用java中vector类，用递归方法求解幂集

好的，这个问题可以回答。以下是使用递归方法求解幂集的Java代码示例：

import java.util.Vector;

public class PowerSet {

    public static Vector<Vector<Integer>> getPowerSet(Vector<Integer> v) {
        Vector<Vector<Integer>> powerSet = new Vector<Vector<Integer>>();
        powerSet.add(new Vector<Integer>());
        
        for (int i = 0; i < v.size(); i++) {
            Vector<Vector<Integer>> newPowerSet = new Vector<Vector<Integer>>();
            
            for (Vector<Integer> subset : powerSet) {
                newPowerSet.add(subset);
                
                Vector<Integer> newSubset = new Vector<Integer>(subset);
                newSubset.add(v.get(i));
                newPowerSet.add(newSubset);
            }
            
            powerSet = newPowerSet;
        }
        
        return powerSet;
    }

    public static void main(String[] args) {
        Vector<Integer> v = new Vector<Integer>();
        v.add(1);
        v.add(2);
        v.add(3);

        Vector<Vector<Integer>> powerSet = getPowerSet(v);

        System.out.println("Power set of " + v + ": ");
        for (Vector<Integer> subset : powerSet) {
            System.out.println(subset);
        }
    }
}