Java Program To Check Whether All Characters In A String Is Unique

 package demo;

import java.util.Arrays;

import java.util.Collections;

import java.util.HashSet;

import java.util.Set;

import java.util.stream.Collectors;

public class StringUnique {

private static boolean isUniqueJava8(String str) {

return str.chars().filter(e -> Collections.frequency(str.chars().boxed().collect(Collectors.toList()), e) > 1)

.count() > 1 ? Boolean.FALSE : Boolean.TRUE;

}

private static boolean isUnique(String str) {

char[] ch = str.toCharArray();

Arrays.sort(ch);

int size = ch.length - 1;

for (int i = 0; i < size; i++) {

if (ch[i] == ch[i + 1]) {

return false;

}

}

return true;

}

public static void main(String[] args) {

System.out.println(isUnique("upenndra"));

System.out.println(isUniqueJava8("upenndra"));

}

}