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Collections |

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# 用于操作 Set,List,Map 的静态工具类

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Collections-静态字段/方法|

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boolean addAll(Collection<? super T> c, T... elements)

* 把变长数据都存入c

void shuffle(List<?> list);

* 随机打乱集合数据

void shuffle(List<?> list, Random rnd)

* 同上,指定的 Random