Examples of java.util.BitSet.flip()

java.util.BitSet.flip()
Sets the bit at the specified index to the complement of its current value. @param bitIndex the index of the bit to flip. @exception IndexOutOfBoundsException if the specified index is negative. @since 1.4

  public void testbitsetlogic() throws Exception {
    final BitSet setallfalse = new BitSet(7);
    final BitSet invert = (BitSet) setallfalse.clone();
    assertThat(invert.length(), is(0));


    invert.flip(0, 6);
    assertThat(invert.length(), is(6));
    final BitSet set = new BitSet();
    set.set(3);
    set.set(4);
    set.set(5);

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          b.fastSet(idx);
          idx = rand.nextInt(sz);
          a.clear(idx);
          b.fastClear(idx);
          idx = rand.nextInt(sz);
          a.flip(idx);
          b.fastFlip(idx);


          boolean val = b.flipAndGet(idx);
          boolean val2 = b.flipAndGet(idx);
          assertTrue(val != val2);

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      // test ranges, including possible extension
      int fromIndex, toIndex;
      fromIndex = rand.nextInt(sz+80);
      toIndex = fromIndex + rand.nextInt((sz>>1)+1);
      BitSet aa = (BitSet)a.clone(); aa.flip(fromIndex,toIndex);
      OpenBitSet bb = (OpenBitSet)b.clone(); bb.flip(fromIndex,toIndex);


      doIterate(aa,bb, mode);   // a problem here is from flip or doIterate


      fromIndex = rand.nextInt(sz+80);

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    byte[] expectedByteArray = new byte[1];
    byte[] outputArray = new byte[1];
    BitSet methodBitSet = new BitSet(8);


    /* 0x01 */
    methodBitSet.flip(0);
    expectedByteArray[0] = (byte)1;
    /* 0x01 & 0x00 == 0x01 */
    outputArray = HexUtil.bitsToBytes(methodBitSet,0);
    assertFalse(Arrays.equals(expectedByteArray,outputArray));
    /* 0x01 & 0x01 == 0x01 */

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    /* 0x01 & 0x01 == 0x01 */
    outputArray = HexUtil.bitsToBytes(methodBitSet,1);
    assertTrue(Arrays.equals(expectedByteArray,outputArray));
    
    /* 0x80 */
    methodBitSet.flip(7);
    /* 0x08 */
    methodBitSet.flip(3);
    expectedByteArray[0] = (byte)128+8+1;
    /* 0x89 & 0x08 == 0x89 */
    outputArray = HexUtil.bitsToBytes(methodBitSet,3);

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    assertTrue(Arrays.equals(expectedByteArray,outputArray));
    
    /* 0x80 */
    methodBitSet.flip(7);
    /* 0x08 */
    methodBitSet.flip(3);
    expectedByteArray[0] = (byte)128+8+1;
    /* 0x89 & 0x08 == 0x89 */
    outputArray = HexUtil.bitsToBytes(methodBitSet,3);
    assertFalse(Arrays.equals(expectedByteArray,outputArray));
    /* 0x89 & 0xff == 0x89 */

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          b.fastSet(idx);
          idx = random.nextInt(sz);
          a.clear(idx);
          b.fastClear(idx);
          idx = random.nextInt(sz);
          a.flip(idx);
          b.fastFlip(idx);


          boolean val = b.flipAndGet(idx);
          boolean val2 = b.flipAndGet(idx);
          assertTrue(val != val2);

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      // test ranges, including possible extension
      int fromIndex, toIndex;
      fromIndex = random.nextInt(sz+80);
      toIndex = fromIndex + random.nextInt((sz>>1)+1);
      BitSet aa = (BitSet)a.clone(); aa.flip(fromIndex,toIndex);
      OpenBitSet bb = (OpenBitSet)b.clone(); bb.flip(fromIndex,toIndex);


      doIterate(aa,bb, mode);   // a problem here is from flip or doIterate


      fromIndex = random.nextInt(sz+80);

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          idx = random().nextInt(sz);
          a.clear(idx);
          b.clear(idx);
          
          idx = random().nextInt(sz);
          a.flip(idx);
          b.flip(idx, idx+1);


          idx = random().nextInt(sz);
          a.flip(idx);
          b.flip(idx, idx+1);

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          idx = random().nextInt(sz);
          a.flip(idx);
          b.flip(idx, idx+1);


          idx = random().nextInt(sz);
          a.flip(idx);
          b.flip(idx, idx+1);


          boolean val2 = b.get(idx);
          boolean val = b.getAndSet(idx);
          assertTrue(val2 == val);

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