java - 如何克隆 java 字节数组？

Question

我有一个字节数组，我想复制/克隆它以避免调用代码修改我的内部表示。

如何克隆 java 字节数组？

Answer 1

JLS 6.4.5 The Members of an Array Type

The members of an array type are all of the following:

• The public final field length, which contains the number of components of the array (length may be positive or zero).
• The public method clone, which overrides the method of the same name in class Object and throws no checked exceptions. The return type of the clone method of an array type T[] is T[].
• All the members inherited from class Object; the only method of Object that is not inherited is its clone method.

因此:

byte[] original = ...;
byte[] copy = original.clone();

请注意，对于引用类型数组，clone() 本质上是一个 shallow copy .

另外，Java 没有多维数组；它有数组数组。因此，一个byte[][]是一个Object[]，也是浅拷贝。

另见

• Wikipedia/Object copy
• Java Nuts and Bolts/Arrays

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其他选项

注意 clone() 返回一个 new 数组对象。如果您只是想将一个数组中的值复制到一个已经存在的数组中，您可以使用例如System.arraycopy (jdk 1.0+)。

还有java.util.Arrays .copyOf (jdk 1.6+)，允许您创建具有不同长度(截断或填充)的副本。

相关问题

• Difference between various Array copy methods