If you include even one constructor in your class, Java will ______.
Answer: not provide this default constructor
If you include even one constructor in your class, Java will ______.
Answer: not provide this default constructor
Answer: not provide this default constructor
True or false. If you do not include any constructors in your class, Java will automatically create a default or no-argument constructor that takes no arguments, performs no initializations, but allows the object to be created.
True or false. If you do not include any constructors in your class, Java will automatically create a default or no-argument constructor that takes no arguments, performs no initializations, but allows the object to be created.
Answer: True
The first action taken by a constructor is to_________.
The first action taken by a constructor is to_________.
Answer: create an object with instance variables
A constructor is called when _________.
A constructor is called when _________.
Answer: an object of the class is created using new.ClassName objectName = new ClassName(anyArgs);
Constructors are typically _____.
Constructors are typically _____.
Answer: overloaded
A constructor has no ____ returned, not even void.
A constructor has no ____ returned, not even void.
Answer: type
A constructor must have the same name as the ______.
A constructor must have the same name as the ______.
Answer: class
True or False. The signature of a method does include the type returned.
True or False. The signature of a method does include the type returned.
Answer: False. The signature of a method does not include the type returned
The signature of a method only includes the ____ and its parameter types.
The signature of a method only includes the ____ and its parameter types.
Answer: method name
You can not Overload based on the _____.
You can not Overload based on the _____.
Answer: Return Type
Ambiguous method invocations will produce an ____in Java
Ambiguous method invocations will produce an ____in Java
Answer: error
In some cases of overloading, because of automatic type conversion, a ______ can be resolved in multiple ways.
In some cases of overloading, because of automatic type conversion, a ______ can be resolved in multiple ways.
Answer: single method invocation
The _____ of overloading and automatic type conversion can have unintended results.
The _____ of overloading and automatic type conversion can have unintended results.
Answer: interaction
True or false. If Java cannot find a method signature that exactly matches a method invocation, it will try to use automatic type conversion.
True or false. If Java cannot find a method signature that exactly matches a method invocation, it will try to use automatic type conversion.
Answer: True
Differing signatures must have different numbers and/or types of _____.
Differing signatures must have different numbers and/or types of _____.
Answer: parameters
A _____ consists of the name of a method together with its parameter list.
A _____ consists of the name of a method together with its parameter list.
Answer: signature
For overloading To be valid, any two definitions of the method name must have _____ signatures.
For overloading To be valid, any two definitions of the method name must have _____ signatures.
Answer: different
If a mutator validates the argument, then, have it return a ______value, and have the calling program handle the invalid inputs.
If a mutator validates the argument, then, have it return a ______value, and have the calling program handle the invalid inputs.
Answer: boolean
An alternative approach to a mutator method issuing an error message when invalid argument is used is to_______.
An alternative approach to a mutator method issuing an error message when invalid argument is used is to_______.
Answer: is to have the mutator validate the arguments
Some ____methods issue an error message when invalid arguments are used.
Some ____methods issue an error message when invalid arguments are used.
Answer: mutator
True or False. A Class Has Access to Private Members of All Objects of the Class.
True or False. A Class Has Access to Private Members of All Objects of the Class.
Answer: True
The name of a mutator method typically starts with the word ___.
The name of a mutator method typically starts with the word ___.
Answer: set
_____ methods allow the programmer to change the value of an object's instance variables in a controlled manner.
_____ methods allow the programmer to change the value of an object's instance variables in a controlled manner.
Answer: Mutator
The name of an accessor method typically starts with the word _______.
The name of an accessor method typically starts with the word _______.
Answer: get
_____ methods allow the programmer to obtain the value of an object's instance variables.
_____ methods allow the programmer to obtain the value of an object's instance variables.
Answer: Accessor
Usually, methods are ____only if used as helping methods for other methods in the class.
Usually, methods are ____only if used as helping methods for other methods in the class.
Answer: private
Most methods are ____, and thus provide controlled access to the object
Most methods are ____, and thus provide controlled access to the object
Answer: public
It is considered good programming practice to make all instance variables ____.
It is considered good programming practice to make all instance variables ____.
Answer: private
The modifier ____ means that an instance variable or method cannot be accessed by name outside of the class.
The modifier ____ means that an instance variable or method cannot be accessed by name outside of the class.
Answer: private
The new operator:
The new operator:
Answer: allocates memory for the object.; is used to create an object of a class.; associates an object with a variable that names it.; All of the above.
A method that performs some action but does not return a value is called a __________ method.
A method that performs some action but does not return a value is called a __________ method.
Answer: void
A variable whose access is confined to an object (instance) of a class is called:
A variable whose access is confined to an object (instance) of a class is called:
Answer: An instance variable
The purpose of the toString method is to return a ____ value that represents the data in the object.
The purpose of the toString method is to return a ____ value that represents the data in the object.
Answer: String -- public String toString()
True or false. You can use == to compare objects.
True or false. You can use == to compare objects.
Answer: False, You cannot use == to compare objects
True or False. The purpose of equals, a boolean valued method, is to compare two objects of the class to see if they satisfy the notion of "being equal"
True or False. The purpose of equals, a boolean valued method, is to compare two objects of the class to see if they satisfy the notion of "being equal"
Answer: True
When a method is invoked, the calling object is automatically plugged in for ____.
When a method is invoked, the calling object is automatically plugged in for ____.
Answer: this
Even though this parameter does not appear on the parameter list of a method, it is still a _____.
Even though this parameter does not appear on the parameter list of a method, it is still a _____.
Answer: parameter
The this parameter is a kind of ____ parameter.
The this parameter is a kind of ____ parameter.
Answer: hidden
If this Parameter is not used as the variable with the same name is used in the method, all instances of the variable name will be interpreted as a _____.
If this Parameter is not used as the variable with the same name is used in the method, all instances of the variable name will be interpreted as a _____.
Answer: local
_____must be used if a parameter or other local variable with the same name is used in the method.
_____must be used if a parameter or other local variable with the same name is used in the method.
Answer: this
Parameter is the ____ and argument is the item passed in.
Parameter is the ____ and argument is the item passed in.
Answer: variable
Arguments in Java are passed by_____, and so the _____ of the argument will not be changed by the method.
Arguments in Java are passed by_____, and so the _____ of the argument will not be changed by the method.
Answer: value and value
Reminder. A primitive argument can be ____type cast from any of the following types, to any of the types that appear to its right:
Reminder. A primitive argument can be ____type cast from any of the following types, to any of the types that appear to its right:
Answer: automatically
If a parameter is a double, and the argument is an int the value of the argument would be cast to a____.
If a parameter is a double, and the argument is an int the value of the argument would be cast to a____.
Answer: double
In a Parameter, If argument and parameter types do not match exactly, Java will attempt to make _____.
In a Parameter, If argument and parameter types do not match exactly, Java will attempt to make _____.
Answer: an automatic type conversion
True or false. The number and order of the arguments does not need to match that of the parameter list.
True or false. The number and order of the arguments does not need to match that of the parameter list.
Answer: False. The number and order of the arguments must exactly match that of the parameter list
Subscribe to:
Comments (Atom)