求助 两个 数组 差集 ,或交集

[wtydoone]

求助 两个 数组 差集 ,或交集
arrayA={01,02,03,04,05,06}
arrayB={02,03,09,10,11,12,14,15}
通过比较要得到他们差集.

[巴巴爸爸巴巴爸爸]

用equals遍历比较两个数组
双重循环把相同的找出来就是交集
删除本数组中任何存在于另一数组中元素剩下的就是差集

[zapdos]

转为Set
遍历a，看b里面是否包含，包含就删，不包含就添到b里面

[toshiba_java]

import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
public class TestArrUnite
{
	private  Integer[]  arr1 ={1,2,3};
	private  Integer[]  arr2 ={2,3,4};
	public static void main(String[] args)
	{
		TestArrUnite test = new TestArrUnite();
		Integer UniteArr [] = test.uniteArr();
		Arrays.sort(UniteArr);
		for(int i:UniteArr){
			System.out.print(i+ " ");

		}
		System.out.println();
		Integer ChaArr [] = test.chaArr();
		Arrays.sort(ChaArr);
		for(int i:ChaArr){
			System.out.print(i+ " ");
		}
	}
	public Integer[] uniteArr(){
		List arrL1= Arrays.asList(arr1);
		List arrL2= Arrays.asList(arr2);
		
		Set hst = new HashSet(arrL1);
		hst.addAll(arrL2);

		return (Integer [])hst.toArray(new Integer [0]);
	}
	public Integer[] chaArr(){
		List arrL1= Arrays.asList(arr1);
		Set hst = new HashSet(arrL1);
		for(Integer i:arr2){
			if(!hst.add(i)){
				hst.remove(i);
			}
		}
		return (Integer []) hst.toArray(new Integer[0]);
	}
}

[yes152]

import java.util.*;
public class Sets {
    /**交集*/
    public static Set<String> intersection(Set<String> setA, Set<String> setB) {
        Set<String> setIntersection = new HashSet<String>();
        String s = "";
        Iterator<String> iterA = setA.iterator();
        while (iterA.hasNext()) {
            s = iterA.next();
            if(setB.contains(s)) {
                setIntersection.add(s);
            }
        }
        return setIntersection;
    }
    /**差集*/
    public static Set<String> difference(Set<String> setA, Set<String> setB) {
        Set<String> setDifference = new HashSet<String>();
        String s = "";
        Iterator<String> iterA = setA.iterator();
        while (iterA.hasNext()) {
            s = iterA.next();
            if(!setB.contains(s)) {
                setDifference.add(s);
            }
        }
        return setDifference;
    }
    
    public static void main(String[] args) {
        String[] strA = {"green", "blue", "red", "pink", "yellow"},
                 strB = {"red", "green"}; 
        Set<String> setA = new HashSet<String>(),
                    setB = new HashSet<String>(),
                    setC = null;
        
        /**将数组元素加到集合*/
        for (int i = 0; i < strA.length; i++) {
            setA.add(strA[i]);
        }
        for (int i = 0; i < strB.length; i++) {
            setB.add(strB[i]);
        }
        
        /**求交集结果*/
        setC = intersection(setA, setB);
        System.out.println("交集: " + setC);
        /**求差集结果*/
        setC = difference(setA, setB);
        System.out.println("差集: " + setC);
        
    }
}