Question

How to convert String to a unique Set of Characters in Java

Answer 1

import java.util.*; 
import java.util.stream.Collectors;

public class MyClass {
    public static Set<Character> convertStringToCharList(String s) { 
      List<Character> list = new ArrayList<Character>();
      Set<Character> uniqueSet = new HashSet<Character>();
      for (char ch : s.toCharArray()) {
            list.add(ch);
            uniqueSet.add(ch);
      }
  
      return uniqueSet; 
    } 
    public static void main(String args[]) {
      String s = "java programming"; 
  
      Set<Character> charSet = convertStringToCharList(s); 

      System.out.println(charSet);
    }
}



/*
run:

[ , p, a, r, v, g, i, j, m, n, o]

*/

 

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Answer 2

import java.util.*; 
import java.util.stream.Collectors;
 
public class MyClass {
    public static Set<Character> convertStringToCharList(String s) { 
      Set<Character> charSet = s.chars().mapToObj(e->(char)e)
                                          .collect(Collectors.toSet());
      return charSet; 
    } 
    public static void main(String args[]) {
      String s = "java programming"; 
   
      Set<Character> charSet = convertStringToCharList(s); 
 
      System.out.println(charSet);
    }
}
 
 
 
/*
run:
 
[ , p, a, r, v, g, i, j, m, n, o]
 
*/

 

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Answer 3

import java.util.*; 

public class MyClass {
    public static void main(String args[]) {
      String s = "java programming"; 
      Set<Character> charSet = new HashSet<Character>();
   
      for (char ch : s.toCharArray()) {
            charSet.add(ch);
      }
 
      System.out.println(charSet);
    }
}
 
 
 
/*
run:
 
[ , p, a, r, v, g, i, j, m, n, o]
 
*/

 

70+ SQL courses for beginners and professionals