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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;


public class copy {
public static void main(String[] args) throws IOException {
File filein=new File("D:\\in.txt");
File fileout=new File("D:\\out.txt");
try {
FileReader fr=new FileReader(filein);
FileWriter fw=new FileWriter(fileout);
BufferedReader br=new BufferedReader(fr);
BufferedWriter bw=new BufferedWriter(fw);
String str=null;
while((str=br.readLine())!=null){
System.out.println(str);
bw.write(str+"\n");
}
br.close();
bw.close();
} catch (FileNotFoundException e) {

e.printStackTrace();
}
}

}

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Java code

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