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Java was an excellent idea on paper. It allowed programmers to create a single program and expect it to work with most of the operating systems available. This is achieved by not using the native code of a particular operating system. Instead, Java takes its own code and then runs it on a virtual machine, which interprets the Java code into the native code of the opposite.
As mentioned earlier, it looked fine on paper, but in practice Java programs were significantly slower than programs encoded in native code. This was mainly due to the fact that each code had to be processed twice, by the virtual machine and then by the operating system.
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Compiler vs. Interpreter
Java uses static typing . This means that the data type of a variable is checked at compile time. The programmer must therefore explicitly specify the data type when declaring variables ( int , double , boolean , ..).
- If we consider Java, it is an OOP programming language, while Java Script is an OOP scripting language.
- You need different plug-ins.
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