Cs121 Final Questions And Correct Answers

CS121 FINAL QUESTIONS AND CORRECT ANSWERS


A nonlinear collection in which there is essentially no inherent organization to the
elements in the collect - Answers - Set

The difference between a set and map is that a set stores the key and the data _____
while a map separates the key from the data and only stores the key and a reference to
the data - Answers - Together

Which data structure does not keep its elements in any type of order - Answers - set

What happens when we try to add an element to a set in which the element is already
present - Answers - it is not added

Which data structures can be used to implement a set from Java API - Answers -
Hashtable and balanced binary tree

To use a treeset, your objects must belong to a class that implements the ____
interface - Answers - Comparable

Which java code is not correct - Answers - hashset<String> cats = new
treeset<String>();

In our lab 13, a set was implemented by using a linked node (list), then what complexity
would testing for containment have? - Answers - O(n)

Do not use PC. What is the correct answer on the console window?



Set<String> myset1 = new treeset<String>();

Myset1.add("X");

Myset1.add("Y");

Myset1.add("X");

Myset1.add("Z");

Set<String> myset2 = new treeset<String>();

Myset2.add("Y");

, Myset2.add("Z");

Myset2.add("W");

Myset2.add("Y");

Set<String> set3 = new treeset<String>(myset1);

Set3.retainall(myset2);

System.out.println(set3); - Answers - [Y, Z]

Do not use PC. What is the correct answer on the console window?

Set<String> myset1 = new treeset<String>();

Myset1.add("X");

Myset1.add("Y");

Myset1.add("X");

Myset1.add("Z");

Set<String> myset2 = new treeset<String>();

Myset2.add("Y");

Myset2.add("Z");

Myset2.add("W");

Myset2.add("Y");

Set<String> set3 = new treeset<String>(myset1);

Set3.removeall(myset2);

System.out.println(set3); - Answers - [X]

Do not use PC. What is the correct answer on the console window?

Set<String> myset1 = new hashset<String>();

Myset1.add("X");