Java BitSet isEmpty() Method

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Description

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

Declaration

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

public boolean isEmpty()

Parameters

NA

Return Value

This method returns boolean indicating whether this BitSet is empty.

Exception

NA

Checking a BitSet to be Empty or Not Example

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());
   }
}

Output

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

Checking a BitSet of Bytes to be Empty or Not Example

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());
   }
}

Output

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

Checking a BitSet of Longs to be Empty or Not Example

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());
   }
}

Output

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