Java is a statically typed, object-oriented programming language that is widely used for developing enterprise-level applications. It was first released in 1995 by Sun Microsystems and has since become one of the most popular programming languages in the world. Java code is compiled into bytecode, which can be executed on any platform that has a Java Virtual Machine (JVM) installed.
Classes and Objects
In OOP, a class is a blueprint for creating objects. It defines the properties and methods that an object will have. Once you have defined a class, you can create objects from it. These objects are instances of the class.
Inheritance is a way of creating new classes based on existing classes. The new class inherits all the properties and methods of the existing class. This allows you to reuse code and create more specialized classes.
Encapsulation is the practice of hiding the internal workings of an object from the outside world. This is achieved by making the properties and methods of an object private. Other objects can interact with the object only through its public interface.
One advantage of compiled languages like Java is that they can be optimized for performance. Because the bytecode is pre-compiled, the JVM can optimize the code before it is executed, which can result in faster execution times.
However, one disadvantage of compiled languages is that they can be slower to develop in. Because the code needs to be compiled before it can be executed, there is an additional step in the development process.
Another important concept to understand when it comes to compilation is Just-In-Time (JIT) compilation. JIT compilation is a technique used by some programming languages, including Java, to improve performance. Instead of pre-compiling the code into bytecode, the code is compiled at runtime, just before it is executed.
This allows the runtime environment to optimize the code based on the specific system it is running on. JIT compilation can result in faster execution times, especially for code that is executed frequently.
Runtime refers to the period when a program is running. It is the time when the code is executed and performs its intended function. During runtime, the program interacts with the system hardware and software to accomplish its tasks.
Compiled vs. Interpreted
Static Typing vs. Dynamic Typing