Frase apagando dígitos

Se sabemos separar os dígitos de caracteres
encontrados numa frase, estamos muito perto
de aprender como apagá-los.
Se não sabe como fazer, eis aqui um bom exemplo,
de como apagar dígitos contidos numa frase.

Veja abaixo o código do programa:

import java.util.Scanner;

public class PROJETO {

     public static int tam = 20;

     public static void main ( String args [ ] ) {

         J jht = new J ( );

         jht.textbackground ( jht.WHITE );

         jht.Moldura ( ( short ) 1, ( short ) 24, ( short ) 2, ( short ) 78 );

         jht.title ( " " );

         char [ ] Vet = new char [ tam ];

         int h = 0, k, i = 0, j, lenv, len_v, t;

         char [ ] digi_tos = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

         String conv = "";

         char [ ] frase = new char [ tam ];

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( int ) 28, ( int ) 3 );

         System.out.printf ( "FRASE - APAGANDO DÍGITOS" );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( int ) 16, ( int ) 5 );

         System.out.printf ( "Digite uma frase ==> " );

         jht.textcolor ( jht.LIGHTRED );

         Scanner dados = new Scanner ( System.in );

         conv = dados.nextLine ( );

         frase = conv.toCharArray();

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( int ) 16, ( int ) 7 );

         System.out.printf ( "Frase digitada ==> " );

         jht.textcolor ( jht.LIGHTRED );

         for ( i = 0; i < frase.length; i++ ) {

              System.out.print ( frase [ i ] );

         }

         jht.getche ( );

         ///////////////////////////////////////////////////////////////////

         lenv = ( digi_tos.length );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( int ) 16, ( int ) 9 );

         System.out.printf ( "Imprimindo abaixo só os caracteres da frase" );

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( int ) 16, ( int ) 11 );

         for ( i = 0; i < frase.length; i++ ) {

              for ( j = 0; j < lenv; j++ )

                   if ( frase [ i ] == digi_tos [ j ] )

                        break;

              if ( j == lenv ){

                   System.out.print ( frase [ i ] );

                   System.out.print ( " " );

              }

         }

         jht.getche ( );

        for ( i = 0; i < frase.length; i++ ) {

              for ( j = 0; j < lenv; j++ ) {

                   if ( digi_tos [ j ] == frase [ i ] ) {

                        Vet [ h ] = frase [ i ];

                        h++;

                   }

              }

         }

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( int ) 20, ( int ) 17 );

         jht.Sleep ( ( short ) 1800 );

         System.out.printf ( "Por: " );

         jht.textcolor ( jht.LIGHTMAGENTA );

         System.out.printf ( "Samuel Lima" );

         jht.textcolor ( jht.BLACK );

         jht.gotoxy ( ( int ) 20, ( int ) 18 );

         System.out.printf ( "sa_sp10@hotmail.com" );

         jht.Sleep ( ( short ) 1800 );

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( int ) 34, ( int ) 22 );

         System.out.printf ( "MUITO OBRIGADO" );

         jht.getche ( );

     }

}