Object-Oriented Programming

In Java, this() is used to call one constructor from another constructor in the same class. It must be the first statement in the constructor body. 'this' alone refers to the current object instance, while 'super' and 'super()' are used for parent class references and constructors respectively.

Let C be classes and M be methods per class. Total = CM. Also Total = (C-2)(M+1). CM = CM + C - 2M - 2 => C - 2M = 2. For C=8, M=3 (Total 24). If C=6, M=4 (Total 24). This fits the condition.

The Bridge pattern is specifically designed to decouple an abstraction from its implementation, allowing both to vary independently. This is useful when you want to avoid a permanent binding between an abstraction and its implementation. Adapter converts interfaces, Composite composes objects into tree structures, and Strategy defines interchangeable algorithms.

The Image2 class acts as a proxy, creating RealImage lazily (only on first use) and then delegating calls. This avoids loading expensive resources until needed and reuses the loaded object for subsequent calls, classic Proxy pattern.

Boolean is the correct wrapper class name for the primitive boolean in Java. Option A is the primitive type (not wrapper), while options B and C are misspelled. Java wrapper classes follow specific capitalization rules.

In Java, the 'java.lang.Object' class is the root of the class hierarchy. Every class in Java, whether user-defined or built-in, inherits from Object either directly or indirectly.

Java does not support multiple inheritance of classes to avoid complexity and the 'diamond problem'. However, it allows a class to implement multiple interfaces, effectively providing a way to achieve the benefits of multiple inheritance.

In Java, static variables are initialized when the class is loaded, and initializer blocks (both static and instance) run before the constructor body. Static blocks run once at load time; instance blocks run every time an object is created, just before the constructor.

Constructors are not inherited in Java - each class must have its own constructors. When a subclass is instantiated, it calls the superclass constructor (implicitly or explicitly via super()), but it does not inherit the constructor itself. Public instance variables, protected members, and primitive elements are all inherited by subclasses.

In Java, a source file can contain multiple classes, but only one can be public. The public class name must match the filename. Non-public classes can have any access modifier, making the original statement false.

Class variables (static variables) can be accessed using the class name (e.g., ClassName.variableName) or via an instance of the class (e.g., instanceName.variableName). While using the class name is preferred for clarity, it is not the 'only' way.

When overriding a method, the overriding method cannot throw broader (checked) exceptions than the overridden method. It can throw the same exceptions, a subset, or subclasses of those exceptions, maintaining the contract established by the parent method.

A final class cannot be subclassed, which means none of its methods can ever be overridden. Since overriding is the primary reason for declaring individual methods as final, all methods in a final class are implicitly final, making this statement true.

A Java class can have only one main method with the signature public static void main(String[] args). This is the entry point that the JVM looks for when executing the class. Overloading main with different parameters is technically possible but only the standard signature serves as the entry point.