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Program128.java

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import java.util.HashMap;

public class Program128 {

//First Non-Repeating Character in a String (Using HashMap)

public static void main(String[] args) {

String s = "aabbcdde";

HashMap<Character, Integer> freq = new HashMap<>();

// Count frequency of each character

for (char c : s.toCharArray()) {

freq.put(c, freq.getOrDefault(c, 0) + 1);

}

// Find the first character with frequency = 1

for (char c : s.toCharArray()) {

if (freq.get(c) == 1) {

System.out.println("First non-repeating character: " + c);

return;

}

}

System.out.println("No unique character found.");

}

}