Arrays e List

String [] arrayOfWords = new String[]{'mesa', 'cadeira', 'sofá'};
System.debug(arrayOfWords[0]);
//mesa

Integer [] numeros = new Integer[3];
numeros[0] = 32;
numeros[1] = 25;
numeros[2] = 37;

System.debug(numeros[2]);
//37

Integer [] numeros = new Integer[3];
numeros[0] = 32;
numeros[1] = 25;
numeros[2] = 37;

System.debug(numeros[2]);

//**********************************************************************
Account [] contas = new Account[3];

contas[0] = new Account(Name='Petrobrás');
contas[1] = new Account(Name='IBM');
contas[2] = new Account(Name='IBM');

System.debug(contas.size());
System.debug(contas);
contas.remove(2);
System.debug(contas.size());
System.debug(contas);

//**********************************************************************

List<String> palavras = new List<String>{'Antônio', 'José'};
System.debug(palavras.size());//2
palavras.add('Carlos');
palavras.add('Kátia');
System.debug(palavras.size());//4
System.debug(palavras);//(Antônio, José, Carlos, Kátia)
//**********************************************************************

List<String> palavras = new List<String>();
System.debug(palavras.size());//0
palavras.add('Carlos');
palavras.add('Kátia');
System.debug(palavras.size());//2
System.debug(palavras);//(Carlos, Kátia)
//**********************************************************************

List<SObject> sObjs = new List<sObject>();
System.debug(sObjs.size());//0
sObjs.add(new Contact(lastname='Pedro'));
sObjs.add(new Account(Name='IBM'));
System.debug(sObjs.size());//2
System.debug(sObjs);//(contato, conta)
System.debug(sObjs.get(1));//Conta
System.debug(sObjs[1]);//Conta
sObjs.add(new Account(Name='IBM'));
sObjs.add(new Account(Name='IBM'));
System.debug(sObjs.size());
System.debug(sObjs);
//**********************************************************************

List<SObject> sObjs = new List<sObject>();
System.debug(sObjs.size());//0
Contact cont1 = new Contact(lastname='Pedro');
sObjs.add(cont1);
Account acc1 = new Account(Name='IBM');
sObjs.add(acc1);
System.debug(sObjs.size());//2
System.debug(sObjs);//(contato, conta)
System.debug(sObjs.get(1));//Conta
System.debug(sObjs[1]);//Conta
Account acc2 = new Account(Name='IBM');
sObjs.add(acc2);
Account acc3 = new Account(Name='IBM');
sObjs.add(acc3);
System.debug(sObjs.size());
System.debug(sObjs);
//**********************************************************************

class Cachorro{
    String pelo = 'liso';
    String cor = 'preto';
    public Cachorro(){

    }
    public Cachorro(String pelo, String cor){
        pelo = pelo;
        cor = cor;
    }
}
List<Object> objs = new List<Object>();
objs.add(new Account(Name='IBM'));
objs.add('Airton');
objs.add(new Cachorro('liso', 'branco'));
Cachorro c = new Cachorro('liso', 'preto');
System.debug(c.cor);
objs.add(c);
objs.add(15);
System.debug(objs.size());
System.debug(objs);

System.debug('Objeto no índice 0 da lista: '+objs[0]); //Conta
System.debug('Objeto no índice 2 da lista: '+objs[2]); //Cachorro
System.debug('Objeto no índice 4 da lista: '+objs[4]); //Integer

//Quero pegar a cor do pelo do 2º cachorro
Cachorro d = new Cachorro();
d = (Cachorro)objs[3];
System.debug(d.cor);
System.debug(((Account)objs[0]).Name);
System.debug(((SObject)objs[0]).get('Name')); //Aqui o get funciona por se
//tratar de um sObject