Java background:
We look briefiy at what the designers of Java tried to achieve. As with many successful inventions, it eventually went in directions that its designers had not expected. We explore how the different versions of Java are distinguished, including the concept of Java editions to cater for systems of differing scales. We also take our first look at a simple Java program.
The developers of the Java language had a number of design goals. These were set out in their so-called 'white paper' on the Java Programming Language Environment. Later in the course we assess how successful the designers have been in meeting their aims. We list below some of the characteristics the language was to have.
- Simple: Java has a small, consistent core of fundamental concepts, which should make it simple to learn.
- Familiar: the language syntax is closely based on the popular C++ language, although reduced in complexity.
- Object-oriented: Java programs are structured around objects - we will explore this later in the unit.
- Robust: Java programs are strictly checked by software before they run and the language omits various error-prone features of C and C++.
- Secure: Java has special security features to ensure that programs running over networks cannot damage your computer files or introduce viruses.
- Portable: Java programs can easily be transferred from one platform (such as Windows on a PC) to run on another platform (such as Linux on a specialized server) with little or no change.
- High performance: Java programs can run fast enough for what is needed in each aspect of a program.
- Interpreted: we explain interpreted languages later, in Section 3, but at this stage we will just note that this is a key aspect of Java portability.
- Threaded: threaded languages allow a program to do several things at once, which can greatly improve performance.
- Dynamic: Java programs can adapt to changes in their environment even while the program is running.
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