AY19/20 SS1 qn 7

[muhdjabir]

Source

AY19/20 SS1

Description

Hi Everyone, I am abit weak in streams, how would you go about coding this out?

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[tzk00]

Hi, what I did was I first created a stream of integers from 1 to n. I then map each integer to a point which I will then pass as an argument to a circle. The two points of the circle always add up to n + 1. So the rough idea to create a circle would be new Circle (new Point(x, n + 1 - x)) where x refers to each integer in the stream. I am not sure if this is the correct method but I could only think of this.

[MaxYongSK]

I did this which is the same as what @tzk00 did I think

List< Circle > getCircles(int n) {
return Stream.iterate(1, x -> x <= n, x -> x + 1).map(x -> new Circle(new Point(x, n + 1 - x)))
.collect(Collectors.toList());
}

[calvinseptyanto]

List getCircles(int n) {
return Stream.iterate(1.0, x -> x + 1)
.limit(n)
.map(x -> new Circle(new Point(x, n + 1 - x)))
.collect(Collectors.toList());
}

[Lu-Yi-Fan]

List getCircles(int n) {
return Stream.iterate(1, i-> i < n +1, i -> i + 1).map(x -> new Circle( new Point((double) x,(double) (n+ 1 - x)))).collect(Collectors.toList());
}