How to concatenate strings from a 3-in-3 vector in Java?

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I need to concatenate the elements of a 3-in-3 vector.

Follow the sample of what I need: 

package ex;

public class prog {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String[] vetor = {"aaa", "aaa", "aaa", "bbb", "bbb", "bbb", "ccc", "ccc", "ccc", "ddd", "ddd", "ddd"};

String[] novo_vetor; // vetor que terá as strings "aaaaaaaaa", "bbbbbbbbb", "ccccccccc", "ddddddddd");
    }

}
java array

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1 answer

3

You can do it like this:

class HelloWorld {
    public static void main(String[] args) {
        String[] vetor = {"aaa", "aaa", "aaa", "bbb", "bbb", "bbb", "ccc", "ccc", "ccc", "ddd", "ddd", "ddd"};
        String[] novoVetor = new String[vetor.length / 3];
        for (int i = 0; i < vetor.length; i += 3) novoVetor[i / 3] = vetor[i] + vetor[i + 1] + vetor[i + 2];
        for (String item : novoVetor) System.out.println(item);
    }
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

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