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Bookmark or Share- How can I concatenate two arrays in Java? - Stack OverflowYou can append the two arrays in two lines of code. String[] both = Arrays.copyOf(first, first.length + second.length); System.arraycopy(second, 0, both, first.length, second.length); This is a fast and efficient solution and will work for primitive types as well as the two methods involved are overloaded.
- Converting array to list in Java - Stack OverflowWhen we use Arrays.asList the size of the returned list is fixed because the list returned is not java.util.ArrayList, but a private static class defined inside java.util.Arrays. So if we add or remove elements from the returned list, an UnsupportedOperationException will be thrown.
- How to merge two arrays in JavaScript and de-duplicate itemsHere is a slightly different take on the loop. With some of the optimizations in the latest version of Chrome, it is the fastest method for resolving the union of the two arrays (Chrome 38.0.2111).
- What's the simplest way to print a Java array? - Stack OverflowSince Java 5 you can use Arrays.toString(arr) or Arrays.deepToString(arr) for arrays within arrays. Note that the Object[] version calls .toString() on each object in the array. The output is even decorated in the exact way you're asking. Examples: Simple Array:
- How to make an array of arrays in Java - Stack OverflowArrays are cumbersome, in most cases you are better off using the Collection API. With Collections, you can add and remove elements and there are specialized Collections for different functionality (index-based lookup, sorting, uniqueness, FIFO-access, concurrency etc.).
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