How to perform bit operations using BitSet function in Java

BitSet is a class in Java used for bit operations. BitSet can be thought of as an array composed of binary bits, and each binary bit can only be 0 or 1. BitSet provides a series of methods to perform bit operations, including setting, clearing, flipping, getting, etc.

It is very simple to use BitSet to perform bit operations in Java. Let’s introduce the specific operation steps.

1. Create a BitSet object

BitSet objects can be created in two ways:

1. Create a BitSet object using default values

BitSet bitSet = new BitSet();

Above The code creates an empty BitSet object with all binary bits set to 0.

2. Create a BitSet object with the specified length

BitSet bitSet = new BitSet(100);

The above code creates a BitSet object with a length of 100, and all binary bits are set to 0.

2. Set the binary bit

You can use the set() method to set the specified binary bit to 1, for example:

bitSet.set(5);

The above code sets the 6th binary bit to 1 1.

You can also use the set() method to set a section of binary bits to 1, for example:

bitSet.set(10, 20);

The above code sets the 11th to 20th binary bits to 1.

You can use the set() method to set multiple binary bits to 1, for example:

bitSet.set(1);
bitSet.set(3);
bitSet.set(6);

The above code sets the 2nd, 4th, and 7th binary bits to 1.

3. Clear the binary bit

You can use the clear() method to clear the specified binary bit, for example:

bitSet.clear(5);

The above code clears the 6th binary bit. .

You can also use the clear() method to clear a section of binary bits, for example:

bitSet.clear(10, 20);

The above code clears the 11th to 20th binary bits.

You can use the clear() method to clear multiple binary bits, for example:

bitSet.clear(1);
bitSet.clear(3);
bitSet.clear(6);

The above code clears the 2nd, 4th, and 7th binary bits.

4. Flip the binary digit

You can use the flip() method to flip the specified binary digit, for example:

bitSet.flip(5);

The above code flips the 6th binary digit, that is, the original It was 0 that turned into 1, and it turned out to be 1 that turned into 0.

You can also use the flip() method to flip a section of binary digits, for example:

bitSet.flip(10, 20);

The above code flips the 11th to 20th binary digits.

You can use the flip() method to flip multiple binary digits, for example:

bitSet.flip(1);
bitSet.flip(3);
bitSet.flip(6);

The above code flips the 2nd, 4th, and 7th binary digits.

5. Obtain the binary digit

You can use the get() method to obtain the value of the specified binary digit, for example:

boolean value = bitSet.get(5);

The above code obtains the value of the 6th binary digit , if the bit is 1, the value is true, otherwise the value is false.

You can also use the get() method to obtain the value of a segment of binary digits, for example:

BitSet subBitSet = bitSet.get(10, 20);

The above code obtains the value of the 11th to 20th binary digits and stores them in subBitSet in the object.

You can use the get() method to obtain the values ​​of multiple binary digits, for example:

boolean value1 = bitSet.get(1);
boolean value2 = bitSet.get(3);
boolean value3 = bitSet.get(6);

The above code obtains the values ​​of the 2nd, 4th, and 7th binary digits respectively.

6. Other operations

In addition to the above operations, BitSet also provides some other methods for bit operations, such as:

• and(BitSet set): ANDed with another BitSet object.
• or(BitSet set): OR operation with another BitSet object.
• xor(BitSet set): Perform XOR operation with another BitSet object.
• size(): Get the length of the BitSet object.
• length(): Get the highest-order subscript of the BitSet object.

7. Summary

It is very convenient to use the BitSet function in Java to perform bit operations. Most of the bit operations can be completed with only a few lines of code. When you need to write programs related to bit operations, it is recommended to use BitSet to complete it.

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