CODEWITHSUNDEEP
javastringformatting
user15071395
user15071395

Reputation:

Why aren't commas added when I use String.format method?

public class TestFormats {
    public static void main(String[] args) {
        String str1 = String.format("%,d", 100000000);
        System.out.println(str1);
    }
}

I'm trying to separate digits of the number by commas using the method with the given parameters but, for some reason, commas aren't being added to the number, the only thing that's changed is that whitespaces emerged.

How can I make this work? Why isn't working, what's wrong?

Upvotes: 1

Views: 306

Answers (3)

Lasnik
Lasnik

Reputation: 254

It is because of your Location. Add the Locale object as an argument to the String.format() function

    import java.util.Locale;
    
    public class TestFormats {
        public static void main(String[] args) {
            // Uses commas 
            Locale localeEn = new Locale.Builder().setLanguage("en").build();
            String str1 = String.format(localeEn, "%,d", 100_000_000);
            System.out.println(str1); //output: 100,000,000
            
            // Uses dots
            Locale localeDe = new Locale.Builder().setLanguage("de").build();
            String str2 = String.format(localeDe, "%,d", 100_000_000);
            System.out.println(str2); //output: 100.000.000
            
            // Uses spaces
            Locale localeRu = new Locale.Builder().setLanguage("ru").build();
            String str3 = String.format(localeRu, "%,d", 100_000_000);
            System.out.println(str3); //output: 100 000 000
        }
    }

Upvotes: 3

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79085

Most likely, your system Locale is not set to ENGLISH. Use Locale.ENGLISH as shown below:

import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String str1 = String.format(Locale.ENGLISH, "%,d", 100000000);
        System.out.println(str1);
    }
}

Output:

100,000,000

Upvotes: 0

OscarRyz
OscarRyz

Reputation: 199225

Your code looks good to me:

jshell>String str1 = String.format("%,d", 100000000);
...> 
str1 ==> "100,000,000"

Probably you're executing a different file (copy/pasted and buffer is showing the wrong file, happens to me all the time)

Upvotes: 0

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