Java.util.Stack is a subclass of___. A. java.util.ArrayList B. java.util. Linked

Question

Java.util.Stack is a subclass of___. A. java.util.ArrayList B. java.util. LinkedList C. java.util.AbstractList D. java.util.Vector E. java util. List The keys must be unique for Map. True False Which of the following is correct to perform the set union of two sets 1 and s2? A. s1.union(s2) B. s1 + s2 C. s1. addAll(s2) D. s1.add(s2) Which of the following is correct to perform the set difference of two sets s1 and s2? A. s1 difference (s2) B. s1 - s2 C. s1.subtract(s2) D. s1.removeAll(s2) The Map is the base interface for___ A. TreeMap B. HashMap C. LinkedHashMap D. ArrayList E. LinkedList

Explanation / Answer

27 --> java.util.Stack is a subclass of java.util.Vector

Brief explanation - Stack implements standard last-in, first-out which is a subclass of Vector. Stack only defines the default constructor, which creates an empty stack. Stack includes all the methods defined by Vector, and also adds several of its own.

28 --> The key must be unique for Map -> True (Map does not allow duplication like Set.)

29 --> C. s1.addAll(s2) [The union of two sets is the set containing all of the elements contained in either set.]

30 --> D. s1.removeAll(s2) [Exmp - The set difference of s1 minus(-) s2 is the set containing all of the elements found in s1 but not in s2.]

31 --> A,B,C [The Java platform contains three Map implementations: HashMap, TreeMap, and LinkedHashMap. ]

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