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javaarraysone-liner

How to join Array to String (Java) in one line?

Let's assume there is an array:

String[] myArray = new String[]{"slim cat", "fat cat", "extremely fat cat"};

Now I want to transform this array into a String joined with "&". So that the output becomes:

slim cat&fat cat&extremely fat cat

I am trying to keep my code shorter and clean, without the need to manually type a for loop.

I would like to have a short solution, like we use in reverse way with someString.split();.

How can I achieve this?

Solution

  • Using Java 8, String.join(CharSequence delimiter, CharSequence... elements):

    String result = String.join("&", myArray);

    Using Java 7 or earlier, you either need a loop or recursion.