파일 입 출력 작업 (바이트 흐름)

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;


public class ArraysDemo{
	public static void main(String args[]) throws IOException{
		write1();
		read1();
		write2();
		read2();
	}
	
	public static void write1() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		//    File    
		OutputStream out=new FileOutputStream(f);
		out.write("hello".getBytes());
		out.close();
	}
	
	public static void write2() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		//    File    
		OutputStream out=new FileOutputStream(f,true);
		out.write("\r
hello".getBytes());//\r
  
		out.close();
	}
	
	public static void read1() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		//    File    
		InputStream input=new FileInputStream(f);
		byte b[]=new byte[(int)f.length()];
		input.read(b);
		input.close();
		System.out.println("read1():
"+new String(b));
	}
	
	public static void read2() throws IOException{
		File f = new File("d:"+File.separator+"text.txt") ;		//    File    
		InputStream input=new FileInputStream(f);
		byte temp=0;
		List<Byte> list=new ArrayList<Byte>();
		while((temp=(byte) input.read())!=-1){
			list.add(temp);
		}
		byte[] b=new byte[list.size()];
		for(int i=0,j=list.size();i<j;i++){
			b[i]=list.get(i);
		}
		input.close();
		System.out.println("read2():
"+new String(b));
	}
		
};
/**
read1():
hello
read2():
hello
hello
**/