Generate fixed length Strings filled with whitespaces

java string formatting
Rafael Borja picture Rafael Borja · Nov 20, 2012 · Viewed 205.4k times · Source

I need to produce fixed length string to generate a character position based file. The missing characters must be filled with space character.

As an example, the field CITY has a fixed length of 15 characters. For the inputs "Chicago" and "Rio de Janeiro" the outputs are 

"        Chicago"
" Rio de Janeiro"
.

Answer

Rafael Borja picture Rafael Borja · Nov 20, 2012

Since Java 1.5 we can use the method java.lang.String.format(String, Object...) and use printf like format.

The format string "%1$15s" do the job. Where 1$ indicates the argument index, s indicates that the argument is a String and 15 represents the minimal width of the String. Putting it all together: "%1$15s".

For a general method we have:

public static String fixedLengthString(String string, int length) {
    return String.format("%1$"+length+ "s", string);
}

Maybe someone can suggest another format string to fill the empty spaces with an specific character?

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