Java BitSet示例 [英] Java BitSet Example

问题描述

我正在寻找一个好的Java BitSet 示例来处理0和1。我试着查看Javadocs，但是我只是通过阅读来了解该类的用法。例如，和，或和 xor 方法适用于两个不同的 BitSet 对象？

I'm looking for a good Java BitSet example to work with 0 and 1s. I tried looking at the Javadocs but I don't understand the usage of the class by just reading that. For instance, how would the and, or, and xor methods work on two different BitSet objects?

例如：

  BitSet bits1 = new BitSet();
  BitSet bits2 = new BitSet();

  bits2.set(1000001);
  bits1.set(1111111);

  bits2.and(bits1);

  System.out.println(bits2);

如果我这样做，它会返回 bits2 as为什么会这样？

If I do this it returns bits2 as empty why is that?

推荐答案

对于您提到的具体问题：当您调用 bits2.set（ 1000001），您将百万分之一和第一位设置为true。然后当你与 bits1 相交时，它们设置了一百万，一亿一千一百一十一和第一百一十二位，它们没有共同点。

For the specific problem you mentioned: when you called bits2.set(1000001), you set the one millionth and first bit to true. Then when you intersected with bits1, which had the one million, 111 thousand, and 111st bit set, they had no bits in common.

我认为你的意思

I think what you meant to do was

 bits2.set(0); // set the 0th bit
 bits2.set(6); // set the 6th bit

这有助于解决问题吗？

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