To convert String to float in Java you can use one of the following options-
1- Float.parseFloat(String str) – Returns a new float initialized to the value represented by the specified String.
2- Float.valueOf(String s) – Returns a Float object holding the float value represented by the argument string s.
As you can see parseFloat() method returns a float primitive where as valueOf() method returns a Float object.
Java example to convert String to float using Float.parseFloat
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public class StringToFloat { public static void main(String[] args) { String str = "56.45f"; try{ float f = Float.parseFloat(str); System.out.println("value - " + f); // can be used in arithmetic operations now System.out.println(f+"/3 = " + f/3); }catch(NumberFormatException exp){ System.out.println("Error in conversion " + exp.getMessage()); throw exp; } } } |
Output
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value - 56.45 56.45/3 = 18.816668 |
For float numbers you can use “f” or “F” (even d or D which denotes double) so a String like this – “56.45f” won’t result in NumberFormatException while converting. But having any other alphabet like “56.45c” will throw exception.
Java example to convert String to float using Float.valueOf
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public class StringToFloat { public static void main(String[] args) { String str = "-55.67456"; try{ Float f = Float.valueOf(str); System.out.println("value- " + f); }catch(NumberFormatException exp){ System.out.println("Error in conversion " + exp.getMessage()); throw exp; } } } |
Output
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value- -55.67456 |
NumberFormatException
While converting string to float in Java NumberFormatException is thrown if an invalid number string is passed for conversion.
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public class StringToFloat { public static void main(String[] args) { String str = "43g"; try{ Float f = Float.valueOf(str); System.out.println("value- " + f); }catch(NumberFormatException exp){ System.out.println("Error in conversion " + exp.getMessage()); throw exp; } } } |
Output
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Error in conversion For input string: "43g" Exception in thread "main" java.lang.NumberFormatException: For input string: "43g" at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source) at sun.misc.FloatingDecimal.parseFloat(Unknown Source) at java.lang.Float.parseFloat(Unknown Source) at java.lang.Float.valueOf(Unknown Source) at com.knpcode.programs.StringToFloat.main(StringToFloat.java:8) |
That’s all for the topic How to Convert String to float in Java. If something is missing or you have something to share about the topic please write a comment.
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