@Test public void aaa(){ String[] sbNo = new String[]{"asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd","asd"}; int r = -1; for (int i = 0; i < 100; i++) { //1 多线程环境 //r = ThreadLocalRandom.current().nextInt(sbNo.length) % sbNo.length; //2 普通的 Random random = new Random(); r = random.nextInt(sbNo.length); System.out.println(r); } }
JAVA随机获取集合里的元素
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