Last Updated : 13 Dec, 2021
The Integer.highestOneBit() method of java.lang returns an integer value with at most a single one-bit which is in the position of the highest-order (ie.leftmost) one-bit for the given int value. If the specified value has no one-bits in its two's complement binary representation then it returns zero, simply if it is equal to zero.
Syntax:
public static int highestOneBit(int a)
Parameters: The method takes one parameter a of integer type that refers to the value whose highest order bit is to be returned or on which the operation is to be performed.
Returns : The method can return two types of values:
Examples:
Input: 19 Output: Highest one bit of the given integer is = 16 Input: -9 Output: Highest one bit of the given integer is = -2147483648 Explanation: Consider any integer a = 19 Binary Representation = 0001 0011 Highest bit(at 4) i.e.0001 0000 so result = 2^4=16
Below programs illustrate the Java.lang.Integer.highestOneBit() Method.
Program 1: For a positive number.
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = 29;
System.out.println("Number is = " + a);
// returns an int value with at most a single one-bit, in the position
// of the highest-order or the leftmost one-bit in the specified int value
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
a = 44;
System.out.println("Number is = " + a);
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
Number is = 29 Highest one bit of the given integer is = 16 Number is = 44 Highest one bit of the given integer is = 32
Program 2: For a negative number.
java
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = -9;
System.out.println("Number is = " + a);
// returns an int value with at most a single one-bit, in the position
// of the highest-order or the leftmost one-bit in the specified int value
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
Number is = -9 Highest one bit of the given integer is = -2147483648
Program 3: For a decimal value.
Note:It returns an error message when a decimal value is passed as an argument because of incompatible types.
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = 84.22;
System.out.println("Number is = " + a);
// decimal value 84.22 is passed here
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
prog.java:9: error: incompatible types: possible lossy conversion from double to int
int a = 84.22;
^
1 error
Program 4: For a String.
Note:It returns an error message when a String is passed as an argument because of incompatible types.
// Java program to illustrate the
// Java.lang.Integer.highestOneBit() Method
import java.lang.*;
public class HighestOneBit {
public static void main(String[] args)
{
int a = "34";
System.out.println("Number is = " + a);
// decimal value 84.22 is passed here
System.out.print("Highest one bit of the given integer is = ");
System.out.println(Integer.highestOneBit(a));
}
}
prog.java:9: error: incompatible types: String cannot be converted to int
int a = "34";
^
1 error
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