[Solved] How to check a string for white spaces

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You can know how many whitespaces user entered by doing this:

Scanner sc = new Scanner(System.in);
System.out.println("Enter word with white-spaces:");
String str = sc.nextLine();
int totalSpace = str.split(" ").length-1;
System.out.println("total white-spaces is:"+totalSpace);

Edit: You can solve you problem by changing your while condition like this:

 while(!(guessedSpaces.replaceAll("\\d","").length()==3 && guessedSpaces.split(" ").length-1==3)){
    .....
    .....
    System.out.println("Enter word with white-spaces:");
    guessedSpaces = keyboard.nextLine();
}

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solved How to check a string for white spaces