Mon, 01 Jan 0001 00:00:00 +0000

Exceptions #

Basics #

An exception occurs when something unintended occurs and the interpreter must exit.

While this might sound like a bad thing, we can often throw our own exceptions to handle known errors or edge cases more gracefully.

In Java, there are two types of exceptions: checked and unchecked.

Checked exceptions are handled during compile time, and are included in the method declaration. As an example:

Mon, 01 Jan 0001 00:00:00 +0000

[!warning] Content Note

Make sure you’re comfortable working with binary numbers (adding, subtracting, converting to decimal) before continuing.

For the mathematical foundations of modular arithmetic (congruences, inverses, GCD), see [[cs70/discrete-math/modular-arithmetic]].

This is an excerpt from the chart in Java Objects. Go there to review primitive types first!

Type	Bits	Signed	Literals
byte	8	yes	3, (int)17
short	16	yes	None - must cast from int
char	16	no	‘a’, ‘\n’
int	32	yes	123, 0100 (octal), 0xff (hex)
long	64	yes	123L, 0100L, 0xffL

A type is signed if it can be positive or negative. Unsigned types can only be positive.

Mon, 01 Jan 0001 00:00:00 +0000

Here are some more cool things to look at!

Big O Cheat Sheet - complexities of sorting and common data structure operations
Toptal Sorting Algorithm Animations - animations, pseudocode, and property summaries
Josh Hug’s 61B Playlist - concise video lectures for most 61B topics
Balanced Search Demos - play around with balanced search structures and see how they work