if(rsName.length()>32)
			return null;
		try {
			rs=RecordStore.openRecordStore(rsName,true);
			return rs;
		} catch (Exception e) {
			System.out.println("RecordStore open error!!");
			return null;
		}
	}
	
	/**==删除记录仓库=*/
	public boolean deleteRS(String rsName){
        //名称大于32个字符就否
		if(rsName.length()>32)
			return false;
		//删除
		try {
			RecordStore.deleteRecordStore(rsName);
			return true;
		} catch (Exception e) {
			System.out.println("RecordStore delete error!!");
			return false;
		}
	}
}