#1、maven包依赖
org.apache.commons
commons-collections4
4.1
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#2、具体代码
public class demo {
//两个集合也可以是对象集合
public static void main(String[] args) {
List list1 = new ArrayList();
List list2 = new ArrayList();
String String1 = new String("1");
String String2 = new String("2");
String String3 = new String("1");
String String4 = new String("4");
list1.add(String1);
list1.add(String2);
list2.add(String3);
list2.add(String4);
List union = getUnion(list1,list2);
System.out.println("并集:"+union);
List intersection = getIntersection(list1,list2);
System.out.println("交集:"+intersection);
List disjunction = getDisjunction(list1,list2);
System.out.println("交集的补集:"+disjunction);
List subtract = getSubtract(union,list1);
System.out.println("差集:"+subtract);
}
//获取两个集合并集(自动去重)
public static List getUnion(List list1, List list2){
List union = (List) CollectionUtils.union(list1, list2);
return union;
}
//获取两个集合交集
public static List getIntersection(List list1,List list2){
List intersection = (List)CollectionUtils.intersection(list1, list2);
return intersection;
}
//获取两个集合交集的补集 即 list1 + list2 - 交集
public static List getDisjunction(List list1,List list2){
List disjunction = (List)CollectionUtils.disjunction(list1, list2);
return disjunction;
}
//获取两个集合的差集 list1 - 交集
public static List getSubtract(List list1,List list2){
List subtract = (List)CollectionUtils.subtract(list1, list2);
return subtract;
}
}
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运行结果:
![image.png](https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/13a7e8fc7ab54cee9f427f834ee1f248~tplv-k3u1fbpfcp-zoom-in-crop-mark:3024:0:0:0.image)
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