1) Using new Keyword : Using new keyword is the most basic way to create an object. This is the most common way to create an object in java. Almost 99% of objects are created in this way. By using this method we can call any constructor we want to call (no argument or parameterized constructors).

Encapsulation is a method used to restrict access to fields in a class. It also is a way to reduce the amount of code necessary. Encapsulation can be achieved with a couple different methods. One being inheritance the other being properties. You just studied 5 terms!

The main advantage of using encapsulation is the security of the data. Benefits of encapsulation include: Encapsulation protects an object from unwanted access by clients. Encapsulation allows access to a level without revealing the complex details below that level.

The private modifier specifies that the member can only be accessed in its own class. The protected modifier specifies that the member can only be accessed within its own package (as with package-private) and, in addition, by a subclass of its class in another package.

The answer is No, you cannot override the same method in one class. The anonymous inner class is a different class.

One of the important property of java constructor is that it can not be static. A constructor is called when an object of a class is created, so no use of the static constructor. Another thing is that if we will declare static constructor then we can not access/call the constructor from a subclass.

What is Private Constructor? If a class has one or more private constructor and no public constructor then other classes are not allowed to create instance of this class; this means you can neither create the object of the class nor can it be inherited by other classes.

one default constructor

Yes! Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters.

A class can have any number of constructors. If a class have more than one constructor, we call it as the constructor is overloaded.

I am new to java singleton, I want to make my class singleton, so that I have one instance of it in my code. The class which I want to be singleton is extend another class which its constructor have two entries, and entries are also singleton!……or Join us.

this() and super(), both are the constructors that’s why must be the first statement. But we can use both in a program. this(): It is used to call, same class Default or Parametrized Constructor. super(): It is used to call, immediate super/parent class Default or Parametrized Constructor.

The following are some key points: A Sealed class is created by using the sealed keyword. The Access modifiers are not applied upon the sealed class. To access the members of the sealed we need to create the object of that class.

Why Sealed Classes?

1. Sealed class is used to stop a class to be inherited.
2. Sealed method is implemented so that no other class can overthrow it and implement its own method.
3. The main purpose of the sealed class is to withdraw the inheritance attribute from the user so that they can’t attain a class from a sealed class.

Once a class is defined as a sealed class, the class cannot be inherited. In C#, the sealed modifier is used to define a class as sealed. In Visual Basic . NET the NotInheritable keyword serves the purpose of sealed.

Why singleton class is always sealed in C#? The sealed keyword means that the class cannot be inherited from. Marking the class sealed prevents someone from trivially working around your carefully-constructed singleton class because it keeps someone from inheriting from the class.

In singleton class, we use private constructor so that any target class could not instantiate our class directly by calling constructor, however, the object of our singleton class is provided to the target class by calling a static method in which the logic to provide only one object of singleton class is written/ …

Static classes are loaded automatically by the . NET Framework common language runtime (CLR) when the program or namespace containing the class is loaded. A sealed class cannot be used as a base class. Sealed classes are primarily used to prevent derivation.

Unlike static classes, Singleton classes can be inherited, can have base class, can be serialized and can implement interfaces. You can implement Dispose method in your Singleton class.

The private members of a class can be inherited but cannot be accessed directly by its derived classes. They can be accessed using public or protected methods of the base class. The inheritance mode specifies how the protected and public data members are accessible by the derived classes.

Explanation: If only one base class is used to derive only one subclass, it is known as single level inheritance. The reason of this name is that we inherit the base class to one more level and stop the inheritance any further.