RandomAccessFile 断点续传

package io1;


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


public class Demo3 {


  public static void main(String[] args) throws IOException {
    File file = new File("src");
    File file1 = new File("text1.txt");
    if(!file1.exists()){
      file1.createNewFile();
    }
    RandomAccessFile raf = 
      new RandomAccessFile(file1, "rw");
    raf.writeInt(-9);
    raf.writeDouble(11.2);
    raf.writeChar('中');
    raf.seek(0);
    
    int a = raf.readInt();
    double b = raf.readDouble();
    char c = raf.readChar();
    System.out.println(a+" ,"+ b+","+c);
    raf.close();
 
  }


}