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Showing content from https://www.tutorialspoint.com/java/util/bitset_isempty.htm below:

Java BitSet isEmpty() Method

The Java BitSet isEmpty() method returns true if this BitSet contains no bits that are set to true.

Following is the declaration for java.util.BitSet.isEmpty() method

public boolean isEmpty()

NA

This method returns boolean indicating whether this BitSet is empty.

NA

The following example shows the usage of Java BitSet isEmpty() method. We're creating two BitSets. We're setting true values in a BitSet object using set() method call and using isEmpty() method we're checking if bitset is empty or not.

package com.tutorialspoint;

import java.util.BitSet;

public class BitSetDemo {
   public static void main(String[] args) {

      // create 2 bitsets
      BitSet bitset1 = new BitSet();
      BitSet bitset2 = new BitSet();

      // assign values to bitset1
      bitset1.set(0, 6, true);
	  
      // print the sets
      System.out.println("Bitset1:" + bitset1);
      System.out.println("Bitset2:" + bitset2);

      // print the empty status of bitsets
      System.out.println("Bitset1 is empty :" + bitset1.isEmpty());
      System.out.println("Bitset2 is empty :" + bitset2.isEmpty());
   }
}

Let us compile and run the above program, this will produce the following result −

Bitset1:{0, 1, 2, 3, 4, 5}
Bitset2:{}
Bitset1 is empty :false
Bitset2 is empty :true

The following example shows the usage of Java BitSet isEmpty() method. We're creating two BitSets using byte[] and using isEmpty() method we're checking if bitset is empty or not.

package com.tutorialspoint;

import java.util.BitSet;

public class BitSetDemo {
   public static void main(String[] args) {

      // create 2 bitsets
      BitSet bitset1 = BitSet.valueOf(new byte[] { 0, 1, 2, 3, 4, 5 });
      BitSet bitset2 = new BitSet();

      // print the sets
      System.out.println("Bitset1:" + bitset1);
      System.out.println("Bitset2:" + bitset2);
      
      // print the empty status of bitsets
      System.out.println("Bitset1 is empty :" + bitset1.isEmpty());
      System.out.println("Bitset2 is empty :" + bitset2.isEmpty());
   }
}

Let us compile and run the above program, this will produce the following result −

Bitset1:{8, 17, 24, 25, 34, 40, 42}
Bitset2:{}
Bitset1 is empty :false
Bitset2 is empty :true

The following example shows the usage of Java BitSet isEmpty() method. We're creating two BitSets using long[] and using isEmpty() method we're checking if bitset is empty or not.

package com.tutorialspoint;

import java.util.BitSet;

public class BitSetDemo {
   public static void main(String[] args) {

      // create 2 bitsets
      BitSet bitset1 = BitSet.valueOf(new long[] { 0, 1, 2, 3, 4, 5 });
      BitSet bitset2 = new BitSet();

      // print the sets
      System.out.println("Bitset1:" + bitset1);
      System.out.println("Bitset2:" + bitset2);

      // print the empty status of bitsets
      System.out.println("Bitset1 is empty :" + bitset1.isEmpty());
      System.out.println("Bitset2 is empty :" + bitset2.isEmpty());
   }
}

Let us compile and run the above program, this will produce the following result −

Bitset1:{64, 129, 192, 193, 258, 320, 322}
Bitset2:{}
Bitset1 is empty :false
Bitset2 is empty :true

java_util_bitset.htm

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