1.org.apache.commons.collections.CollectionUtils;使用这个工具类，帮我们处理一些集合的操作，非常方便//取并集publicvoidtestUnion(){String[]arrayA=newString[]{"A","B","C","D","E","F"};String[...

publicclassCollectionUtils{/***数组是否包含元素*@paramarr*@paramstr*@return*/publicstaticbooleanisArrayContains(String[]arr,Stringstr){if(arr==null||arr.length==0){retu...