Java – What is OOP? OOP stands for Object-Oriented Programming. Procedural programming is about writing procedures or methods that perform operations on the data, while object-oriented programming is about creating objects that contain both data and methods.
Indeed, What is array in Java?
An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed.
Then, What is constructor in Java? A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created.
What is Fullform of Java? There is no Full form of JAVA as such. JAVA is a general-purpose programming language that is object-oriented, class-based, and designed to have as few implementation dependencies as possible.
In the same way What are the two types of Java? Answer. There are two types of Java programs — Java Stand-Alone Applications and Java Applets. Java applets are Java applications that run within a web browser. They are mainly used for internet programming.
What is a vector in Java?
Answer: In Java, a Vector can be defined as a growable array of objects. Similar to arrays, Vector elements can also be accessed using indices.
What is thread in Java?
A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. Every thread has a priority. Threads with higher priority are executed in preference to threads with lower priority.
What is abstraction in Java?
In Java, Data Abstraction is defined as the process of reducing the object to its essence so that only the necessary characteristics are exposed to the users. Abstraction defines an object in terms of its properties (attributes), behavior (methods), and interfaces (means of communicating with other objects).
What is overloading in Java?
In Java, two or more methods may have the same name if they differ in parameters (different number of parameters, different types of parameters, or both). These methods are called overloaded methods and this feature is called method overloading.
What is super keyword in Java?
The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.
What was the first name of Java?
The language was initially called Oak after an oak tree that stood outside Gosling’s office. Later the project went by the name Green and was finally renamed Java, from Java coffee, a type of coffee from Indonesia.
Why is Java called Oak?
Oak is a discontinued programming language created by James Gosling in 1989, initially for Sun Microsystems’ set-top box project. The language later evolved to become Java. The name Oak was used by Gosling after an oak tree that stood outside his office.
Why Java is called simple?
Simple and Familiar
Java is simple because: Its coding style is very clean and easy to understand. It removes complexity because it doesn’t use complex and difficult features of other languages like C and C++, which are as follows: Concept of Explicit Pointers.
What type of language is Java?
The Java™ Programming Language is a general-purpose, concurrent, strongly typed, class-based object-oriented language. It is normally compiled to the bytecode instruction set and binary format defined in the Java Virtual Machine Specification.
What is the four version of Java?
There are four platforms of the Java programming language: Java Platform, Standard Edition (Java SE) Java Platform, Enterprise Edition (Java EE) Java Platform, Micro Edition (Java ME)
What is difference between Java and JavaScript?
According to the Java platform official website, the main difference between Java and JavaScript is that Java is an OOP programming language while JavaScript is an OOP programming script. JavaScript code is written completely in text and need only be interpreted. Java, on the other hand, must be compiled.
What is pair in Java?
Java Pair class stores value in the key-value pair combination. It is useful for getting two values. This key-value combination is known as tuples. The pairs are useful when we want two values to be returned from a method.
What is a Hashtable in Java?
A Hashtable is an array of a list. Each list is known as a bucket. The position of the bucket is identified by calling the hashcode() method. A Hashtable contains values based on the key. Java Hashtable class contains unique elements.
What is enumeration in Java?
Java Enums can be thought of as classes which have a fixed set of constants (a variable that does not change). The Java enum constants are static and final implicitly. It is available since JDK 1.5. Enums are used to create our own data type like classes.
What is deadlock in Java?
Deadlock occurs when multiple threads need the same locks but obtain them in different order. A Java multithreaded program may suffer from the deadlock condition because the synchronized keyword causes the executing thread to block while waiting for the lock, or monitor, associated with the specified object.
What is multitasking in Java?
Multitasking is a process of executing multiple tasks simultaneously. We use multitasking to utilize the CPU. Multitasking can be achieved in two ways: Process-based Multitasking (Multiprocessing)
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