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Suit up with lightning fast reflexes, super strength, cool gadgets, and powerful suits of armor in the Superheroes Unlimited Mod. This mod allows players to play as their favorite comic book and tv heroes and villains in order to dominate the world. Java is built in to Mac OS X, which makes Apple, rather than Sun, the main source of core Java software for the platform. Java 5 is only supported since version 10.4 (Tiger) of the operating system, and Java 6 requires OS X 10.5 (Leopard) and a recent (64-bit Intel) machine.

DrJava is an integrated development environment (IDE) for writing, compiling and debugging programs in the Java programming language. This documentation is focused only on getting DrJava running, other documentation is available at the end of this post.

NOTE: (1/25/2017) The documentation has been updated to reflect the use of only Java JDK 8.

NOTE: (9/7/2015) The Mac version of DrJava has been removed from this documentation. Although you can still download it from Sourceforge, you cannot use JDK 8 with the Mac version. These have been updated to allow you to use JDK 8.

Step One

Answer two short questions:

1. Is your operating system Windows, Mac or Linux?
2. If it's Windows or Linux, is your operating system 32- or 64-bit?

Step Two

Visit Oracle to download the latest version of Java SE 8 JDK for your specific operating system. Both 32- and 64-bit versions are available for nearly every platform.

Install the Java SE JDK on your operating system according to the manufacturers recommendations.

Step Three

Download the DrJava IDE for Windows, Mac or Linux.

Windows users can simply double click the program and it will launch.

Mac and Linux users can run the following command in the directory where the JAR file lives: java -jar drjava.jar

Step Four

Read further:

DrJava User Documentation
Java 8 API

In Java, like in almost any computer programming language, reading data from a file can be tricky. You add extra lines of code to tell the computer what to do. Sometimes you can copy and paste these lines from other peoples’ code.

For example, you can follow the pattern in this listing:

You want to read data from a file. You start by imagining that you’re reading from the keyboard. Put the usual Scanner and next codes into your program. Then add some extra items from the listing pattern:

Drjava Download Mac

• Add two new import declarations — one for java.io.File and another for java.io.IOException.

• Type throws IOException in your method’s header.

• Type new File(“) in your call to new Scanner.

• Take a file that’s already on your hard drive. Type that filename inside the quotation marks.

• Take the word that you use for the name of your scanner. Reuse that word in calls to next, nextInt, nextDouble, and so on.

• Take the word that you use for the name of your scanner. Reuse that word in a call to close.

Drjava Mac

Occasionally, copying and pasting code can get you into trouble. Maybe you’re writing a program that doesn’t fit the simple listing pattern. You need to tweak the pattern a bit. But to tweak the pattern, you need to understand some of the ideas behind the pattern.