filereader.java

来自「JAVA 工作指南 可以说是程序员必备的东西哦」· Java 代码 · 共 31 行

import java.io.*;

public class FileReader {

    public static void main(String[] args) {
	try {
	    long dataPosition = 0;
	    int data = 0;
            RandomAccessFile raf = new RandomAccessFile("datafile", "r");

	    //Get the position of the data to read.
	    dataPosition = raf.readLong();

	    //Go to that position.
	    raf.seek(dataPosition);

	    //Read the data.
	    data = raf.readInt();
	    raf.close();

	    //Tell the world.
	    System.out.println("The data is: " + data);

	} catch (FileNotFoundException e) {
	    System.err.println("This shouldn't happen: " + e);
	} catch (IOException e) {
	    System.err.println("Writing error: " + e);
	}
    }
}