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Answer 12

Question 13

True or False? The Java documentation describes the general behavior that must be exhibited by each of the methods belonging to an object instantiated from a class that implements the Collection interface. This is sometimes referred to as a contract .

Answer 13

Question 14

True or False? If you define a class that implements the Collection interface in a manner consistent with the Collections Framework , you need not make certain that each of your methods behaves as described in theOracle documentation.

Answer 14

Question 15

True or False? A contract in the Collections Framework defines the behavior of declared methods in a very general way. There is noindication as to how that behavior is to be achieved.

Answer 15

Question 16

True or False? According to a contract of the Set interface, objects that implement the Set interface are allowed to contain duplicate elements.

Answer 16

Question 17

True or False? According to a contract of the Collection interface, objects that implement the Collection are never allowed to contain duplicate elements.

Answer 17

Question 18

True or False? The contract for the add method declared in the List interface, (which extends Collection) , does not prohibit duplicate elements.

Answer 18

Question 19

True or False? The List interface contract prohibits duplicate elements while the Set interface contract does not prohibit duplicate elements.

Answer 19

Question 20

True or False? The classes in the following list are concrete implementation classes in the Java Collections Framework:

  • HashSet
  • TreeSet
  • LinkedList
  • Vector
  • ArrayList
  • HashMap
  • Hashtable
  • WeakHashMap
  • TreeMap

Answer 20

What is the meaning of the following two images?

These images were inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

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This image was also inserted for the purpose of inserting space between the questions and the answers.

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Answer 20


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Answer 19

False. The Set interface contract prohibits duplicate elements while the List interface contract does not prohibit duplicate elements.

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Answer 18


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Answer 17

False. The contract for the add method, as declared in the Collection interface, does not prohibit duplicate elements, but does make the provision for interfaces that extend Collection to prohibit duplicate elements. The contract for the add method in the Set interface does prohibit duplicate elements.

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Answer 16

False. According to a contract of the Set interface, objects that implement the Set interface never contain duplicate elements.

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Answer 15


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Answer 14

False. If you define a class that implements the Collection interface in a manner consistent with the Collections Framework , you must make certain that each of your methods behaves as described in the Oracledocumentation. In other words, you must be careful to comply with the contract defined for those methods. If you don't do that, a user can't rely on objects instantiated from your class to exhibit proper behavior.

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Answer 13


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Answer 12


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Answer 11

False. there is no technical requirement for a specification of the behavior of the interface methods when implemented in a class. In fact, because a methodthat is declared in an interface is abstract, it specifically refrains from defining the behavior of the method. The interface definition simply declaresthe interfaces for all the methods that it declares.

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Answer 10


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Answer 9


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Answer 8

False. An object in Java can often be considered to be of several different types. One of those types is determined by any interfaces implemented by theclass from which the object was instantiated.

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Answer 7


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Answer 6


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Answer 5


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Answer 4


At least three things are included in a collections framework:

  • interfaces
  • implementations
  • algorithms

Variables are not necessarily one of those things.

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Answer 3


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Answer 2


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Answer 1


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Housekeeping material
  • Module name: Java4030r Review
  • File: Java4030r.htm
  • Published: 11/24/13

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Questions & Answers

explain and give four Example hyperbolic function
Lukman Reply
The denominator of a certain fraction is 9 more than the numerator. If 6 is added to both terms of the fraction, the value of the fraction becomes 2/3. Find the original fraction. 2. The sum of the least and greatest of 3 consecutive integers is 60. What are the valu
1. x + 6 2 -------------- = _ x + 9 + 6 3 x + 6 3 ----------- x -- (cross multiply) x + 15 2 3(x + 6) = 2(x + 15) 3x + 18 = 2x + 30 (-2x from both) x + 18 = 30 (-18 from both) x = 12 Test: 12 + 6 18 2 -------------- = --- = --- 12 + 9 + 6 27 3
2. (x) + (x + 2) = 60 2x + 2 = 60 2x = 58 x = 29 29, 30, & 31
on number 2 question How did you got 2x +2
combine like terms. x + x + 2 is same as 2x + 2
Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 1 more than 3 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 113?
mariel Reply
Mark = x,. Don = 3x + 1 x + 3x + 1 = 113 4x = 112, x = 28 Mark = 28, Don = 85, 28 + 85 = 113
how do I set up the problem?
Harshika Reply
what is a solution set?
find the subring of gaussian integers?
hello, I am happy to help!
Shirley Reply
please can go further on polynomials quadratic
hi mam
I need quadratic equation link to Alpa Beta
Abdullahi Reply
find the value of 2x=32
Felix Reply
divide by 2 on each side of the equal sign to solve for x
Want to review on complex number 1.What are complex number 2.How to solve complex number problems.
yes i wantt to review
use the y -intercept and slope to sketch the graph of the equation y=6x
Only Reply
how do we prove the quadratic formular
Seidu Reply
please help me prove quadratic formula
hello, if you have a question about Algebra 2. I may be able to help. I am an Algebra 2 Teacher
Shirley Reply
thank you help me with how to prove the quadratic equation
may God blessed u for that. Please I want u to help me in sets.
what is math number
Tric Reply
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
can you teacch how to solve that🙏
Solve for the first variable in one of the equations, then substitute the result into the other equation. Point For: (6111,4111,−411)(6111,4111,-411) Equation Form: x=6111,y=4111,z=−411x=6111,y=4111,z=-411
x=61/11 y=41/11 z=−4/11 x=61/11 y=41/11 z=-4/11
Need help solving this problem (2/7)^-2
Simone Reply
what is the coefficient of -4×
Mehri Reply
the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
Alfred Reply
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
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