ArrayList - o método replaceall

Podemos apontar um elemento na lista,
e substituir todas as suas ocorrências
Para isto foi criado o método replaceall
Este método retorna true se a lista conter
o elemento a ser Substituído,
se não conter o retorno é false.

Veja abaixo uma imagem do programa em execução:

Veja abaixo o código do programa:

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

public class PROJETO {

     public static void main ( String args [ ] ) {

         J jht = new J ( );

         jht.textbackground ( jht.WHITE );

         jht.Moldura ( ( short ) 1, ( short ) 24, ( short ) 2, ( short ) 68 );

         jht.title ( " " );

         int i;

         boolean x = false;

         ArrayList < String > arrList = new ArrayList <> ( Arrays.asList (

                   "9", "1", "8", "2", "9", "3" ) );

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( short ) 22, ( short ) 3 );

         System.out.printf ( "ARRAYLIST - O MÉTODO REPLACEALL" );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 18, ( short ) 5 );

         System.out.printf ( "Abaixo a impressão normal do ArrayList" );

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

         jht.textcolor ( jht.BLACK );

         for ( i = 0; i < arrList.size ( ); i++ ) {

              if ( i == 0 )

                   jht.gotoxy ( ( int ) 28, ( int ) 7 );

              System.out.print ( " " );

              System.out.printf ( arrList.get ( i ) );

         }

         jht.getche ( );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 18, ( short ) 9 );

         System.out.printf ( "Substituiremos as ocorrências de" );

         jht.textcolor ( jht.LIGHTRED );

         System.out.printf ( " 9" );

         jht.textcolor ( jht.LIGHTBLUE );

         System.out.printf ( " por" );

         jht.textcolor ( jht.LIGHTRED );

         System.out.printf ( " 4" );

         //Substituindo todas as ocorrências de 9 por 4

         x = Collections.replaceAll ( arrList, "9", "4" );

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

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 18, ( short ) 12 );

         System.out.printf ( "ArrayList com seus valores substituídos" );

         jht.textcolor ( jht.LIGHTMAGENTA );

         for ( i = 0; i < arrList.size ( ); i++ ) {

              if ( i == 0 )

                   jht.gotoxy ( ( int ) 28, ( int ) 14 );

              System.out.print ( " " );

              System.out.print ( arrList.get ( i ) );

         }

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 18, ( short ) 16 );

         System.out.printf ( "O método retornou " );

         jht.textcolor ( jht.LIGHTRED );

         System.out.print ( x );

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

         jht.textbackground ( jht.WHITE );

         jht.Sleep ( ( short ) 1800 );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 23, ( short ) 19 );

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

         jht.textcolor ( jht.LIGHTBLUE );

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

         jht.textcolor ( jht.BLACK );

         jht.gotoxy ( ( short ) 23, ( short ) 20 );

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

         jht.Sleep ( ( short ) 1800 );

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( short ) 29, ( short ) 22 );

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

         jht.getche ( );

     }

}