java容器取交集、并集、补集、差集示例

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;


/**
 * 类说明: 获取集合的并集、交集、交集的补集、差集
 * Time: 2013-7-29 下午5:10:31 
 * @author 加内特
 * Company: www.china.com.cn
 */

public class Test {
	public static void main(String[] args) {
		String[] arrayA = new String[] { "a", "b", "c" };
		String[] arrayB = new String[] { "a", "b", "d" };
		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("并集    Union(A, B): " + ArrayUtils.toString(union.toArray()));
		System.out.println("交集 Intersection(A, B): " + ArrayUtils.toString(intersection.toArray()));
		System.out.println("交集的补集      Disjunction(A, B): " + ArrayUtils.toString(disjunction.toArray()));
		System.out.println("集合相减 Subtract(A, B): " + ArrayUtils.toString(subtract.toArray()));
	}
}