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What is a class?
A blueprint for creating objects, defining their attributes and behaviors.
What are instance variables?
Variables that characterize objects within a class.
What is a constructor?
A special method used to create objects of a class.
What is a method?
A function associated with an object, defining its behavior.
What is encapsulation?
Bundling of data and methods that operate on that data, and restricting access from outside.
What is a client in the context of a class?
Other users and classes that interact with a class and its objects.
What is a class header?
The first line of a class definition, specifying the class name and visibility.
What is a class body?
The code block enclosed in curly braces that contains variable declarations and methods.
What is a default constructor?
A constructor with no parameters, providing default values for instance variables.
What is an overloaded constructor?
A constructor with the same name as another constructor but with different parameters.
What is the main purpose of a class in Java?
To define the structure and behavior of objects.
Why are instance variables often declared as private?
To enforce encapsulation and protect data integrity.
What is the role of a constructor in object creation?
To initialize the object's state by assigning initial values to its instance variables.
How does encapsulation contribute to code maintainability?
By hiding internal implementation details and preventing unintended modifications from outside the class.
What is the significance of the 'new' keyword in Java?
It is used to create a new instance (object) of a class.
Explain the concept of information hiding.
Restricting access to certain components of a class to prevent improper access or modification.
What is the purpose of a getter method?
A method used to access the value of a private instance variable.
What is the purpose of a setter method?
A method used to modify the value of a private instance variable.
What is the role of the main method?
It is the entry point for the program.
What are the three main parts of a class?
Variable declarations, constructors, and methods.
What are the general steps to writing a class in Java?
1. Define the class header. 2. Declare instance variables. 3. Define constructors. 4. Define methods.
What are the steps to create a new object from a class?
1. Declare a variable of the class type. 2. Use the `new` keyword followed by the class constructor to create the object. 3. Assign the newly created object to the variable.
What are the steps to access an instance variable of an object?
1. Ensure the instance variable has appropriate access (e.g., public or via getter method). 2. Use the dot operator (`.`) to access the variable (e.g., `objectName.variableName` or `objectName.getVariableName()`).
What are the steps to call a method on an object?
1. Use the dot operator (`.`) followed by the method name and parentheses (e.g., `objectName.methodName()`). 2. Pass any required arguments inside the parentheses.
What are the steps to define a constructor?
1. Use the `public` keyword. 2. Use the same name as the class. 3. Define parameters (if any) inside parentheses. 4. Write the constructor body to initialize instance variables.
What are the steps to define a method?
1. Specify the access modifier (e.g., `public`, `private`). 2. Specify the return type (or `void` if no return value). 3. Give the method a name. 4. Define parameters (if any) inside parentheses. 5. Write the method body.
What are the steps to implement encapsulation?
1. Declare instance variables as `private`. 2. Provide `public` getter methods to access the values of the instance variables. 3. Provide `public` setter methods to modify the values of the instance variables (if needed).
What are the steps to overload a constructor?
1. Create multiple constructors with the same name as the class. 2. Ensure each constructor has a different parameter list (different number or types of parameters).
What are the steps to determine instance variables?
1. Identify the characteristics or attributes of the class. 2. For each characteristic, determine an appropriate data type. 3. Declare the instance variables with the chosen data types.
What are the steps to determine methods?
1. Identify the actions or behaviors that objects of the class should perform. 2. Determine the inputs (parameters) required for each action. 3. Determine the output (return type) of each action. 4. Implement the methods to perform the actions.