How Does Java Programming Language Work?

We need to know how a programming language works before we can study it. Here we will be reading about the execution of a java program in detail and we will also understand what happens when we compile and execute a java program.
Due to its intriguing features, Java is a popular high-end programming language. We cant run Java programs on a normal machine this is because high-level programming languages need to be translated into machine code first, due to this we run them on a Java compiler. It makes it easier for the machine to comprehend the Java language by translating it into machine language. It is stated that the language is platform-independent and does not support simple one-step compilation. Now the first thing that we need to understand is how does the java programming language work?
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The working of the Java programming language can be summed up in three steps. Follow these steps: How Does the Java Programming Language Work? Here for the first step, we need to have a java source code otherwise we won’t be able to run the program you need to save it with the program.java extension.
Secondly, we need to use a compiler so that it compiles the source code which in turn gives out the java bytecode and that needs to have a program.class extension. The Java bytecode is a redesigned version of the Java source codes that can run on any machine, regardless of which one it was built on. Later on, we put the java bytecode through the Java Virtual Machine which is an interpreter that reads all the statements thoroughly step by step from the java bytecode which will further convert it to the machine-level language so that the machine can execute the code. After the conversion is complete, we do not receive the output. So knowing about the working of java we need to understand the execution process of the program written in the language.
The Java program’s execution procedure The computer does not understand our human languages and it only understands codes that are in binary or coded form that means 0 or 1. During programming, there are a lot of steps that it undergoes-
Creation of a Java Program-When we talk about creating a program or typing a code that solves any kind of problem that we may have, it means physically writing the program on any text editor. You may or may not edit the program after you have written it once. When you create a program you don’t just make it and let it be the way it is you can modify it and save it on the device. But you need to save it with the java extension otherwise it would just appear as a normal text file.
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Creation of a Java program
Compiling a Java Program-Now once the program is created and does not have any errors or mistakes we can go ahead and compile the program when you compile a program it means the compiler compiles the program and if there are no errors after compiling the program we can further run it and get the desired output. We compile the Java program in a command prompt or another console.
Compiling a Java program 3. Java Virtual Machine (JVM) uses a lot of memory to load the program into memory before it can be executed. This is because JVM needs to load the.class file extension. Loading is the process of placing a program in memory for it to run. The .class files are needed by the program to execute the file.
Loading the program
Java Virtual Machine verification for bytecode- Jvm has a bytecode verifier that is due to maintenance of the security of the program. The bytecode verifies the code only and only after the classes have been loaded in the memory to maintain the security of the program. It makes sure that the bytecodes are valid and accessible. Additionally, it protects the computer from a variety of viruses and unsafe websites. Java Program Execution-The above steps are executed by JVM when it interprets the bytecode. Earlier JVMs only interpreted one bytecode at a time and were slow. Nowadays the modern JVM’s are much faster as they use JIT(just-in-time) compilation units. These JVMs can execute various tasks at the same time. We also call them HotSpot compilers as they are used by JVM to find out the hot spots in our bytecode. Later on, the source code is converted bytecode into machine language.
Let’s understand the tools that come in handy when we code in the java programming language.
Java Development Kit : As the name formally states Java development kit is a full-time kit that has a compiler, Java Runtime Environment(JRE), Debuggers, Java documents inclusive in it. We need to have the Java Development Kit (JDK) installed on our computers in order to continue with the creation, compilation, and execution of the Java program. Here, as we use JDK we need an environment to run the programs.We use JRE Java Runtime Environment which provides the least requirements to execute the java program. It supplies the Core classes, the JVM, and supporting files.
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