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Can you override a private or static method in Java? You cannot override a private or static method in Java. If you create a similar method with the same return type and same method arguments in child class then it will hide the superclass method; this is known as method hiding.
What you can do is create another private method with the same name in the child class. What is multiple inheritance?
Is it supported by Java? If a child class inherits the property from multiple classes is known as multiple inheritance.
Java does not allow to extend multiple classes. The problem with multiple inheritance is that if multiple parent classes have the same method name, then at runtime it becomes difficult for the compiler to decide which method to execute from the child class.
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The problem is commonly referred to as Diamond Problem. What is encapsulation in Java? Encapsulation is a mechanism where you bind your data variables and code methods together as a single unit.
Here, the data is hidden from the outer world and can be accessed only via current class methods. This helps in protecting the data from any unnecessary modification. We can achieve encapsulation in Java by: Declaring the variables of a class as private. Providing public setter and getter methods to modify and view the values of the variables.
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What is an association? Association is a relationship where all object have their own lifecycle and there is no owner. Multiple students can associate with a single teacher and a single student can associate with multiple teachers but there is no ownership between the objects and both have their own lifecycle.
These relationships can be one to one, one to many, many to one and many to many. What do you mean by aggregation? An aggregation is a specialized form of Association where all object has their own lifecycle but there is ownership and child object can not belong to another parent object.
A single teacher can not belong to multiple departments, but if we delete the department teacher object will not destroy. What is composition in Java? It is a strong type of Aggregation. All these points make Java robust. Architecture-neutral Java is architecture neutral because there are no implementation dependent features, for example, the size of primitive types is fixed. In C programming, int data type occupies 2 bytes of memory for bit architecture and 4 bytes of memory for bit architecture.
However, it occupies 4 bytes of memory for both 32 and bit architectures in Java. Portable Java is portable because it facilitates you to carry the Java bytecode to any platform.
It doesn't require any implementation. High-performance Java is faster than other traditional interpreted programming languages because Java bytecode is "close" to native code.
It is still a little bit slower than a compiled language e. Java is an interpreted language that is why it is slower than compiled languages, e. Distributed Java is distributed because it facilitates users to create distributed applications in Java. This feature of Java makes us able to access files by calling the methods from any machine on the internet. Multi-threaded A thread is like a separate program, executing concurrently.
Abstraction Abstraction is the concept of hiding the internal details and describing things in simple terms. For example, a method that adds two integers.
The internal processing of the method is hidden from the outer world.
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There are many ways to achieve abstraction in object-oriented programmings, such as encapsulation and inheritance. A Java program is also a great example of abstraction. Here java takes care of converting simple statements to machine language and hides the inner implementation details from the outer world.
Encapsulation Encapsulation is the technique used to implement abstraction in object-oriented programming.
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Encapsulation is used for access restriction to class members and methods. Access modifier keywords are used for encapsulation in object oriented programming. For example, encapsulation in java is achieved using private, protected and public keywords.
Polymorphism Polymorphism is the concept where an object behaves differently in different situations. There are two types of polymorphism — compile time polymorphism and runtime polymorphism. Compile time polymorphism is achieved by method overloading.There are exception handling and the type checking mechanism in Java. Here 0 and null values are provided by default constructor.
Security Manager: It determines what resources a class can access such as reading and writing to the local disk.
What is object cloning in Java? Consider the following example. Access modifier keywords are used for encapsulation in object oriented programming. The static variables are stored in the class area, and we do not need to create the object to access such variables.
What are the differences between Get and Post methods? It is a run time polymorphism. We only need to write handlers for events, we wish to handle.
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