How to convert String to double and double to string in java


In this core java tutorial we will learn how to convert String to double primitive type in java and convert String to double object with program and examples in java. We will  also understand  When to use convert String to double primitive type and when when to convert String to double object in java.

Also read :


Programs  to convert String to double in java -
  • Program/Example 1 to How to convert String to double primitive type in java.
  • Program/Example 2 to How to convert String to double object in java.


Program/Example 1 to How to convert String to double primitive type in java

Double.parseDouble(string) method returns primitive type double object.

package convertStringToDoublePkg;
public class ConvertStringToDoubleExample1 {
   public static void main(String[] args) {
          String string = "12";
          try {
                 double d = Double.parseDouble(string);
                 System.out.println("double number = " + d);
          } catch (NumberFormatException e) {
                 e.printStackTrace();
          }
   }
}
/*OUTPUT
double number = 12.0
*/

If in case invalid string is passed which can't get converted to double will throw NumberFormatException in java.




Program/Example 2 to How to convert String to double object in java

Double.valueOf(string) method returns double object.

package convertStringToDoublePkg;
public class ConvertStringToDoubleExample2 {
   public static void main(String[] args) {
          String string = "12";
          Double doubleObject  = Double.valueOf(string);
          System.out.println("double doubleObject = " + doubleObject);
         
   }
}
/*OUTPUT
double doubleObject = 12.0
*/





Programs to convert double to String in java -
  • Program/Example 3 to How to convert double primitive type to String  in java.
  • Program/Example 4 to How to convert double object to String in java


Now, in this core java tutorial we will learn how to convert double primitive type to String in java and convert double object to String with program and examples in java. We will  also understand  When to use convert String to double primitive type and when when to convert String to double object in java.

Program/Example 3 to How to convert double primitive type to String  in java.

String.valueOf(double) method converts double primitive type to String  in java.

package convertDoubleToStringPkg;
public class ConvertDoubleToStringExample1 {
   public static void main(String[] args) {
         
          double d = 12d;
          String string = String.valueOf(d);
          System.out.println("string = "+string);
  
   }
}
/*OUTPUT
string = 12.0

*/



Program/Example 4 to How to convert double object to String in java
toString() method of java.lang.Double class convert double object to String in java.
package convertDoubleToStringPkg;
public class ConvertDoubleObjectToStringExample2 {
   public static void main(String[] args) {
          Double doubleObject = 12d;
          String string = doubleObject.toString();
          System.out.println("string = "+string);
  
   }
}
/*OUTPUT
string = 12.0
*/






Summary -



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