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