hashmap - o método containsKey

Quando queremos pesquisar um valor dentro
de um mapa, basta invocarmos o método containskey.
Neste exemplo, criei uma variável booleana
que retornará true, se por acaso temos o valor
pesquisado, ou false se por acaso não exista,
que ver isto de perto? me siga:

Veja abaixo uma imagem do programa em execução:

 Veja abaixo o código do programa:

import java.util.HashMap;

import java.util.Map;

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;

         Map < Integer, String  > frutas = new HashMap < > ( );

         frutas.put ( 5, "Figo" );

         frutas.put ( 2, "Banana" );

         frutas.put ( 4, "Damasco" );

         frutas.put ( 3, "Caqui" );

         frutas.put ( 1, "Amora" );

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

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( short ) 21, ( short ) 2 );

         System.out.printf ( "HASHMAP - O MÉTODO CONTAINSKEY" );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 14, ( short ) 4 );

         System.out.print ( "Abaixo a impressão das chaves e dos valores" );

         for ( i = 1; i < 6; i++ ) {

              jht.gotoxy ( ( short ) 24, ( short ) i + 5 );

              jht.textcolor ( jht.LIGHTRED );

              System.out.printf ( "%d => ", i );

              jht.textcolor ( jht.BLACK );

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

         }

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

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 14, ( short ) 12 );

         System.out.printf ( "Pesquisando um valor associado a uma chave " );

         jht.textcolor ( jht.BLACK );

         jht.gotoxy ( ( short ) 14, ( short ) 14 );

         jht.textcolor ( jht.LIGHTBLUE );

         System.out.println ("Temos a fruta ");

         jht.textcolor ( jht.LIGHTRED );

         boolean tem = frutas.containsKey ( 3 );

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

         System.out.println ( frutas.get ( 3 ) );

         jht.textcolor ( jht.LIGHTBLUE );

         jht.gotoxy ( ( short ) 34, ( short ) 14 );

         System.out.println ("no hashMap ? => " );

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( short ) 47, ( short ) 14 );

         System.out.println ( tem );

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

         jht.textcolor ( jht.BLACK );

         jht.gotoxy ( ( short ) 14, ( short ) 16 );

         jht.textcolor ( jht.LIGHTBLUE );

         System.out.println ("Temos a fruta ");

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( short ) 28, ( short ) 16 );

         System.out.print ( "Abacaxi " );

         jht.textcolor ( jht.LIGHTBLUE );

         System.out.println ("no hashMap ? => ");

         jht.gotoxy ( ( short ) 34, ( short ) 16 );

         jht.textcolor ( jht.LIGHTRED );

         jht.gotoxy ( ( short ) 47, ( short ) 16 );

         System.out.print ( frutas.containsKey ( "Abacaxi" ) );

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

         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 ( );

     }

}