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Java code:
Set<Integer> set = new HashSet<Integer>();
Random rdm = new Random();
//ÐèÒªÉú³É¼¸¸öÊý£¬¾ÍÉèÖü¸£¬ÕâÀïÉú³É5¸ö
while (set.size() < 5) {
set.add(rdm.nextInt());
}
System.out.println(set);
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