UnknownFormatConversionException: Conversion = ' '

Question

First, thank you for spending some time on this problem. I've tried based on my own knowledge but can not find out where to modify. I have made a game and in the end, I have to return the formatted string to the terminal.

The exception appeared when I change basic string concatenation to the formatted string. I don't know how to fix it.

players is the player array.
WinRatio is score(int) divided by gamePlayed(int), rounding to integer.

Here is part of my code.

public static void searchAndPrintRankingDataDesc() {
    NimPlayer [] players = NimPlayer.getPlayer();
    Arrays.sort(players, Comparator.comparing((NimPlayer::getWinRatio)).reversed().thenComparing(NimPlayer::getUserName));
    Arrays.stream(players).forEach(System.out::println);

And my toString method:

public String getWinRatio() {
    return Integer.toString(Math.round(Float.valueOf(getScore())/ (getGamePlayed())*100));
}

public String toString() {
    return String.format( "%02d" +"% | "+ "%02d" +" games | "+ "%s " + "%s", getWinRatio(), gamePlayed, givenName, familyName);
}

Thanks, but there is another popped out for illegerConversion. And I change `getWinRatio` back to int type. Problem solved. Thanks @Renato — Woden, Apr 27 '20 at 13:12

score 2 · Accepted Answer · answered Apr 27 '20 at 13:17

2

% is a special character for String.format, to escape %, you will have to replace it with %%. So your statement becomes-

String.format( "%02d" +"%% | "+ "%02d" +" games | "+ "%s " + "%s", getWinRatio(), gamePlayed, givenName, familyName);

answered Apr 27 '20 at 13:17

Jagriti Sethi

36
3

score 1 · Answer 2 · answered Apr 27 '20 at 13:17

When using % in the formatted string, it has to be escaped using another %. And when formatting the integer value, it will get IllegalFormatConversionException if there has already a toString method.

This code here formatted the integer to string.

public String getWinRatio() {
return Integer.toString(Math.round(Float.valueOf(getScore())/ (getGamePlayed())*100));

}

And the code below formatted again, causing IllegalFormatConversionException.

public String toString() {
return String.format( "%02d" +"% | "+ "%02d" +" games | "+ "%s " + "%s", getWinRatio(), gamePlayed, givenName, familyName);

}

So, the answer will be:

public int getWinRatio() {
    return Math.round(Float.valueOf(getScore())/ (getGamePlayed())*100);
}
public String toString() {
    return String.format( "%02d" +"%%" + " | "+ "%02d" +" games | "+ "%s " + "%s", getWinRatio(), gamePlayed, givenName, familyName);
}

UnknownFormatConversionException: Conversion = ' '

2 Answers2