Is there an equivalent to memcpy() in Java?

You might try System. Arraycopy or make use of array functions in the Arrays class like java.util.Arrays. CopyOf Both should give you native performance under the hood Arrays.

CopyOf is probably favourable for readability, but was only introduced in java 1.6 byte src = {1, 2, 3, 4}; byte dst = Arrays. CopyOf(src, src. Length); System.out.

Println(Arrays. ToString(dst)).

You might try System. Arraycopy or make use of array functions in the Arrays class like java.util.Arrays.copyOf. Both should give you native performance under the hood.Arrays.

CopyOf is probably favourable for readability, but was only introduced in java 1.6. Byte src = {1, 2, 3, 4}; byte dst = Arrays. CopyOf(src, src. Length); System.out.

Println(Arrays. ToString(dst)).

I think the second option is more "logical". I never understood why System.arraycopy() is where is, one of the clumsiest possible locations. – Sinuhe Jul 25 '10 at 13:29 @Sinuhe - it is there for historical reasons.

– Stephen C Jul 25 '10 at 13:46.

Use System.arraycopy() System. Arraycopy(sourceArray, sourceStartIndex, targetArray, targetStartIndex, length); Example, String source = { "alpha", "beta", "gamma" }; String target = new Stringsource. Length; System.

Arraycopy(source, 0, target, 0, source. Length); or use Arrays.copyOf() Example, target = Arrays. CopyOf(source, length); java.util.Arrays.

CopyOf(byte source, int length) was added in JDK 1.6. The copyOf() method uses System.arrayCopy() to make a copy of the array, but is more flexible than clone() since you can make copies of parts of an array.

1 for the examples. – Donal Fellows Jul 25 '10 at 12:41.

You can use System.arrayCopy. It copies elements from a source array to a destination array. The Sun implementation uses hand-optimized assembler, so this is fast.

If you just want an exact copy of a one-dimensional array, use clone(). Byte array = { 0x0A, 0x01 }; byte copy = array.clone(); For other array copy operations, use System. ArrayCopy/Arrays.

CopyOf as Tom suggests. In general, clone should be avoided, but this is an exception to the rule.

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