Convert string to float: "8.9km" to float

Question

I'm getting the distance in string like "8.9km". I need to convert it to float.

So if the string is "8.9km", the corresponding float will be 8.9

How to achieve this in Java?

Note: The value can change to miles/meters also, since it is retrieved from Google Maps

possible duplicate of [How to split a text file into words?](http://stackoverflow.com/questions/649407/how-to-split-a-text-file-into-words) — Siddharth, Aug 02 '14 at 09:38
You have to do it in two steps: remove the "km" part; then parse the float http://javarevisited.blogspot.it/2013/08/how-to-parse-string-to-float-in-java-to-float-example.html — Vitaly Olegovitch, Aug 02 '14 at 09:39
http://stackoverflow.com/questions/7552660/java-convert-float-to-string-and-string-to-float — Pritesh Mahajan, Aug 02 '14 at 09:39
Should this be `8.9` or `8900`? i.e. should it read the `k` as well? BTW don't use `float` unless there is a very good reason `double` has close to one billion times the accuracy. — Peter Lawrey, Aug 02 '14 at 09:48
@PeterLawrey he stated that the output for this example should be `8.9` — bcsb1001, Aug 02 '14 at 09:48
@bcsb1001 I guess I am hinting that is likely to be a bad idea if you want to support meters. — Peter Lawrey, Aug 02 '14 at 09:51

Aditya · Accepted Answer · 2014-08-02T09:49:46.233

3

You can try the following code,

String dis = "8.9km";
Float distance = Float.valueof(dis.substring(0,dis.indexOf("km")));
float d = distance.floatValue();

edited Aug 02 '14 at 09:49

answered Aug 02 '14 at 09:40

Aditya

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You did not write how to remove the "km" part of the string – Vitaly Olegovitch Aug 02 '14 at 09:41

score 1 · Answer 2 · answered Aug 02 '14 at 09:40

1

You can do

String distance = "8.9km";
float distanceInFloat = Float.parseFloat(distance.substring(0,distance.indexOf("km")));
System.out.println(distanceInFloat);

Output :

8.9

answered Aug 02 '14 at 09:40

Aniket Thakur

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Please create a float variable to make the example more clear – Vitaly Olegovitch Aug 02 '14 at 09:40
But this will parse a float even if 'km' is in the middle of the string e.g. "1.5km Some Text" will return 1.5 with your method, despite it clearly being invalid input. – bcsb1001 Aug 02 '14 at 09:46
1

@bcsb1001 OP has clearly stated `I'm getting the distance in string like "8.9km".` and I have answered based on that. Question says nothing otherwise. Validation if any should be taken care separately. – Aniket Thakur Aug 02 '14 at 09:48

score 1 · Answer 3 · answered Aug 02 '14 at 09:41

1

Use following code:

    String s="8.9km";
    s=s.replace("km", "");
    float f=Float.parseFloat(s);
    System.out.println(f);

Output:

8.9

Hope it helps.

answered Aug 02 '14 at 09:41

Darshan Lila

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But then an invalid input string, such as "1km.km5", will be parsed as "1.5", despite clearly being invalid input. – bcsb1001 Aug 02 '14 at 09:48
In that case spilt from "." and then go ahead. – Darshan Lila Aug 02 '14 at 09:49

score 1 · Answer 4 · answered Aug 02 '14 at 09:43

1

try the following for removing all non-digits(excluding '.') from a string

String distance = "7.9km";
float floatValue = Float.parseFloat(distance.replaceAll("[^\\d.]",""));
System.out.println(floatValue);

answered Aug 02 '14 at 09:43

pratZ

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score 1 · Answer 5 · answered Aug 02 '14 at 09:44

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String str = "8.9km";
str = (str.replace("km", ""); //remove the km
float f = Float.parseFloat(str); //convert the string to a float

The float f will now have a value of 8.9

System.out.println(f);

Output:

8.9

answered Aug 02 '14 at 09:44

Isaac Adni

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The value can change to miles/meters also, since it is retrieved from Google Maps – webgenius Aug 02 '14 at 09:52
1

@webgenius you can use try/catch `try { str = (str.replace("km", ""); str = (str.replace("miles", ""); str = (str.replace("meters", ""); } catch (Exception e) { }` Then you will have your string without the km, miles or meters, as although it will not be able to do two of the three statements, it will be able to do the other one, and the try/catch stops the other two from causing errors. – Isaac Adni Aug 02 '14 at 10:35

bcsb1001 · Answer 6 · 2014-08-02T09:51:48.300

Try this:

public float parse(String string, String suffix) { // suffix can be m, km etc.
    if (!string.endsWith(suffix)) {
        throw new IllegalArgumentException();
    }
    string = string.subString(0, string.length() - suffix.length()); // get rid of the suffix we have at the end
    return Float.parseFloat(string); // parse the float from what we have left
}

If the float is invalid, or the string doesn't end in "km", a NumberFormatException or IllegalArgumentException will be thrown, respectively.

score 1 · Answer 7 · answered Aug 02 '14 at 10:01

1

Try this.. i hope it will help

String km = "8.9km";
float kmInFloat=Float.parseFloat(km.replaceAll("km",""));
System.out.println(kmInFloat);

Output : 8.9

answered Aug 02 '14 at 10:01

one

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Convert string to float: "8.9km" to float

7 Answers7