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
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
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
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
value- -55.67456
NumberFormatException
While converting string to float in Java NumberFormatException is thrown if an invalid number string is passed for conversion.
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
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)
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