Java.lang.Double.toHexString() Method



The java.lang.Double.toHexString() method returns a hexadecimal string representation of the double argument d.Some examples can be seen here:

Floating-point Value Hexadecimal String
1.0 0x1.0p0
-1.0 -0x1.0p0
2.0 0x1.0p1
3.0 0x1.8p1
0.5 0x1.0p-1
0.25 0x1.0p-2
Double.MAX_VALUE 0x1.fffffffffffffp1023
Minimum Normal Value 0x1.0p-1022
Maximum Subnormal Value 0x0.fffffffffffffp-1022
Double.MIN_VALUE 0x0.0000000000001p-1022


Following is the declaration for java.lang.Double.toHexString() method

public static String toHexString(double d)


  • d -- This is the double to be converted.

Return Value

This method returns a hex string representation of the argument.


  • NA


The following example shows the usage of java.lang.Double.toHexString() method.

package com.tutorialspoint;

import java.lang.*;

public class DoubleDemo {

   public static void main(String[] args) {

     Double d = new Double("4.0");

     /* returns a hexadecimal string representation of the
     double argument */
     String str = d.toHexString(1.0);
     System.out.println("Hex String = " + str);
     str = d.toHexString(3.0);
     System.out.println("Hex String = " + str);
     str = d.toHexString(0.25);
     System.out.println("Hex String = " + str);
     str = d.toHexString(Double.MAX_VALUE);
     System.out.println("Hex String = " + str);

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

Hex String = 0x1.0p0
Hex String = 0x1.8p1
Hex String = 0x1.0p-2
Hex String = 0x1.fffffffffffffp1023