Podcast
Questions and Answers
The main purpose of using ______ keyword is to differentiate between the formal parameter and data members of class.
The main purpose of using ______ keyword is to differentiate between the formal parameter and data members of class.
this
The ______ is a real copy of a class.
The ______ is a real copy of a class.
object
A class consists of three main members: {Fields, ______, and Constructors}.
A class consists of three main members: {Fields, ______, and Constructors}.
Methods
The ______ keyword can be used to invoke the current class method implicitly.
The ______ keyword can be used to invoke the current class method implicitly.
The ______ keyword can be used to call one constructor within another constructor of the same class.
The ______ keyword can be used to call one constructor within another constructor of the same class.
A class can be referred to as a {blueprint-template- ______ }.
A class can be referred to as a {blueprint-template- ______ }.
Methods and parameters are the primary mechanisms for passing information into and out of an ______.
Methods and parameters are the primary mechanisms for passing information into and out of an ______.
The ______ type, which specifies the type of data the method returns to its caller after performing its task.
The ______ type, which specifies the type of data the method returns to its caller after performing its task.
Variables declared in the body of a particular method are known as ______ variables.
Variables declared in the body of a particular method are known as ______ variables.
The parentheses after the method name indicate that this is a ______.
The parentheses after the method name indicate that this is a ______.
A class provides methods of a special type, known as ______, which are invoked to create a new object.
A class provides methods of a special type, known as ______, which are invoked to create a new object.
The name of the ______ must be identical to its class’s name.
The name of the ______ must be identical to its class’s name.
A class can have multiple ______________________, each with its own unique identity, state, and behavior.
A class can have multiple ______________________, each with its own unique identity, state, and behavior.
The ______________________ of an object is represented by data fields with their current values.
The ______________________ of an object is represented by data fields with their current values.
To invoke a method on an object is to ask the object to perform an ______________________.
To invoke a method on an object is to ask the object to perform an ______________________.
The concept of unique ______________________ refers to the address of an object in memory.
The concept of unique ______________________ refers to the address of an object in memory.
The behavior of an object is defined by its ______________________.
The behavior of an object is defined by its ______________________.
A ______________________ has a data field radius and color.
A ______________________ has a data field radius and color.
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Study Notes
This Keyword
- Used to resolve name conflicts between global variables and local variables
- Can be used to call one constructor within another constructor of the same class
- Can be used to invoke current class methods implicitly
- Can be passed as an argument in method calls
- Can be passed as an argument in constructor calls
- Can be used to return the current class instance
Class and Object
- A class is a blueprint or template
- Class members include fields, methods, and constructors
- An object is a real copy of a class
- Objects have unique identities, states, and behaviors
Methods
- Methods are functions defined inside a class
- Methods can also be called member functions
- A method receives parameters from the caller, performs operations, and returns a result or void to the caller
- Methods and parameters are the primary mechanisms for passing information into and out of an object
- Public methods can be called from methods of other classes in the same package or different package
- Return type specifies the type of data a method returns to its caller
- Variables declared in a method body are local variables and can only be used in that method
- Local variables lose their values when the method terminates
Constructors
- Used to initialize objects
- Basic aim is to place values in the object
- A class provides constructors that are invoked to create a new object and initialize its data fields
- Constructors have the same name as the class
- Access modifiers (specifiers) in Java include private, package private, protected, and public
Java Naming Conventions
- Package names and Java reserved words use small case
- Class names and interface names use Pascal case
- Method names and variable names use camel case
- Constants use capital snake case
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