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I'm looking for a quick and easy way to do exactly the opposite of split so that it will cause ["a","b","c"] to become "a,b,c"
Iterating through an array requires either adding a condition (if this is not the last element, add the seperator) or using substring to remove the last separator.
I'm sure there is a certified, efficient way to do it (Apache Commons?)
How do you prefer doing it in your projects?
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A class named Demo contains the main function. Here a String object is defined and it is split based on the '_' value upto the last word. A 'for' loop is iterated over and the string is split based on the '_' value. Again, the string is joined using the 'join' function.
In order to combine (concatenate) two arrays, we find its length stored in aLen and bLen respectively. Then, we create a new integer array result with length aLen + bLen . Now, in order to combine both, we copy each element in both arrays to result by using arraycopy() function.
join() The join() method creates and returns a new string by concatenating all of the elements in an array (or an array-like object), separated by commas or a specified separator string.
Using Java 8 you can do this in a very clean way:
String.join(delimiter, elements); This works in three ways:
1) directly specifying the elements
String joined1 = String.join(",", "a", "b", "c"); 2) using arrays
String[] array = new String[] { "a", "b", "c" }; String joined2 = String.join(",", array); 3) using iterables
List<String> list = Arrays.asList(array); String joined3 = String.join(",", list); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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