is String having Unique Character Using Loop - Java Algorithm

Java examples for Algorithm:String

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Description

is String having Unique Character Using Loop

Demo Code


public class Main {
  public static boolean isUnique(String str){
    // Time: O(n^2), Space: take extra space to sort
    for(int i=0; i<str.length(); i++){
      for(int j=i+1; j<str.length(); j++){
        if(str.charAt(i)==str.charAt(j)) return false;
      }//from   w  w  w .j a  v  a2s .  com
    }
    return true;
  }
  // Test
  public static void main(String[] args){
    String str="Hello";
    System.out.print(isUnique(str)+" ");
    String str_2="";
    System.out.print(isUnique(str_2)+" ");
    String str_3="He";
    System.out.print(isUnique(str_3)+" ");
    String str_4="  ";
    System.out.print(isUnique(str_4)+" ");
  }
}

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