Java programing code
    import java.util.Scanner;
     
    class SubstringsOfAString
    {
       public static void main(String args[])
       {
          String string, sub;
          int i, c, length;
     
          Scanner in = new Scanner(System.in);
          System.out.println("Enter a string to print it's all substrings");
          string  = in.nextLine();
     
          length = string.length();   
     
          System.out.println("Substrings of \""+string+"\" are :-");
     
          for( c = 0 ; c < length ; c++ )
          {
             for( i = 1 ; i <= length - c ; i++ )
             {
                sub = string.substring(c, c+i);
                System.out.println(sub);
             }
          }
       }
    }