Can you name two main types of operations implemented using Stream API?

Two main types of operations in Java Stream API:

1. Intermediate operations — return a new stream and allow chaining of operations. They are lazy, meaning they do not execute until a terminal operation is invoked. Examples: filter(), map(), sorted(), distinct().

2. Terminal operations — terminate the chain and return a result (such as a collection, a number, or void). After a terminal operation, the stream is considered consumed. Examples: collect(), forEach(), reduce(), count().

Example:

List<String> names = Arrays.asList("Anna", "Bob", "Charlie");
long count = names.stream()
    .filter(name -> name.startsWith("A"))  // intermediate operation
    .count();                              // terminal operation

Here, filter is an intermediate operation, and count is a terminal operation.