datastream.java

学了2个月java 练习用~ 可以看下 希望同意

import java.io.*;
import java.util.*;

public class dataStream
{
	public static void main(String[] args) throws Exception
	{
		data("1234");
	}

	public static void data(String st) throws Exception{
		File dt=new File("data.txt");
		if(!dt.exists()) dt.createNewFile();
		OutputStreamWriter out=new OutputStreamWriter(new FileOutputStream(dt));
		out.write(st,0,st.length());
		out.close();
		InputStreamReader in=new InputStreamReader(new FileInputStream(dt));
		BufferedReader innow=new BufferedReader(in);
		System.out.println(innow.readLine());
		in.close();



	}
}