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

Creating Deep Copies of 2D Boolean Arrays in Java

Problem:

Avoid using .clone() when manipulating 2D boolean arrays, as it creates shallow copies instead of deep copies.

Question:

How to perform a deep copy of a 2D boolean array in Java?

Answer:

Iterate over the original array to create a new array with independent elements.

Java 6 Solution:

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

Pre Java 6 Solution:

// For Java versions prior to Java 6
public static boolean[][] deepCopy(boolean[][] original) {
    if (original == null) {
        return null;
    }
    
    final 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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