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diff --git a/projects/project2_LInfiniteInteger/InfiniteIntegerInterface.java b/projects/project2_LInfiniteInteger/InfiniteIntegerInterface.java
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+
+public interface InfiniteIntegerInterface
+{
+	/**
+	 * Gets the number of digits of this infinite integer.
+	 * @return an integer representing the number of digits
+	 * of this infinite integer.
+	 */
+	public int getNumberOfDigits();
+	
+	/**
+	 * Checks whether this infinite integer is a negative number.
+	 * @return true if this infinite integer is a negative number.
+	 * Otherwise, return false.
+	 */
+	public boolean isNegative();
+	
+	/**
+	 * Calculates the result of this infinite integer plus anInfiniteInteger
+	 * @param anInfiniteInteger the infinite integer to be added.
+	 * @return a NEW infinite integer representing the result of this
+	 * infinite integer plus anInfiniteInteger
+	 */
+	public InfiniteIntegerInterface plus(final InfiniteIntegerInterface anInfiniteInteger);
+	
+	/**
+	 * Calculates the result of this infinite integer subtracted by anInfiniteInteger
+	 * @param anInfiniteInteger the infinite integer to subtract.
+	 * @return a NEW infinite integer representing the result of this
+	 * infinite integer subtracted by anInfiniteInteger
+	 */
+	public InfiniteIntegerInterface minus(final InfiniteIntegerInterface anInfiniteInteger);
+	
+	/**
+	 * Calculates the result of this infinite integer multiplied by anInfiniteInteger
+	 * @param anInfiniteInteger the multiplier.
+	 * @return a NEW infinite integer representing the result of this
+	 * infinite integer multiplied by anInfiniteInteger.
+	 */	
+	public InfiniteIntegerInterface multiply(final InfiniteIntegerInterface anInfiniteInteger);
+	
+	/**
+	 * Generates a string representing this infinite integer. If this infinite integer
+	 * is a negative number a minus symbol should be in the front of numbers. For example,
+	 * "-12345678901234567890". But if the infinite integer is a positive number, no symbol
+	 * should be in the front of the numbers (e.g., "12345678901234567890").
+	 * @return a string representing this infinite integer number.
+	 */
+	public String toString();
+
+	/**
+	 * Compares this infinite integer with anInfiniteInteger
+	 * @return either -1, 0, or 1 as follows:
+	 * If this infinite integer is less than anInfiniteInteger, return -1.
+	 * If this infinite integer is equal to anInfiniteInteger, return 0.
+	 * If this infinite integer is greater than anInfiniteInteger, return 1.
+	 */
+	public int compareTo(final InfiniteIntegerInterface anInfiniteInteger);
+}