FileInputStream：针对文件的输入流BufferedInputStream：带有缓冲区的高效输入流 FileInputStream源码解析 publicclassFileInputStreamextendsInputStream{privatenativeintread0()throwsIOException;privatenativeintreadBytes(byteb[],intoff,intlen)throwsIOException;publicintread()throwsIOException{returnread0();}publicintread(byteb[...