public?static?void?copyFile(File?srcFile,File?destFile)throws?IOException{
		if(!srcFile.exists()){
			throw?new?IllegalArgumentException("文件："+srcFile+"不存在");
		}
		if(!srcFile.isFile()){
			throw?new?IllegalArgumentException(srcFile+"不是文件");
		}
		FileInputStream?in?=?new?FileInputStream(srcFile);
		FileOutputStream?out?=?new?FileOutputStream(destFile);
		byte[]?buf?=?new?byte[8*1024];
		int?b;
		while((b=in.read(buf,0,buf.length))!=-1){
			out.write(buf,0,b);
			out.flush();
		}
		in.close();
		out.close();
	}

誰能幫我講一下這個是如何從srcFile中讀取之后寫到destFile中去的呢，我只看到了讀的操作，寫操作不是寫到buf數(shù)組里了嗎