Literally Exam 1
Which statement is not True about the Classes?
All classes must include a main() method
The value of a string variable can be surrounded by single quotes
False
Constructors are used to ____________
Initialize a newly created object
Which of the following statement is not true about JAVA?
It is an interpreted language
________________ is used to run the bytecode on each platform.
Java Virtual Machine (JVM)
What is the result of the following code? int num = 6.45;
Error
Java uses _______________ for much of its error handling
Exceptions
Class is the base class (super class) of all classes in java.
False
In JAVA, we can compare int variable with a boolean variable
False
In Java, you declare the type of a variable in your code, and you can change the type of that variable later on.
False
Mutator methods don't change the data of the object
False
String is a mutable class
False
Which statement is not True about local variables?
Local variables can be used in any other method
Which of the following is not an exception type? Error Memory Checked Runtime
Memory
What is the correct way to create an object called myObj of MyClass?
MyClass myObj = new MyClass();
Inheritance
The process by which a new Class is created from another Class
Whenever we create a method, it should be either an accessor or mutator method, not both.
True
Which of the following is true about the public access modifier? Variables, methods and constructors which are declared public can be accessed by any class lying in same package Variables, methods and constructors which are declared public can be accessed by only the accessor methods of that class Variables, methods and constructors which are declared public can be accessed by any class Variables, methods and constructors which are declared public in the superclass can be accessed only by its child class
Variables, methods and constructors which are declared public can be accessed by any class
To declare an array in Java, define the variable type with:
[]
Which of the following statement is True about JAVA exceptions?
finally block always executes
The specialized Classes are said to
inherit the public methods and public and private instance variables of the general Class
A ____________ of a method is any externally observable data modification (state change)
side effect
_______ is a keyword which is used to access the methods or member variables of the parent class
super
_______ refers to the object a method is being called on.
this
Abstraction hides __________?
complexity
If you want your condition to depend upon two conditions BOTH being True, what is the proper notation to put between the two Boolean statements?
&&
A derived Class automatically has all the
instance variables and public methods that the base Class has, and it can have additional methods and/or instance variables as well
How do you create a variable with the numeric value 5?
int x=5;
Why is inheritance advantageous?
it allows Classes to be Reused, without having to copy it into the definitions { } of the derived Classes
We can only construct one object per class
False
Which keyword is used to create a class in Java?
class
Which data structure is used to store the values of functions calls? (Hints: multiple function calls...... function calls another function and it calls another function.....)
Stack
Which of the following statement is not True about JAVA?
The white spaces and the indentation is important
A static variable belongs to the class, not any object of the class
True
Accessor method does not change the internal data of the object on which it is invoked.
True
Which of the following statement is not True? A class depends on another class if its methods use that class in any way We should place code for producing output/consuming input inside the constructor method Always strive to decouple input and output from classes' work We should reduce the dependency as much as possible
We should place code for producing output/consuming input inside the constructor method
Which of the following statement is True? You must initialize the local variables Local variables belongs to the class Instance variables belongs to method Object references are set to zero
You must initialize the local variables
Which statement is used to stop a loop?
break
REVIEW SLIDE 7-14
REVIEW SLIDE 7-14
There is no need to create the object to call the static methods.
True
When the child class declares a method that has the same type arguments as a method declared by its parent class is called as _____________
overriding
Which of the following statement is not True? In order to reduce the dependency, we should decrease the number of attributes We should minimize the dependency as much as possible Abstraction is a technique for structuring computer programs Abstraction reduces things down to the simplest components possible
Answer: In order to reduce the dependency, we should decrease the number of attributes
Java is short for "JavaScript".
False
Two or more methods with the same name in the same class with different arguments is called as ___________
Overloading
Which of the following statements is not True? There can be multiple variables referencing same object A reference is the location in memory that an object resides References are mutable The value of an object variable is a reference
References are mutable
Which of the following statement is not True about JAVA object?
The object can have only one type of data
An immutable class has no mutator methods
True
Do - while loop is guaranteed to run at least one time
True
Every variable in JAVA need a data type
True
Within Java, you need to code your program so that under certain conditions it will skip the current iteration of a for loop. What can be used to accomplish this?
continue
