Writing Classes in AP Computer Science A

Different from the class name to avoid confusion.

Preceded by 'new' to indicate object creation.

The same as any method name.

The same as the class name.

Constructors defined statically would allow direct invocation via classname negatively impacting encapsulation principles.

Declaring constructors statically would lead to objects sharing a single state defined by said static constructor, resembling singleton pattern.

You cannot declare constructors as static methods therefore such declaration would result in compilation failure.

Static constructors could provide global access for object creation bypassing traditional per-instance construction mechanisms.

The object will be created with default values regardless of any parameters passed.

A compile-time error occurs because Java is case-sensitive and treats it as a method rather than a constructor.

The object will be created successfully because Java ignores capitalization in identifiers.

A run-time exception occurs due to invalid syntax for naming constructors.

Graph(List edges)

Graph(String serializedGraph)

Graph(int[][] adjacencyMatrix)

Graph()

Having only one constructor makes it easier to understand how to create instances of the class since there are no alternatives.

This approach ensures all required values are set upon object construction avoiding any possible need for additional setter methods or field mutations afterwards.

It complicates creation of instances requiring all data upfront which might not always be available or lead to error-prone code.

Providing just one way to create objects reduces chances of incorrect instantiation by eliminating ambiguity in how to use class correctly making overall design cleaner and more intuitive.

When 'this()' refers to an overloaded constructor that doesn't exist within the subclass itself.

If 'this()' correctly calls another overloaded, accessible constructor within the same class hierarchy.

When both superclass and subclass have accessible no-argument constructors defined explicitly.

If 'super()' calls parent class's default no-arg constructor which indeed exists and is accessible.

The code will fail to compile due to duplicate method signatures.

Both constructors get merged automatically by the compiler.

An exception is thrown at runtime when an object is instantiated.

The second constructor overwrites the first one.

Student s = new Student();

new Student();

Class Student = new Class();

Create(Student);

The program runs but generates an exception at runtime.

The class reverts to using the default no-argument constructor provided by Java.

An object is created using default values for all fields.

Compilation fails due to the absence of a no-argument constructor.

2. Empty constructor

Default constructor

3. Base constructor

1. Nullary constructor