import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
 
class Teste {
    public static void main(String[] args) {
        List<Object[]> lista = new ArrayList<>();
        Object[] dados = new Object[3];
        dados[0] = 1;
        dados[1] = 20;
        dados[1] = "cristiano";
        lista.add(dados);
 
        dados = new Object[3]; 
        dados[0] = 2;
        dados[1] = 40;
        dados[1] = "fulano";
        lista.add(dados);
 
        List<Integer> lista2 = lista.stream()
                .map(x -> (Integer) x[0])
                .collect(Collectors.toList());
 
        System.out.println(lista2);
    }
}

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