Compiling Java code

Overview

  1. Console Output
  2. Console Input
  3. Create Project
  4. Using Console I/O

Working from Home

Compiling code on the command-line

As discussed on the first slide, all the code is contained in the workspace you specified in the home directory. If you followed the example image, your workspace is a folder called CMSC202 in your home directory.

Browse to your project folder (LabAssignments), then the source code folder (src). In your source folder should be a folder called lab2.

The example below illustrates how to compile your lab2 code directly from a UNIX terminal.

We use the javac command to compile the contents of the lab2 directory. 
javac -d . lab2/*.java

To execute your code, use the command 

java lab2.ScannerInput

Important Note: Make sure you run the above two commands from the "src" directory. Running them from any other folder might cause unexpected errors like the ones shown below: 

linux1[29]% javac -d . lab2/*.java
javac: No match.
linux1[30]%
OR 
linux1[27]% java lab2.ScannerInput
Exception in thread "main" java.lang.NoClassDefFoundError: lab2/ScannerInput
Caused by: java.lang.ClassNotFoundException: lab2.ScannerInput
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: lab2.ScannerInput. Program will exit.
linux1[28]%
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