JavaStream: Characters

Saurabh Sharma

Continuing from the last blog how about checking a pangram using streams.

public class PangramChecker {

    private String allChars = "abcdefghijklmnopqrstuvwxyz";

    public boolean isPangram(String input) {
        if (input.length() <= 0 || input.isBlank()){
            return false;
        }
        return (allChars.chars().map(x -> (char) x).filter(x -> input.toLowerCase().indexOf(x) >= 0).count() == 26);
    }

}

All the for loops have been squeezed into a simple line

The Logic

  • Define a String for all the characters in the English language – allChars
  • Get the Stream using allChars.chars()
  • Since it returns an int map it to Char
  • Look for every character one by one in the Input String using indexOf. (It returns -1 for character not found.)
  • Get the count of all the characters found, if anyone was not found we will have less than 26.

It can be further optimized… want to try?

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