Section 1
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Overriding a method differs from overloading a method because
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Last updated
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Date created
Mar 1, 2020
Cards (71)
Section 1
(50 cards)
Overriding a method differs from overloading a method because
Overridden methods have the same signature
Which of the following statements is false?
The BigDecimal method format receives a double argument and returns a BigDecimal object that represents the exact value specified.
A string constructor cannot be passed
in Arrays
Which of the following class members should usually be private?
variables or fields
If the superclass contains only abstract method declarations, the superclass is used for
interface inheritance
All of the following methods are implicitly final except:
a method in an abstract class.
Which statement creates the String "JAVA: How to Program"
String 1 = a.concat(b.concat(c))
Assigning a subclass reference to a superclass variable is safe
because the subclass object is an object of its superclass
Which of the following is not a superclass/subclass relationship
Sailboat, Tugboat
Interfaces can have
Any number of methods
Which of the following performs a boxing conversion
Integer x = 7
Superclass methods with this level of access cannot be called
Private
private fields of a superclass can be accessed in a subclass
By calling public or protected methods declared in the superclass
Which class is not a type-wrapper class
Int
Non-abstract classes are called
concrete classes
For String c = "Hello. She sells sea shells"; The Java statements int i = c.indexOf("ll"); int j = c.lastIndexOf("ll"); will result in:
i = 2 and j = 24.
All generic method declarations have a type parameter section delimited by
angle brackets <>
For String c = "Now is the time for all"; The Java statements String i = c.substring(7); String j = c.substring(4, 15); will result in:
i = "the time for all" and j = "is the time "
Interfaces can have ________ methods
Any number of
True or False: The compiler always creates a default constructor for a class
FALSE
All of the following are true for both recursion and iteration except
They both have a base case
Algorithm __________ randomly reorders a list
shuffle
Interface collection contains __________ operations
bulk
Instance variable declared final cannot
be modified after they are initialized
Which of the following could be used to declare abstract method method1 in abstract class Class1 (method1 returns an int and takes no arguments)?
public abstract int method1();
The UML distinguishes interface from other classes by placing the word interface in what above the interface name
guillemets
A _______ class can't be instantiated
abstract
Which statement about hashing is false
A load factor of 1.0 usually results in good hashing performance but less utilization of memory
Given the following declarations: StringBuilder buffer = new StringBuilder("Testing Testing"); buffer.setLength(7); buffer.ensureCapacity(5); Which of the following is true?
buffer has capacity 31
Which of the following is not a word character?
&
Polymorphism enables you to
Program in the general
True or False: Clients are usually involve in a class's implementation
FALSE
Generics provide __________ that allows programmers to catch invalid type
compile type safety
An advantage of inheritance is that
Objects of a subclass can be treated like objects of their superclass
Recursion is often preferable to iteration because
It follows more logically
True or False: References to interface types do not have access to method toString.
FALSE
The statement s1.startsWith("art") has the same result as which of the following?
all of the above
A __________ allows a program to walk through the collection and remove elements from it
Iterator
Which interface is specifically intended to be implemented by classes that can be used with the try-with-resources statement
Auto closable
Consider the String below: String r = "a toyota"; Which of the following will create the String r1 = "a TOYOTa"?
String r1 = r.replace('t','T').replace('o', '0').replace('y', 'Y');
A programmer defined constructor that has no arguments is called a
No argument constructor
When implementing a method, use the class's set and get methods to access the class's ________ data.
private
A recursive method
All of the above
An anonymous String ____
is a string literal
A constructor cannot
Have the same name as its class
To find the character at a certain index position within a string, use the method
charAt with the index
Collections method sort that accepts List as an argument. It sorts the List elements which must implement the ___________ interfaces
comparable
Which of the following statements is true
Both A and A+ will match AAA but only A will match an empty string
When no access modifier is specified for a method or variable, the method or variable:
Has package access
A final field should also be declared ________ if it is initialized in its declaration.
Static
Section 2
(21 cards)