// Populate a List using Set elements.
// Declare and Initialize the Collection
Set<Integer> intSet = new HashSet<Integer>();
Set<Integer> intSet2 = new HashSet<Integer>();
// Add Elements
intSet.add(1);
intSet.add(2);
intSet.add(3);
intSet.add(4);
intSet2.add(1);
intSet2.add(2);
intSet2.add(3);
intSet2.add(4);
// Use the stream and collectors to Summarize all Integer elements
IntSummaryStatistics summary = intSet.stream().collect(Collectors.summarizingInt(p->((Integer)p)));
summary.combine(intSet2.stream().collect(Collectors.summarizingInt(p->((Integer)p))));
System.out.println(summary); // Prints IntSummaryStatistics{count=8, sum=20, min=1, average=2.500000, max=4}
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