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Java / Programs

Java program to find the first non-repeating character in a String.

public class FirstNonRepeatingChar {
	
	public static void main(String[] args) {
		String str = "abccak";
		HashMap<Character,Boolean> myLinkedMap = new LinkedHashMap<>();
		
		for (int i=0; i<str.length(); i++) {
			char c = str.charAt(i);
			if (myLinkedMap.containsKey(c)) {
				myLinkedMap.put(c, false);
			} else {
				myLinkedMap.put(c,true);
			}
		}
		
		System.out.println ("First non-repeating char: " + myLinkedMap.entrySet().stream().filter(map ->map.getValue() == true).findFirst().map (p -> p.getKey()));
		
	}

}

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