Program which remove duplicate characters from String in java

Write a program which removes duplicate character from String in java?

package programnew;

import java.util.*;

public class RemoveDuplicateChar {

	public static void main(String[] args) {
		String str = "mynameisrakesh";
		Set<Character> setObj = new HashSet<>();
		StringBuffer sb = new StringBuffer();
		for(int i=0;i<str.length();i++) {
			Character c = str.charAt(i);
			if(!setObj.contains(c)) {
				setObj.add(c);
				sb.append(c);
			}
		}
	 System.out.println(sb);
	
	}
}

Output is – mynaeisrkh