// Given `intList` with the following elements: 5, 4, 1, 3, 7, 8 List<Integer> evenList = new ArrayList<>(); for(Integer i: intList) { if(i % 2 == 0) { evenList.add(i*2); } } // evenList will have elements 8, 16 /*A Stream is a sequence of elements created from a Collection source. A Stream can be used as input to a pipeline, which defines a set of aggregate operations (methods that apply transformations to a Stream of data). The output of an aggregate operation serves as the input of the next operation (these are known as intermediate operations) until we reach a terminal operation, which is the final operation in a pipeline that produces some non Stream output.*/ List<Integer> evenList = intList.stream() .filter((number) -> {return number % 2 == 0;}) .map( evenNum -> evenNum*2) .collect(Collectors.toList());
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