i/o

package com.company;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Main {

    public static void main(String[] args) throws IOException {
	// write your code here

        FileInputStream fileMasuk = null;
        FileOutputStream fileKeluar = null;

        // membuka file
        fileMasuk = new FileInputStream("datain.txt");

        //membaca file
        int data = fileMasuk.read();

        while (data != -1){
            System.out.println((char)data);
            data = fileMasuk.read();
        }

        //menutup file
        fileMasuk.close();

        //
        try {
            //membuak file
            fileMasuk = new FileInputStream("datain.txt");
            fileKeluar = new FileOutputStream("datakeluar.txt");

            //membaca file
            int data2 = fileMasuk.read();

            while (data2 != -1) {
                fileKeluar.write(data2);
                data2 = fileMasuk.read();
            }
        }finally {
            if (fileMasuk != null) {
                fileMasuk.close();
            }

            if (fileKeluar !=null){
                fileMasuk.close();
            }
        }

        //

        try ( FileInputStream in = new FileInputStream("datain.txt");
              FileOutputStream out = new FileOutputStream("dataout.txt")){

            int data3 = in.read();

            while (data3 != -1){
                out.write((char)data3);
                data3 = in.read();
            }

        }


    }
}