public class  {  
    
    public boolean checkDifferent(String iniString) {  
        for (int i = 0;i<iniString.length();i++) {  
            for (int j = i+1;j<iniString.length();j++) {  
                if (iniString.charAt(i) == iniString.charAt(j))  
                    return false;  
            }  
        }  
        return true;