Understanding Java Internals: Speed and Performance
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12 Mar 2025 05:26:23 am.
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It was developed with the intent to develop television interactivity, but it was too advanced for its time. The technology infrastructure and devices of that time were not adequately prepared to leverage Java's advanced features.
In recent times, we have seen Java still in the spotlight as it is the software that most big tech companies adopt due to its versatility. It's very much in demand as a primary language for building enterprise-level applications on different platforms.
You need to be familiar with a few fundamental ideas before we can continue our investigation into the inner workings of Java. Understanding what it means for a programming language to be compiled or interpreted are examples of these ideas. Compiled versus Interpreted Languages We have often heard of these terms, but to understand them better, let us picture a foreign student embarking on two journeys to different locations.
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They rely on an interpreter or translator to communicate with the locals in the first scenario because they arrive at the location without knowing the language or customs. This is similar to how an interpreter in an interpreted programming language automatically translates code so that a computer can comprehend it. In the second scenario, the student was prepared to take classes to acquire the necessary language skills and is familiar with the culture of the destination. On arrival, they doesn't need an interpreter in order to communicate with the natives of that area. This is comparable to the operation of a compiled language. You can distinguish between a compiled language and an interpreted language by comprehending these two scenarios. The first method continuously translates each code line. That is a real-time translation, similar to how the student used a translator/interpreter in the example. The latter, on the other hand, first predigests the code to guarantee a smooth flow. Then, like our prepared student communicating fluently, it "compiles," or transforms it into machine code that the computer can understand and execute. The ability to communicate between computer systems and programmers is the common purpose of each of these programming terms. Now that you have a better understanding of these programming terms, let's talk about how Java works. How does Java function? Java is unique in that it can be compiled and interpreted at the same time. The basic flow is that it is first compiled from source code into what we call bytecode. The Java Virtual Machine (JVM) interpreter is then used to translate it into machine code. This interpretation happens at runtime, so you can refer to Java as an interpreted language and also a compiled language.
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Now you might ask what is bytecode?
Most of the time, the terms "source code" and "machine code" are used to describe program compilation and interpretation. "Bytecode" is similar to "machine code" in that it is compiled source code, but it is not executable unless it is interpreted by a virtual machine, in this case the Java Virtual Machine.
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