How to combine a String of arrays to one string using loops? [duplicate]

by 

public static void main(String[] args) {

    String [] x = {"ab", "bc", "cd"};

    String z = concatination(x);

    System.out.println(z);
}

public static String concatination(String[] array) {
    String concat = "";
    for(int j = 0; j<array.length; j++) {
        concat += array[j];
    }
    return concat;
}

OUTPUT:
abbccd

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