JAVA中读取文件信息

Question

FileInputStream fis = new FileInputStream();
int t = fis.read;
如何看read方法返回值是int类型的数?源码没有实现?

Answer 1

read方法是抽象类InputStream的抽象方法，在FileInputStream有实现 public int read() throws IOException { return read0(); } private native int read0() throws IOException; 要看native方法需要下载完整的OpenJDK源码包可以查看