使用 CollectionUtils 中四个方法之一执行集合操作.这四种分别是 union(),intersection();disjunction(); subtract();- import java.util.Arrays;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.List;
- import org.apache.commons.collections.CollectionUtils; import org.apache.commons.lang.ArrayUtils;
- public class CollectionUtilsIntro {
- @SuppressWarnings("unchecked")
- public static void main(String[] args) {
- String[] arrayA = new String[] { "1", "2", "3", "3", "4", "5" };
- String[] arrayB = new String[] { "3", "4", "4", "5", "6", "7" };
- List<String> a = Arrays.asList(arrayA);
- List<String> b = Arrays.asList(arrayB);
- //并集
- Collection<String> union = CollectionUtils.union(a, b);
- //交集
- Collection<String> intersection = CollectionUtils.intersection(a, b);
- //交集的补集
- Collection<String> disjunction = CollectionUtils.disjunction(a, b);
- //集合相减
- Collection<String> subtract = CollectionUtils.subtract(a, b);
- Collections.sort((List<String>) union);
- Collections.sort((List<String>) intersection);
- Collections.sort((List<String>) disjunction);
- Collections.sort((List<String>) subtract);
- System.out.println("A: " + ArrayUtils.toString(a.toArray()));
- System.out.println("B: " + ArrayUtils.toString(b.toArray()));
- System.out.println("--------------------------------------------");
- System.out.println("Union(A, B): " + ArrayUtils.toString(union.toArray()));
- System.out.println("Intersection(A, B): " + ArrayUtils.toString(intersection.toArray()));
- System.out.println("Disjunction(A, B): " + ArrayUtils.toString(disjunction.toArray()));
- System.out.println("Subtract(A, B): " + ArrayUtils.toString(subtract.toArray()));
- }
- }
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