8.6randomaccessfiledemo.java

来自「JAVA程序设计的源代码」· Java 代码 · 共 27 行

import java.io.RandomAccessFile;
import java.io.FileNotFoundException;
import java.io.IOException;
public class RandomAccessFileDemo{
public static void main(String []args){
RandomAccessFile randomAccessFile=null;    
try{
randomAccessFile=new RandomAccessFile("student.dat","rw");    //以读写方式打开文件
randomAccessFile.writeInt(100);    //按照类型写文件
randomAccessFile.writeChar('a');
randomAccessFile.seek(4);    //移动文件指针
char charData=randomAccessFile.readChar( );    //随机读取文件内容
System.out.println("charData = "+charData);
}catch (FileNotFoundException e) {    //捕获文件未找到异常
e.printStackTrace( );
}catch(IOException e){    //捕获输入输出异常
e.printStackTrace( );
}finally {
if (randomAccessFile!=null) {
try {
randomAccessFile.close( );
}catch (IOException e){}
}
}
}
}