Practice More Questions From: Quiz 8 : More with Collections/Maps & Regular Expressions
Q:
Which of the following declarations is correct for a list that is expected to contain integers?
Q:
What’s the result of the following code? ArrayList list = new ArrayList(); list.add(“A”); list.add(“B”); list.add(0, “D”); list.add(“C”); System.out.print(list.get(0)); System.out.print(list.get(2));
Q:
What’s the result of the following code? public static void main(String[] args) { Map map = new HashMap(); map.put(“a”, 100); map.put(“b”, 200); map.put(“c”, 300); map.put(“d”, 400); // Gets EntrySet view of keys and values Set<Map.Entry> mapSet = map.entrySet(); for (Map.Entry entrance : mapSet) { System.out.print(entrance.getKey() + “:”); System.out.println(entrance.getValue()); } }
Q:
Which of the following matches “one letter or underscore followed by one or more letters, digits, and/or underscores” using a regular expression in Java?
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