设计位集

import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.List;

/**
 * @author yagol
 * @date 上午10:55
 * @desc the description of this class
 **/
class Bitset {
    public static void main(String[] args) {
        Bitset bitset = new Bitset(45);
        System.out.println(bitset.all());
        bitset.flip();
        System.out.println(bitset.count());
        System.out.println(bitset.all());
        System.out.println(bitset.one());
        System.out.println(bitset);
    }

    int[] data;
    int count;
    boolean reverse = false;

    public Bitset(int size) {
        data = new int[size];
        count = 0;
    }

    public void fix(int idx) {
        if (reverse == false) {
            if (data[idx] == 0) {
                data[idx] = 1;
                count++;
            }
        } else {
            if (data[idx] == 1) {
                data[idx] = 0;
                count--;
            }
        }

    }

    public void unfix(int idx) {
        if (reverse == false) {
            if (data[idx] == 1) {
                data[idx] = 0;
                count--;
            }
        } else {
            if (data[idx] == 0) {
                data[idx] = 1;
                count++;
            }
        }

    }

    public void flip() {
        reverse = !reverse;
    }

    public boolean all() {
        if (!reverse) {
            return count == data.length;
        } else {
            return count == 0;
        }

    }

    public boolean one() {
        if (!reverse) {
            return count != 0;
        } else {
            return data.length - count > 0;
        }

    }

    public int count() {
        if (!reverse) {
            return count;
        } else {
            return data.length - count;
        }

    }

    @Override
    public String toString() {
        StringBuilder res = new StringBuilder();
        if (!reverse) {
            for (int datum : data) {
                res.append(datum);
            }
        } else {
            for (int datum : data) {
                if (datum == 1) {
                    res.append("0");
                } else {
                    res.append("1");
                }
            }
        }
        return res.toString();
    }
}
//[null,null,null,null,false,null,null,true,null,2,"01010"]