如何在 Java 中对二维数组进行深拷贝? [英] How do I do a deep copy of a 2d array in Java?

问题描述

我刚刚在我的 2d boolean 数组上使用了 .clone()，认为这是一个深拷贝.

I just got bit by using .clone() on my 2d boolean array, thinking that this was a deep copy.

如何对我的 boolean[][] 数组执行深层复制?

How can I perform a deep copy of my boolean[][] array?

我应该遍历它并执行一系列 System.arraycopy 吗?

Should I loop through it and do a series of System.arraycopy's?

推荐答案

是的，您应该遍历 2D 布尔数组以对其进行深度复制.如果您使用的是 Java 6，还可以查看 java.util.Arrays#copyOf 方法.

Yes, you should iterate over 2D boolean array in order to deep copy it. Also look at java.util.Arrays#copyOf methods if you are on Java 6.

我建议使用 Java 6 的下一个代码:

I would suggest the next code for 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] = Arrays.copyOf(original[i], original[i].length);
        // For Java versions prior to Java 6 use the next:
        // System.arraycopy(original[i], 0, result[i], 0, original[i].length);
    }
    return result;
}

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