JAVA中如何生成TXT文件并且写入一些 字符串?

Question

先建立一个File对象,然后用流写进去try{
File f=new File("classjava.txt");
FileOutputStream fos=new FileOutputStream(f);
DataOutputStream out=new DataOutputStream(fos);
out.writerUTF("hello,classjava");
}catch(IOException)
{}

Answer 1

RandomAccessFile rf=null;
try
{
rf=new RandomAccessFile("error.txt","rw");
rf.seek(rf.length());
rf.writeBytes("\n Hello");
rf.writeBytes("\n World");
rf.close();
}
catch(IOException ioe)
{
writeErr(ioe);
}

Answer 2

import java.io.*;class IOTest
{
public static void main(String[] args) throws IOException
{
FileOutputStream f_write = new FileOutputStream("d:/stream.txt");
DataOutputStream dos = new DataOutputStream(f_write);

InputStreamReader read = new InputStreamReader(System.in);
BufferedReader istr = new BufferedReader(read);

System.out.println("Input:");
String str ;
str = String.valueOf(istr.readLine());
try
{
dos.writeBytes(str);
 }
catch(Exception e) {throw new InternalError("Unexpected CloneNotSUpportedException: " + e.getMessage());}
finally
{
dos.close();
 }
 
FileInputStream f_read = new FileInputStream("d:/stream.txt");
DataInputStream dis = new DataInputStream(f_read);
try
{
System.out.println(dis.readLine());
 }
catch(Exception e)  {throw new InternalError("Unexpected CloneNotSUpportedException: " + e.getMessage());}
    finally
    {
     dis.close();
     }
 }
 }能读能写！