英文:
How does the FileInputStream class knows the offset when the read method is called again and again?
问题
以下是翻译好的部分：
这里我使用FileInputStream类从input.txt文件中读取数据。read方法被调用了两次。当第二次调用read方法时，输入流对象如何知道它需要读取第二个字符？我的意思是输入流对象是否维护了偏移量？
package streams;
import java.io.*;
public class Main {
public static void main(String[] args) throws IOException {
read();
}
private static void read() throws IOException {
InputStream inputStream = new FileInputStream("src/main/resources/input.txt");
int data;
data = inputStream.read();
System.out.println(data);
data = inputStream.read();
System.out.println(data);
inputStream.close();
}
}
英文:
Here I am using FileInputStream class to read data from input.txt. read method is called twice. How does the inputStream object know that it has to read the second character when the read method is called the second time? I mean does inputStream object maintain the offset?
package streams;
import java.io.*;
public class Main {
public static void main(String[] args) throws IOException {
read();
}
private static void read() throws IOException {
InputStream inputStream = new FileInputStream("src/main/resources/input.txt");
int data;
data = inputStream.read();
System.out.println(data);
data = inputStream.read();
System.out.println(data);
inputStream.close();
}
}
答案1
得分: -1
是的，FileInputStream 会保留对某个操作 read 方法的操作系统文件句柄的引用。这个文件句柄将保持文件中的偏移量，并且会将其根据实际读取的字节数向前移动。
英文:
Yes the the FileInputStream keeps a reference to a some OS-file handle on which is operates the read method. This file-handle will maintain the offset in the file and will forward it by howerver many bytes were read.
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