1,001 Java Tips, Gotchas and Snippets!

 

Read Me:        

 

                        Welcome !

 

o       This site focuses on Java fundamentals, collections, and I/O.  Meaning just the features you are most likely to use every day.  Plus gotchas you are likely to encounter on the Java Certification tests.  It is meant to be used in conjunction with the online Sun Java API documentation.

o       Details are at the level you will encounter in the Sun Java Certification exams.  This material was my own exam study notes.

o       You’ll find handy things here which you won’t find anywhere else.  Just a few examples:
Charts of  'How to perform conversions'       
Diagrams of  ‘How collection methods work’        Tables of ‘What I/O classes do’

o       For brevity, methods are often mentioned as method( ) or method(...) without showing full signatures. If referred to as method( ), with empty parens, the method never requires parameters.  Methods listed as method(...), showing three dots within the parentheses, require parameters. 

o        Java exceptions in snippets are caught using the inelegant but brief  catch(Exception e)  { }.  Snippet statements which can throw exceptions are usually enclosed in try-catch blocks.  Necessary import statements are usually provided above snippets.

o       The word “characters” always means Unicode characters such as UTF-8 or UTF-16.  The word “bytes” always means 8-bit bytes such as ASCII or the machine's native encoding.

o       Names of actual Java keywords, classes, methods, and primitives appear in bold like this.

o       Other conveniences: 
- Methods which are always called by affixing them to an object with a dot will show you the dot.   i.e. 
.close( )
- For brevity, 
int can be assumed as the default parameter type.  Methods with int parameters will show you the required parameter information instead of the int.   i.e.  .charAt( index )  instead of  .charAt( int i )

Enjoy !  Joe Kaz