C# IEnumerable methods equivalents in Java List

Question

How to write this logic, made in C#, in Java?

var posicoes = await _serviceProduto.BuscarClienteProduto(_userId, _userTipo, null, null);
var clientes = await _service.BuscarCliente(_userId, _userTipo, null);

var t = clientes.Where(a => !posicoes.Any(b => b.ClienteId == a.ClienteId)).ToList();
return Ok(t);

Whats the type of "var t"? The return of "BuscarClienteProduto" or "BuscarCliente"?

I'm doing something like this (it has some compiling errors):

Do you have any idea of what method is equivalent for "Any()"? Or should I make it all diffent?

List<CustomerProductResponse> posicoes = customerProductService.getClienteProduto(null, idUser, _userTipo, null);
List<CustomerResponse> clientes = customerService.getCliente(null, idUser, _userTipo);

List<CustomerResponse> lista = clientes.stream()
                .filter(a -> !posicoes.xxx(b -> b.clienteId == a.clienteId))
                .map(b -> new CustomerResponse(b))
                .collect(Collectors.toList());

Answer 1

The equivalent is anyMatch . You can use it as below:

List<CustomerResponse> lista = clientes.stream()
    .filter(a -> !posicoes.stream().anyMatch(b -> b.clienteId == a.clienteId))
    .collect(Collectors.toList());

EDIT: Removed the map as it should not be necessary. The original C# code posted in the question does not have a Select either, which would be the equivalent to Java's map .

You can check more details in the official documentation .

You may also use noneMatch , to avoid the negation. Details here .