@Peter Lawrey Dr. Java is an IDE, stdlib is one of the jars I downloaded and am trying to import into my program. I've attempted to manually add these jars to my classpath with no success. – Michael Gruber Sep 18 '12 at 17:26. This site requires JavaScript to be enabled. DrJava is an integrated Java development environment that supports interactive evaluation of expressions. It is available for free, and it is available under an open source license (GPL).

Standard libraries.

Below is a table of the input and output libraries that we use throughoutthe textbook and beyond.

§	PROGRAM	DESCRIPTION / JAVADOC
1.5	StdIn.java	read numbers and text from standard input
1.5	StdOut.java	write numbers and text to standard output
1.5	StdDraw.java	draw geometric shapes in a window
1.5	StdAudio.java	create, play, and manipulate sound
2.2	StdRandom.java	generate random numbers
2.2	StdStats.java	compute statistics
2.2	StdArrayIO.java	read and write 1D and 2D arrays
3.1	In.java	read numbers and text from files and URLs
3.1	Out.java	write numbers and text to files
3.1	Draw.java	draw geometric shapes
3.1	DrawListener.java	support keyboard and mouse events in Draw
3.1	Picture.java	process color images
3.1	GrayscalePicture.java	process grayscale images
3.2	Stopwatch.java	measure running time (wall clock)
3.2	StopwatchCPU.java	measure running time (CPU)
–	BinaryStdIn.java	read bits from standard input
–	BinaryStdOut.java	write bits to standard output
–	BinaryIn.java	read bits from files and URLs
–	BinaryOut.java	write bits to files

Using the standard libraries.

The file stdlib.jar bundles together all of ourstandard libraries into one file.To access the libraries, you must add stdlib.jarto your Java classpath.There are many ways to do so (and many opportunities to make mistakes).Here are the two recommended ways:

• Use the javac-introcs and java-introcs commands.If you followed our installation instructions forMac OS X,Windows, orLinux,the commands javac-introcs and java-introcs are availablefrom the command line (with OS X or Linux) or Git Bash (with Windows).
• Use our IntelliJ project folders.If you use IntelliJ, the project folders we supply are preconfigured to includestdlib.jar in the classpath.

Here are some alternatives:

• Use the -classpath command-line option.Put stdlib.jar in the same directory asthe program you are writing (but do not unjar it).Then, compile and execute as follows:The -classpath option tells Java which directoriesto search for for .java and .class filesThe . refers to the current directory (which contains MyProgram.java and MyProgram.class).The stdlib.jar refers to the jar file containingour standard libraries.On OS X, the : separatesdirectories in the classpath; on Windows the ;separates directories.
• Current directory.Perhaps the simplest (but definitely not the sanest) way to use the standard librariesto download stdlib.jar and unjar itin your current working directory.Alternatively, you can download the individual .java files you need(such as StdIn.java)and put them in the same directory as the program you are writing.Then, compile and execute as usual.This approach has the drawback that you need a copy of each .javafile you need in each directory where you need it.
• Use the CLASSPATH environment variable.You can set your system CLASSPATH environment variable to contain stdlib.jar.We do not recommend this approach because the CLASSPATH variable may be usedby other applications.
• Configure your IDE.You can configure your IDE to include stdlib.jar in the classpath.
  • IntelliJ: select File → Project Structure → Libraries.
  • Eclipse: select Project → Properties → Java Build Path → Libaries → Add External JARs.
  • DrJava: select Preferences → Extra Classpath → Add.
  • Windows Command Prompt: select Start → Computer → System Properties → Advanced → Environment Variables → User Variables → CLASSPATH.

Standard input and standard output.

StdIn.java andStdOut.java are librariesfor reading in numbers and text from standard input and printing outnumbers and text to standard output.Our versions have a simpler interface than the corresponding Java ones(and provide a few tecnical improvements).Average.java reads in a sequence of real numbers from standard input and prints theiraverage on standard output.In.java andOut.java are object-orientedversions that support multiple input and output streams,including reading from a file or URL and writing to a file.Wget.java reads in data from the URL specified on the command line and save itin a file with the same name.

Binary standard input and standard output.

BinaryStdIn.java andBinaryStdOut.java are the analogsfor binary data.Copy.java reads a binary file fromstandard input and writes it to standard output.

Standard drawing.

Download Java For Mac

StdDraw.java is an easy-to-use libraryfor drawing geometric shapes, such as points, lines, and circles.RightTriangle.javadraws a right triangle and a circumscribing circle.

% java RightTriangle

BouncingBall.javaillustrates how to produce an animation using standard drawing.