Checking Whether The String Contains Number or Not in Java

public class NumberInString {
 
        public static void main(String[] args) {
               
                String[] str = new String[]{"32455", "44.6", "45.isvalid"};
               
                for(int i=0 ; i < str.length ; i ++)
                {
                       
                        if( str[i].indexOf(".") > 0 )
                        {
                       
                                try
                                {
                                        Double.parseDouble(str[i]);
                                        System.out.println(str[i] + " is a valid decimal number");
                                }
                                catch(NumberFormatException nme)
                                {
                                        System.out.println(str[i] + " is not a valid decimal number");
                                }
                               
                        }
                        else
                        {
                                try
                                {
                                        Integer.parseInt(str[i]);
                                        System.out.println(str[i] + " is valid integer number");
                                }
                                catch(NumberFormatException nme)
                                {
                                        System.out.println(str[i] + " is not a valid integer number");
                                }
                        }
                }
               
        }
}