How to Perform a Deep Copy of a 2D Boolean Array in Java?

Deep Copying a 2D Array in Java

The java.lang.clone() method creates a shallow copy of an array, meaning that it only duplicates the reference to the original array. Modifying the copy will still affect the original array. A deep copy, on the other hand, creates a completely separate instance of the array, with its own set of elements.

Performing a Deep Copy

To perform a deep copy of a boolean[][] array, you can iterate over the array and create a new array for each row:

boolean[][] deepCopy(boolean[][] original) {
    if (original == null) {
        return null;
    }

    boolean[][] result = new boolean[original.length][];
    for (int i = 0; i < original.length; i++) {
        result[i] = Arrays.copyOf(original[i], original[i].length);
    }
    return result;
}

For Java versions prior to Java 6, you can use System.arraycopy as shown below:

boolean[][] deepCopy(boolean[][] original) {
    if (original == null) {
        return null;
    }

    boolean[][] result = new boolean[original.length][];
    for (int i = 0; i < original.length; i++) {
        result[i] = new boolean[original[i].length];
        System.arraycopy(original[i], 0, result[i], 0, original[i].length);
    }
    return result;
}

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