Section 1
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When is a for loop useful?
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Date created
Mar 1, 2020
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Section 1
(50 cards)
When is a for loop useful?
when you know how many times a task is to be repeated.
what is an if/else if statement?
An if statement that is followed by an optional else if statement, which will possibly execute when the first boolean expression is false.
Can interface extend multiple times?
yes
What is the keyword that would be used to extend an interface?
extends
What is a interface?
is a collection of abstract methods
What is an if statement?
A conditional statement that uses if logic. If true or if false, do x, else do something else or nothing.
Name the three parts of an for loop?
initialization, Boolean expression, and the body
What is a switch statement?
is a statement that allows a variable to be tested for equality against a list of values.
What is the while loop?
a statement in Java that repeatedly executes a target statement as long as a given condition is true.
What are the three categories of exceptions?
Checked exceptions, unchecked exceptions, and errors.
What is the keyword that is used to declare an interface?
interface
What does the expression variable do?
it evaluates to the array you need to loop through and can be an array variable or a method call.
What are the three types of loop constructs?
While loop, for loop, do..while loop
what keyword would you use for catching exceptions?
try and catch
What is the static keyword used mainly for ?
for memory management
What is an exception?
an object that wraps an error event that occurred within a method and contains info about the error and the state of the program when the error happened.
Describe Unchecked Exceptions?
are exceptions in which the compiler does not enforce that you handle them explicitly. such as you not throwing them.
What is an nested IF Statement?
putting a if or else statement inside another if or else statement
What are the 3 important rules to remember about Interfaces?
A class can implement more than one interface at a time. A class can extend only one class but implement many interfaces. An interface can extend another interface similar to how a class can extend another class.
What is a string?
A sequence of characters
What are some similarities between an interface and a class?
both can contain any number of methods. can be written in a file with a .java extension. the byte code of an interface appears in a .class file.
How does one access a package from other packages?
by importing package.*; import package.classname; fully qualified name.
Describe the usage of the "this" keyword?
is a reference variable that refers to the current object.
Does a finally block of code always execute?
yes
What are exceptions?
they are events that occur during the execution of programs that disrupt the normal flow of instructions.
What is the declaration variable?
a newly declared block variable that is of a type compatible with the elements of the array you are accessing.
What are some difference between an interface and a class?
an interface cannot be instantiate. it does not contain any constructors. all the methods in an interface are abstract. they cannot contain instance fields. cannot be extended by a class only implemented. an interface can extend multiple interfaces.
What is a package?
a group of similar type of classes interfaces and sub-packages.
Describe Errors ?
are not exceptions but are problems that arise beyond the control of the user or programmer
What are the forms that a static can be ?
it can be a variable, a method, a block, and a nested class.
What is the for loop?
a repetition control structure that allows you to efficiently write a loop that needs to be executed a specific number of times.
What are the three advantages of Packages?
They are used to categorize classes and interfaces so they can be easily maintained. They provide access protection. They remove naming collision.
Give an example of an exception?
dividing by zero.
Describe what the final keyword is used for?
it used to restrict the user.
List two types of unchecked exceptions?
Errors and Run-time Exceptions
When would you use a the throw/throws keyword ?
when a method does not handle a checked exception.
What does the String Class do ?
it creates and manipulates strings.
How many usages are there for the "this" keyword?
six
When is a finally block initiated ?
after a try or a catch block.
What is an if/else statement?
a if statement that is followed by an optional else statement, which will execute when the Boolean expression is false.
What is an accessor method?
a method that is used to obtain information about an object.
what is the advantage of using a static variable ?
it makes your program memory efficient
What does the child interface inherit from the parent interface?
the methods of the parent interface
Describe the difference between a do..while loop and a while loop?
a do..while loop is guaranteed to execute at least one time.
Describe the initialization step?
this step allows you to declare and initialize any loop control variables and ends with a semi colon(;)
What are the forms that the final keyword can be in ?
it can be a variable, method, or class
Describe Checked Exceptions?
are exceptions that the compiler enforces that you handle them explicitly. such as declaring that checked exceptions must throw them.
What is another name for a final variable that has no value?
blank final variable.
What is the static variable can be used for?
it can be used to refer to the common property of all objects.
what is an example of how a static variable can be used ?
college name of students.
Section 2
(20 cards)