随机访问RandomAccessFile

public native long getFilePointer() throws IOException;//当前文件的指针位置是

import java.io.IOException;
import java.io.RandomAccessFile;

public class IntegerDemo {
	public static void main(String[] args) throws IOException {
		myWrite();
	}

	private static void myWrite() throws IOException {
		// TODO Auto-generated method stub
		RandomAccessFile raf = new RandomAccessFile("E:\zikao\file\cs.txt", "rw");

		raf.writeInt(100);
		raf.writeChar('a');
		raf.writeUTF("中国");

		System.out.println("当前文件的指针位置是：" + raf.getFilePointer());

		raf.close();
	}
}