I/O

package qwe;
import java.io.;
public class Qwe {
public static void main(String[] args) throws IOException {
File f=new File("C:\data.txt");
try {
FileOutputStream out=new FileOutputStream(f);
byte str[]="12345abcdef@#%&软件工程".getBytes();
out.write(str);
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try{
FileInputStream in=new FileInputStream(f);
byte byt[]=new byte[1024];
int len=in.read(byt);
String ss = null;
System.out.println("文件中的信息是："+ ss);
in.close();
}catch(Exception e){
e.printStackTrace();
}
}

}