Question

How to remove repeated characters from string in Java

Answer 1

public class MyClass {
    public static String removeRepeatedCharactersFromString(String str) {
        StringBuilder sb = new StringBuilder();
        
        str.chars().distinct().forEach(ch -> sb.append((char) ch));
        
        return sb.toString();
    }

    public static void main(String args[]) {
        
        String str = "The quick brown fox jumps over the lazy dog";
        
        str = removeRepeatedCharactersFromString(str);
        
        str = removeRepeatedCharactersFromString(str);
        
        System.out.println(str);
    }
}




/*
run:

The quickbrownfxjmpsvtlazydg

*/

 

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Answer 2

public class MyClass {
    public static String removeRepeatedCharactersFromString(String str) {
        StringBuilder sb = new StringBuilder();
        
        int index;
        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            index = str.indexOf(ch, i + 1);
            if (index == -1) {
                sb.append(ch);
            }
        }
         
        return sb.toString();
    }
 
    public static void main(String args[]) {
         
        String str = "The quick brown fox jumps over the lazy dog";
         
        str = removeRepeatedCharactersFromString(str);
         
        str = removeRepeatedCharactersFromString(str);
         
        System.out.println(str);
    }
}
 
 
 
 
/*
run:
 
Tqickbwnfxjumpsvrthelazy dog
 
*/

 

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