Java Program To Find First Repeated And Non Repeated Character In String

Chapter: Interview Programs Last Updated: 25-03-2017 06:58:05 UTC

Program:

            /* ............... START ............... */
                
import java.util.HashMap;
import java.util.Scanner;

public class JavaFirstRepeatedAndNonRepeated {

	static void firstRepeatedNonRepeatedChar(String inputString) {
		HashMap<Character, Integer> charCountMap = new HashMap<Character, Integer>();

		char[] strArray = inputString.toCharArray();

		for (char c : strArray) {
			if (charCountMap.containsKey(c)) {

				charCountMap.put(c, charCountMap.get(c) + 1);
			} else {

				charCountMap.put(c, 1);
			}
		}

		// checking for first non-repeated character

		for (char c : strArray) {
			if (charCountMap.get(c) == 1) {
				System.out.println("First Non-Repeated Character In '" + inputString + "' is '" + c + "'");

				break;
			}
		}

		// checking for first repeated character

		for (char c : strArray) {
			if (charCountMap.get(c) > 1) {
				System.out.println("First Repeated Character In '" + inputString + "' is '" + c + "'");

				break;
			}
		}
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter the string :");

		String input = sc.next();

		firstRepeatedNonRepeatedChar(input);
	}
}
                /* ............... END ............... */
        

Output

Enter the string :
 JavaScan.com
First Non-Repeated Character In 'JavaScan.com' is 'J'
First Repeated Character In 'JavaScan.com' is 'a'

Tags

Find First Repeated And Non Repeated Character In String, Java, Interview Programs

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