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public static void main(String[] args) {
List<String> strList = Arrays.asList(new String[] { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12" });
Collections.shuffle(strList);
String[] strs1 = new String[strList.size() / 2], strs2 = new String[strList.size() / 2];
for (int i = 0; i < strs1.length; i++) {
strs1[i] = strList.get(i);
strs2[i] = strList.get(i + strs1.length);
}
}