A simple, 2 end bit steganography program

Steggysteg.java

import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

import javax.imageio.ImageIO;

public class Steggysteg {
	private static Scanner scanner = new Scanner(System.in);
	
	private static BufferedImage readImage(String path) {
		BufferedImage image = null;
		try {
			image = ImageIO.read(new File(path));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return image;
	}
	
	@SuppressWarnings("resource")
	private static BufferedImage encode(BufferedImage image, String path) {
		//Reads file
		BufferedReader reader = null;
		ArrayList<String> lines = new ArrayList<String>();
		try {
			reader = new BufferedReader(new FileReader(path));
			for (String line = ""; line != null; line = reader.readLine()) {
				lines.add(line + "\n");
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		//Translates to binary
		ArrayList<String[]> binary = new ArrayList<String[]>();
		for (int i = 0; i < lines.size(); i++) {
			String[] array = new String[lines.get(i).length()];
			byte[] bytes = lines.get(i).getBytes();
			for (int j = 0; j < bytes.length; j++) {
				array[j] = Integer.toBinaryString((int)bytes[j]);
				while (array[j].length() < 8) {
					array[j] = "0" + array[j];
				}
			}
			binary.add(array);
		}
		//Alters pixels
		int x = 0, y = 0;
		for (int lineNum = 0; lineNum < binary.size(); lineNum++) {
			for (int charNum = 0; charNum < binary.get(lineNum).length; charNum++) {
				for (int bitNum = 0; bitNum < 8; bitNum += 2) {
					String biPix = Integer.toBinaryString(image.getRGB(x, y));
					biPix = biPix.substring(0, biPix.length() - 2);
					biPix += binary.get(lineNum)[charNum].substring(bitNum, bitNum + 2);
					image.setRGB(x, y, (int)Long.parseLong(biPix, 2));
					x++;
					if (x == image.getWidth()) {
						x = 0;
						if (y == image.getHeight() - 1) {
							System.out.println("No more space on image.");
							break;
						}
						y++;
					}
				}
			}
		}
		return image;
	}
	
	private static void save(BufferedImage image, String path) {
		File outputfile = new File(path);
	    try {
			ImageIO.write(image, "png", outputfile);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	private static void decode(BufferedImage image, String path) {
		int size = image.getWidth() * image.getHeight();
		size -= size % 8;
		ArrayList<String> strings = new ArrayList<String>();
		for (int i = 0; i < size; i += 4) {
			StringBuilder binaryChar = new StringBuilder();
			for (int j = 0; j < 4; j++) {
				int x = (i + j) % image.getWidth();
				int y = (i + j) / image.getWidth();
				String str = Integer.toBinaryString(image.getRGB(x, y));
				binaryChar.append(str.substring(str.length() - 2));
			}
			strings.add(binaryChar.toString());
		}
		StringBuilder out = new StringBuilder();
		for (int i = 0; i < strings.size(); i++) {
			String letter = "" + (char)(byte)Integer.parseInt(strings.get(i), 2);
			strings.set(i, letter);
			out.append(strings.get(i));
		}
		BufferedWriter writer = null;
		try {
			writer = new BufferedWriter(new FileWriter(path));
			writer.write(out.toString());
			writer.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	private static void clear(BufferedImage image, String path) {
		for (int x = 0; x < image.getWidth(); x++) {
			for (int y = 0; y < image.getHeight(); y++) {
				String biPix = Integer.toBinaryString(image.getRGB(x, y));
				biPix = biPix.substring(0, biPix.length() - 2) + "00";
				image.setRGB(x, y, (int)Long.parseLong(biPix, 2));
			}
		}
		save(image, path);
	}
	
	public static void main(String[] args) {
		while (true) {
			String choice = "";
			while (!choice.equals("1") && !choice.equals("2")
				&& !choice.equals("3") && !choice.equals("4")) {
				System.out.print("1. Encode\n2. Decode\n3. Clear\n4. Quit\nChoice: ");
				choice = scanner.nextLine();
			}
			if (choice.equals("4")) {
				System.exit(1);
			} else if (choice.equals("1")) {
				System.out.print("Picture path: ");
				BufferedImage image = readImage(scanner.nextLine());
				System.out.print("File path: ");
				image = encode(image, scanner.nextLine());
				System.out.print("Save path: ");
				save(image, scanner.nextLine());
			} else if (choice.equals("2")) {
				System.out.print("Picture path: ");
				BufferedImage image = readImage(scanner.nextLine());
				System.out.print("Cleartext path: ");
				decode(image, scanner.nextLine());
			} else {
				System.out.print("Picture path: ");
				String path = scanner.nextLine();
				clear(readImage(path), path);
			}
		}
	}
}