我想在Java中進(jìn)行聯(lián)合，相交，差異和反向操作。首先我有2個實(shí)例 ArrayList<Integer>a = [0,2,4,5,6,8,10]b = [5,6,7,8,9,10]聯(lián)盟b應(yīng)該返回 c = [0,2,3,4,5,6,7,8,9,10]a相交b應(yīng)該返回 c = [5,8,10]a偏差b應(yīng)該返回 c = [0,2,3,4]相反 a = [10,8,6,5,4,2,0]這樣的事情。如何在Java中實(shí)現(xiàn)該方法？更新：我必須從以下模板開始：package IntSet;import java.util.ArrayList;import java.util.Collection;public class IntSet {private ArrayList<Integer> intset;public IntSet(){    intset = new ArrayList<Integer>();}public void insert(int x){    intset.add(x);}public void remove(int x){    //implement here    intset.indexOf(x);}public boolean member(int x){    //implement here    return true;}public IntSet intersect(IntSet a){    //implement here    return a;}public IntSet union(IntSet a){    //implement here    return a;}public IntSet difference(IntSet a){    //implement here    IntSet b = new IntSet();    return b; }