Java Quick Reference

Language Fundamentals

Operators and Assignments

Flow Control and Exceptions

Declarations and Access Control

Garbage Collection

Overloading and Overriding

Threads

The java.lang Package

The java.util Package

The java.awt Package

The java.io Package

References

Miscellaneous Notes

Tips & Traps

Mock Exams

Extracting Source code for the Java API classes

To extract source code for the Java Class files, check your JDK directory for a src.jar file. In the same directory, enter

    jar tf src.jar > srcList.txt

This will create a text file listing all the .java files in the src.jar file.
View the text file to locate the path name of the class you're interested in and then type:

    jar xf src.jar file pathname
    
    For example, to extract the Reader.java file
        jar xf src.jar src/java/io/Reader.java

Compiling with JDK 1.3 under Win98

If you're having problems compiling check the following:

you do NOT have CLASSPATH set in your AUTOEXEC.BAT file (JDK 1.3 does not require the DOS environment variable).
If the variable is set because of other programs, make sure it begins with a '.\' to ensure the current directory is always included.
you are issuing the compile command from within the directory containing the .java source file
if you are using the javac switch -classpath DO NOT include an ending '\'

JRE can't locate .jar files under Win98

If you've downloaded some .jar files and installed them, as instructed, to the jdk1.3\jre\lib\ext directory but you're still getting ClassDefNotFound errors when you try to run an application that references the jars; check your system for a Java JRE Plug-in. If one exists, copy the .jar files to that ...\jre\lib\ext directory and re-boot.

The Runtime should now be able to find the .jar files properly.