May 23 marks 20 years since the first version of Java was released for public use. The timing of its arrival coincided with the advent of the web and the new role technology took in improving business productivity, streamlining business processes, and creating new ways for businesses and customers to interact.

The importance of a given programming language—especially one as pervasive as Java—in changing how people use technology is difficult to underestimate. The big data revolution, for example, is primarily a Java phenomenon.

In industry and business, most of server-side computing is done using Java applications. And much of the Internet of Things is also emerging on Java devices.

But 20 years ago, the language was delivered to an entirely different set of needs: a good, general-purpose language for desktop computing.

Java arrived at an important moment in software development. Up until then, the primary programming languages were few and well-established: Fortran in scientific computing, COBOL in business, and C or the emerging C++ everywhere else in commercial programming.

While less popular languages filled specific niches—Ada (defense), Pascal (hobbyists and consultants to SMBs), Smalltalk and Lisp (academia), Perl (system administrators), and so on—the Big Three dominated computing.

Fatigue with C

However, a fatigue with C was definitely emerging. The language had two major handicaps in those days: First, it was too low level—that is, it required too many instructions to perform even simple tasks. Second, it wasn’t portable, meaning that code written in C for the PC could not easily be made to run on minicomputers and mainframes.

The low-level aspects, which still are apparent today, led developers to feel that writing applications in C was akin to mowing the lawn with a pair of scissors. As a result, large software projects were tedious and truly grueling.

The portability of C was also a major problem. Although by 1995, many vendors had adopted the 1989 ISO standard, they all added unique extensions that made porting code to a new platform almost impossible.

It’s no coincidence, then, that this era saw the emergence of a new generation of languages. In 1995 alone, there appeared Ruby, PHP, Java, and JavaScript.

Java almost immediately became popular for mainstream programming due to its portability and large set of built-in libraries. The then-mantra for Java was “write once, run anywhere.” While not strictly true initially, it quickly became so, making Java a good choice for business applications that needed to run on several platforms.

’s subsequent embrace of Java (especially via Project San Francisco) clinched the new language’s central place in business programming.

Once a language becomes mainstream, it tends to have a long lifetime, as will be demonstrated this year when the languages born in 1995 all begin celebrating their twentieth anniversaries. What makes Java stand out, though, is how much the language and platform have evolved in that time span.

Most conspicuous, to me at least, is the change in the Java Virtual Machine (). While it delivered portability almost from the start, it did not initially deliver speed. Java was known for being slow to start and slow to run.

Continual Improvements

Today, Java is among the fastest languages and can scale to programs that can process vast resources, as the big data revolution—a mostly Java-based phenomenon—has amply demonstrated.

The language, too has seen extensive revision. From a start in which there were rough corners lying here and there, Java has evolved into a tool that can address almost every kind of programming problem.

The advent of Java 8 in particular added important features taken from functional programming idioms that make code shorter, more reliable, and more expressive.

The details of Java’s history are so well known that it’s easy to forget how truly rare it really is. The rarity is that few languages have benefited from constant, large-scale engineering investment for two decades. Among major languages today, only ’s C# (and the .NET runtime) has been favored in this same way.

At one time, it was hoped that large communities of developers would be capable of driving this change by themselves. And certainly, the rapid pace at which early development tools advanced gave all programmers reason to believe. But those early tools turned out to be outliers, rather than heralds of coming things.

So, while others might celebrate 20 years of Java as if language endurance were in itself a major accomplishment, I prefer to celebrate the sustained rate of innovation and the 20 years of continuous investment required to make that happen.

java20

Oct	MAR	Aug
	14
2015	2016	2017