List<String> list = Arrays.asList("a","b","c"); // 随机从0和List长度中获取索引 int index = (int) (Math.random()* list.size()); System.out.println(list.get(index)); }
Collections打乱顺序
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publicstaticvoidmain(String[] args){
List<String> list = Arrays.asList("a","b","c"); // shuffle 打乱顺序 Collections.shuffle(list); System.out.println(list.get(0)); }