Code implementation

src/.gitignore

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+/bin/
+.classpath

src/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>src</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

src/src/biDirectionalCodeConverter/BinaryToGrey.java

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+package biDirectionalCodeConverter;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class BinaryToGrey {
+
+	public static int toGrey(int decimal) {
+
+		int i = 0;
+		int greyInteger = 0;
+		int binary = DecimalToBinary.toBinary(decimal);
+
+		ArrayList<Integer> binaryArrayList = new ArrayList<>();
+		ArrayList<Integer> greyArrayList = new ArrayList<>();
+
+		while (binary > 0) {
+			binaryArrayList.add(i++, binary % 10);
+			binary /= 10;
+		}
+
+		Collections.reverse(binaryArrayList);
+
+		for (int j = 0; j < binaryArrayList.size(); j++) {
+			if (j == 0) {
+				greyArrayList.add(j, binaryArrayList.get(j));
+			} else {
+				greyArrayList.add(j, (binaryArrayList.get(j - 1) ^ binaryArrayList.get(j)));
+			}
+		}
+
+		for (int j = 0; j < greyArrayList.size(); j++) {
+			greyInteger = greyArrayList.get(j) + greyInteger * 10;
+		}
+		return greyInteger;
+	}
+}

src/src/biDirectionalCodeConverter/DecimalToBinary.java

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+package biDirectionalCodeConverter;
+
+import java.util.ArrayList;
+
+public class DecimalToBinary {
+
+	public static int toBinary(int decimal) {
+
+		int i = 0;
+		int binaryInteger = 0;
+		ArrayList<Integer> binary = new ArrayList<>();
+		while (decimal > 0) {
+			binary.add(i++, decimal % 2);
+			decimal /= 2;
+		}
+
+		for (int j = binary.size() - 1; j >= 0; j--) {
+			binaryInteger = binary.get(j) + binaryInteger * 10;
+		}
+		return binaryInteger;
+	}
+}

src/src/biDirectionalCodeConverter/Main.java

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+package biDirectionalCodeConverter;
+
+public class Main {
+	public static void main(String args[]) {
+
+		for (int i = 0; i < 16; i++) {
+			int binary = DecimalToBinary.toBinary(i);
+			int grey = BinaryToGrey.toGrey(i);
+
+			System.out.print("The binary code of the decimal number " + i + " is ");
+			System.out.println(String.format("%04d", binary).substring(0));
+			System.out.print("The grey code of the decimal number " + i + " is ");
+			System.out.println(String.format("%04d", grey).substring(0));
+		}
+	}
+}