菜鸟-，初学java者

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

public class Stream2 {

public static void main(String[] args)throws IOException { 

File  file =new File("D:\\HelloWorld.java");

if(!file.exists()){
try{
file.createNewFile();

}catch(IOException e ){
System.out.println("file  creart fail");
e.printStackTrace();

}
}
File file1=new File("D:\\HW.java");
if(!file.exists()){
try{
file.createNewFile();

}catch(IOException e ){
System.out.println("file  creart fail");
e.printStackTrace();

}
}

try{
FileInputStream in=new  FileInputStream(file);
FileOutputStream out=new FileOutputStream(file1);
byte [] bb = new byte[1];
int i=0;
int sum=0;
while((i=in.read(bb))!=-1){
sum=sum+i;
System.out.println(new String(bb,0,i));
out.write(bb);
}
out.close();
in.close();

System.out.println("字符长"+sum);}
catch(FileNotFoundException e)

{e.printStackTrace();}
catch(IOException e){
e.printStackTrace();
}

}

}