System.out.println("--- DoubleStream ---");	
	DoubleStream doubleStream = DoubleStream.of(123.56, 456.87, 789.65);
	doubleStream.forEach(e -> System.out.println(e));	
	
	System.out.println("--- DoubleStream.generate() ---");
	DoubleStream doubleStream = DoubleStream.generate(() -> new Random().nextDouble()).limit(5);
	doubleStream.forEach(v -> System.out.println(v));