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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. Child object does not have their lifecycle and if parent object deletes all child object will also be deleted. House can contain multiple rooms there is no independent life of room and any room can not belongs to two different houses if we delete the house room will automatically delete.
What is a marker interface? A Marker interface can be defined as the interface having no data member and member functions. In simpler terms, an empty interface is called the Marker interface.
The most common examples of Marker interface in Java are Serializable, Cloneable etc. The marker interface can be declared as follows. What is object cloning in Java?
Object cloning in Java is the process of creating an exact copy of an object. It basically means the ability to create an object with a similar state as the original object.
This method creates a new instance of the class of the current object and then initializes all its fields with the exact same contents of corresponding fields.
To object clone , the marker interface java. Cloneable must be implemented to avoid any runtime exceptions. One thing you must note is Object clone is a protected method, thus you need to override it. What is a copy constructor in Java? Copy constructor is a member function that is used to initialize an object using another object of the same class. Though there is no need for copy constructor in Java since all objects are passed by reference. Moreover, Java does not even support automatic pass-by-value.
According to Sun, 3 billion devices run Java. There are many devices where Java is currently used. Some of them are as follows:.
Standalone applications are also known as desktop applications or window-based applications. These are traditional software that we need to install on every machine. Examples of standalone application are Media player, antivirus, etc. AWT and Swing are used in Java for creating standalone applications.
An application that runs on the server side and creates a dynamic page is called a web application. An application that is distributed in nature, such as banking applications, etc. It has advantages of the high-level security, load balancing, and clustering. In Java, EJB is used for creating enterprise applications.
An application which is created for mobile devices is called a mobile application.
Currently, Android and Java ME are used for creating mobile applications. It is a Java programming platform. It includes Java programming APIs such as java. It is an enterprise platform which is mainly used to develop web and enterprise applications. It is built on the top of the Java SE platform. We assure that you will not find any problem in this Java tutorial.
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. We can write Java programs that deal with many tasks at once by defining multiple threads.
The main advantage of multi-threading is that it doesn't occupy memory for each thread. It shares a common memory area. Threads are important for multi-media, Web applications, etc. Dynamic Java is a dynamic language.