String[] attributes = new String[attributeNumber];
for (int i = 0; i < attributeNumber; i++) {
    attributes[i] = randomString(1,10);
    System.out.println("generated:"+attributes[i]);
}
for (String attribute : attributes) {
    System.out.println(attribute);
}

outputs:
generated:qmWt XMO
generated:XhSYSsPP
generated:dxjaNEIih
qmWt XMO
XhSYSsPP
dxjaNEIih

------------------------------------------
for (String attribute : attributes) {
    attribute = randomString(1,10);
    System.out.println("generated:"+attribute);
}
for (String attribute : attributes) {
    System.out.println(attribute);
}

outputs:
generated:tTsu
generated:PT
generated:hBnol
null
null
null