Home Java Java-conversion Convert String To Double

Convert String To Double
Posted on: July 5, 2007 at 12:00 AM

In this section, we are going to convert a numeric type string value into a double.

Convert String To Double

In this section, we are going to convert a numeric type string value into a double. The double supports big-integer value.

Code Description:

This program simply takes a numeric type string at the console with the "Enter numeric type string value:" message and it converts into a double. The doubleValue() method returns the double value of this double object. And Double class wraps a value of the primitive type double in an object. Finally, it we get the value to be converted into a double.

Here is this the code of this program:


import java.io.*;

import java.lang.*;



public class StringToDouble{

  public static void main (String[] args) throws IOException{

  BufferedReader bff= new BufferedReader(new InputStreamReader(System.in));

  System.out.println("Enter numeric
    type string value:");

  String num
    = bff.readLine();

  try{

  double d = Double.valueOf(num.trim()).doubleValue();

  System.out.println("double d = " + d);

  }

  catch (NumberFormatException e){

  System.out.println("NumberFormatException: " + e.getMessage());

  }

  }

}

Download this program:

Output of this program given below.

C:\corejava>java StringToDouble
Enter string value:
23
double d = 23.0
C:\corejava>

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