randomAccessFile
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package day22.randomAccessFile;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
public class RandomAccessFileDemo {
public static void main(String[] args) throws IOException {
// write();
reader();
}
private static void reader() throws IOException {
RandomAccessFile rm = new RandomAccessFile("raf.txt", "rw");
// int i = rm.readInt();
// System.out.println(i);
// System.out.println("当前文件的指针位置是:"+rm.getFilePointer()); //4
// char c = rm.readChar();
// System.out.println(c);
// System.out.println("当前文件的指针位置是:"+rm.getFilePointer()); //6
// String s = rm.readUTF();
// System.out.println("当前文件的指针位置是:"+rm.getFilePointer()); //14
rm.seek(4);
System.out.println(rm.readChar());
}
private static void write() throws IOException {
RandomAccessFile rm = new RandomAccessFile("raf.txt", "rw");
rm.writeInt(65);
rm.writeChar('s');
rm.writeUTF("中国");//写入字符串是utf-8编码的
rm.close();
}
}
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
public class RandomAccessFileDemo {
public static void main(String[] args) throws IOException {
// write();
reader();
}
private static void reader() throws IOException {
RandomAccessFile rm = new RandomAccessFile("raf.txt", "rw");
// int i = rm.readInt();
// System.out.println(i);
// System.out.println("当前文件的指针位置是:"+rm.getFilePointer()); //4
// char c = rm.readChar();
// System.out.println(c);
// System.out.println("当前文件的指针位置是:"+rm.getFilePointer()); //6
// String s = rm.readUTF();
// System.out.println("当前文件的指针位置是:"+rm.getFilePointer()); //14
rm.seek(4);
System.out.println(rm.readChar());
}
private static void write() throws IOException {
RandomAccessFile rm = new RandomAccessFile("raf.txt", "rw");
rm.writeInt(65);
rm.writeChar('s');
rm.writeUTF("中国");//写入字符串是utf-8编码的
rm.close();
}
}
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