Convert double to float in Java

Question

I am facing an issue related to converting double to float  Actually  I store a float type  23423424666767  in a database  but when we get data from the database in the below code  getInfoValueNumeric    it s of double type  The value we get is in the 2 3423424666767E13 form   So how do we get a float format data like 23423424666767   2 3423424666767E13 to 23423424666767  public void setInfoValueNumeric java lang Double value        setValue 4  value        javax persistence Column name    InfoValueNumeric   precision   53  public java lang Double getInfoValueNumeric         return  java lang Double  getValue 4

User · Answer

Float parseFloat String valueOf your number

User · Answer

To answer your query on  How to convert 2 3423424666767E13 to   23423424666767    You can use a decimal formatter for formatting decimal numbers         double d   2 3423424666767E13       DecimalFormat decimalFormat   new DecimalFormat            System out println decimalFormat format d      Output   23423424666767

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This is a nice way to do it   Double d   0 5  float f   d floatValue      if you have d as a primitive type just add one line   double d   0 5  Double D   Double valueOf d   float f   D floatValue

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First of all  the fact that the value in the database is a float does not mean that it also fits in a Java float  Float is short for floating point  and floating point types of various precisions exist  Java types float and double are both floating point types of different precision  In a database both are called FLOAT  Since double has a higher precision than float  it probably is a better idea not to cast your value to a float  because you might lose precision   You might also use BigDecimal  which represent an arbitrary-precision number

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The problem is  your value cannot be stored accurately in single precision floating point type  Proof   public class test      public static void main String   args           Float a   Float valueOf  23423424666767            System out printf   f n   a     23423424135168 000000         System out println a            2 34234241E13           Another thing is  you don t get  2 3423424666767E13   it s just the visual representation of the number stored in memory   How you print out  and  what is in memory  are two distinct things  Example above shows you how to print the number as float  which avoids scientific notation you were getting

User · Answer

Use dataType casting   For example      converting from double to float  double someValue     cast someValue to float  float newValue    float someValue    Cheers   Note    Integers are whole numbers  e g  10  400  or -5   Floating point numbers  floats  have decimal points and decimal places  for example 12 5  and 56 7786543   Doubles are a specific type of floating point number that have greater precision than standard floating point numbers  meaning that they are accurate to a greater number of decimal places

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Convert Double to Float  public static Float convertToFloat Double doubleValue        return doubleValue    null   null   doubleValue floatValue        Convert double to Float  public static Float convertToFloat double doubleValue        return  float  doubleValue

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Just cast your double to a float   double d   getInfoValueNumeric    float f    float d    Also notice that the primitive types can NOT store an infinite set of numbers   float range  from 1 40129846432481707e-45 to 3 40282346638528860e 38 double range  from 1 7e   308 to 1 7e 308

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Converting from double to float will be a narrowing conversion  From the doc      A narrowing primitive conversion may lose information about the   overall magnitude of a numeric value and may also lose precision and   range       A narrowing primitive conversion from double to float is governed by   the IEEE 754 rounding rules    4 2 4   This conversion can lose   precision  but also lose range  resulting in a float zero from a   nonzero double and a float infinity from a finite double  A double NaN   is converted to a float NaN and a double infinity is converted to the   same-signed float infinity    So it is not a good idea  If you still want it you can do it like   double d   3 0  float f    float  d

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I suggest you to retrieve the value stored into the Database as BigDecimal type   BigDecimal number   new BigDecimal  2 3423424666767E13     int myInt   number intValue    double myDouble   number doubleValue        your purpose float myFloat   number floatValue      BigDecimal provide you a lot of functionalities

[java] Convert double to float in Java

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