java统计一个对象大小

public static  int  getByteSize(Object  data){
        int byteSize=0;
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();  
            ObjectOutputStream os = new ObjectOutputStream(baos);  
            os.writeObject(data);  
            os.close(); 
            byteSize=baos.size();
            System.out.println("ByteSizeUtil_getByteSize_datas>>>>>>>>>>>>【"+byteSize+"】字节");
            baos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }  
        return byteSize;
    }