a) What is the output of the following program segment? Stringstr="Javaisgood!";System.out.println(str.tolowerCase()-replace(a,i)-replace(v,n)); [2] b) What is the output of the following program segment? Set aSet = new HashSet(); Iterator iterator = aSet.iterator(); aSet.add("Java"); aSet. add("Java"); aSet.add("course"); System. out.println(aSet); System.out.println(iterator. hasNext())