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Java - Integer bitCount() method
Description
The Java Integer bitCount() method returns the number of one-bits in the two's complement binary representation of the specified int value i. This is sometimes referred to as the population count.
Declaration
Following is the declaration for java.lang.Integer.bitCount() method
public static int bitCount(int i)
Parameters
i − This is the int value.
Return Value
This method returns the number of one-bits in the two's complement binary representation of the specified int value.
Exception
NA
Example 1
The following example shows the usage of Integer bitCount() method to get a number of one bits of an integer. We've created a int variable and assigned it a positive value. Then using toBinaryString() method, we're printing the binary representation and bit count using bitCount() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = 177; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bits System.out.println("Number of one bits = " + Integer.bitCount(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 177 Binary = 10110001 Number of one bits = 4
Example 2
The following example shows the usage of Integer bitCount() method to get a number of one bits of an integer. We've created a int variable and assigned it a negative value. Then using toBinaryString() method, we're printing the binary representation and bit count using bitCount() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = -177; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bits System.out.println("Number of one bits = " + Integer.bitCount(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = -177 Binary = 11111111111111111111111101001111 Number of one bits = 29
Example 3
The following example shows the usage of Integer bitCount() method to get a number of one bits of an integer. We've created a int variable and assigned it a zero value. Then using toBinaryString() method, we're printing the binary representation and bit count using bitCount() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = 0; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bits System.out.println("Number of one bits = " + Integer.bitCount(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 0 Binary = 0 Number of one bits = 0
Example 4
The following example shows the usage of Integer bitCount() method to get a number of one bits of an integer. We've created a int variable and assigned it a negative zero value. Then using toBinaryString() method, we're printing the binary representation and bit count using bitCount() method.
package com.tutorialspoint; public class IntegerDemo { public static void main(String[] args) { int i = -0; System.out.println("Number = " + i); /* returns the string representation of the unsigned integer value represented by the argument in binary (base 2) */ System.out.println("Binary = " + Integer.toBinaryString(i)); // returns the number of one-bits System.out.println("Number of one bits = " + Integer.bitCount(i)); } }
Output
Let us compile and run the above program, this will produce the following result −
Number = 0 Binary = 0 Number of one bits = 0