Java - Double toHexString() method

Description

The Java 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

Declaration

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

public static String toHexString(double d)

Parameters

d − This is the double to be converted.

Return Value

This method returns a hex string representation of the argument.

Exception

NA

Example 1

The following example shows the usage of Double toHexString(double) method to get a hex string representation of a double. We're showing multiple hex representation of positive double values along with hex representation of max double value.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {

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

Output

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

Example 2

The following example shows the usage of Double toHexString(double) method to get a hex string representation of a double. We're showing multiple hex representation of negative double values along with hex representation of min double value.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {

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

Output

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 = 0x0.0000000000001p-1022

Example 3

The following example shows the usage of Double toHexString(double) method to get a hex string representation of a double. We're showing multiple hex representation of negative and positive zero values.

package com.tutorialspoint;
public class DoubleDemo {
   public static void main(String[] args) {

      /* returns a hexadecimal string representation of the
         double argument */
      String str = Double.toHexString(-0.0);
      System.out.println("Hex String = " + str);
    
      str = Double.toHexString(0.0);
      System.out.println("Hex String = " + str);
   }
}

Output

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

Hex String = -0x0.0p0
Hex String = 0x0.0p0
java_lang_double.htm
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