bitsetdemo.java

java2参考大全上的例子的源码和自己的理解.

package bitset;

/**
 Initial pattern in bits1:
 {0, 2, 4, 6, 8, 10, 12, 14}

 Initial pattern in bits2:
 {1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14}

 bits2 AND bits1:
 {2, 4, 6, 8, 12, 14}

 bits2 OR bits1:
 {0, 2, 4, 6, 8, 10, 12, 14}

 bits2 XOR bits1:
 {}
*/

// BitSet Demonstration.
import java.util.BitSet;

class BitSetDemo {
  public static void main(String args[]) {
    BitSet bits1 = new BitSet(16);
    BitSet bits2 = new BitSet(16);

    // set some bits
    for (int i = 0; i < 16; i++) {
      if ( (i % 2) == 0) {
        bits1.set(i);
      }
      if ( (i % 5) != 0) {
        bits2.set(i);
      }
    }

    System.out.println("Initial pattern in bits1: ");
    System.out.println(bits1);
    System.out.println("\nInitial pattern in bits2: ");
    System.out.println(bits2);

    // AND bits
    bits2.and(bits1);
    System.out.println("\nbits2 AND bits1: ");
    System.out.println(bits2);

    // OR bits
    bits2.or(bits1);
    System.out.println("\nbits2 OR bits1: ");
    System.out.println(bits2);

    // XOR bits
    bits2.xor(bits1);
    System.out.println("\nbits2 XOR bits1: ");
    System.out.println(bits2);
  }
}