Jython. An introduction by Thinh Le
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1 Jython An introduction by Thinh Le
2 precursor_python! Google App Engine! Dropbox! PyGTK (Gnome)! Vim (embedded)! BitTorrent/Morpheus! Civilization/Battlefield
3 Jython! Interpretation of Python (1997)! Jim Hugunin & Frank Wierzbicki! Python written in C! Rewrite in Java! Runs on JVM! Interpreted Language! Object-Oriented
4 Scripting Language! Easy to learn and code! Expressive! Minimal structure (less lines of code)! Does not require compilation! Supports functional programming! Runs external programs
5 Hello World! print Hello, world!! does not need to be enclosed in class or func! Jython does it behind the scenes
6 File I/O! file = open( filename.txt, r ) for line in file.readlines(): print line file.close()
7 Event Handling! from javax.swing import * def hello(event): print Hello, world! frame = JFrame( Hello There ) button = JButton( Hello, actionperformed = hello) frame.add(button)
8 Method Overloading! from java.lang import Float, Double foo(float(9.5)) foo(double(9.5))
9 Classes! class Hello: def _init_(self, name= John Smith ): self.name = name def greeting(self): print Hello, %s % self.name jane = Hello( Jane Smith ) joe = Hello( Joe ) default = Hello() jane.greeting() joe.greeting() default.greeting()
10 Advantages/Disadvantages! Readability! Increase programmer efficiency! Code is dynamically converted to Java byte code! eliminate performance issues! Cross-platform compatible! Slow! cannot detect undefined variable (caught at runtime)
11 Implementation! IBM WebSphere (App server)! IBM Rational (SDLC)! WebLogic Server! Sikuli Demo
12 Questions?
13 An introduction by Thinh Le Objective-C
14 Objective-C! Developed in the 1980s by Stepstone! Superset of C! Any C program compilable as Obj-C! Object syntax derived from Smalltalk! Dynamic typing, message based
15 Objective-C 2.0! Introduced with Mac OS 10.5! Only supports runtime systems! GNUStep, Cocoa, Cocoa Touch! Supports garbage collectors, properties, dot notations, fast enumerations! ios devices (iphone, ipad)
16 Classes / Types! Class (methods, instance variables)! Inheritance (can have super class)! No single root class like Java! Object Types:! id, nil, self ( this in Java), super! All C-Types can be used (int, float, short)
17 Methods / Messaging! Methods on object called via messaging! Sends msg w/message name to receiver! Msg can have return value (0 or nil)! Nested messagess: [[receiver msg1] msg2]! Parameters: [rectangle setx: 5 y: 10]! Dot Syntax: rectangle.width = 15;
18 Memory / Protocols! Objects created are allocated memory! Must be released when scope ends! Protocols similar to Java interfaces! List of methods independent from class
19 Protocol - Example
20 Exception Handling! Similar to { }@catch (NSException *e) { NSLog(@ Caught %@: %@, [exception name], [exception reason]); }
21 Hello World! #import <stdio.h> int main (int argc, const char *argv[]) { printf ( hello world\n ); return 0; }
22 ! DEMO
23 GO An introduction by Thinh Le
24 What is Go?! Experimental! Tools & packages still in development! Concurrent and Garbage-collected! Systems programming (compilers, web server)! Created by Robert Griesemer, Ken Thompson, Rob Pike of Google (2009)
25 Purpose of Creation! Resource demands by applications! Bigger libraries! More dependencies! Growth of clusters in Client/Server systems! Main stream multi-core processors! Internet and networking becoming pervasive
26 Goals of Go! Efficiency and ease of use! Performance within 10-20% of C! Type safe and Memory safe! Concurrency ( )! Garbage Collected! High-Speed Builds! Fast compilation & linking
27 Example! package main import fmt //package for Printf func func main() { //functions have func keyword fmt.printf( Hello World! ) }
28 Loop! func main() { sum := 1 i := 1 for i <= 5 { sum += i; i++ } fmt.printf( Sum is %d, sum) }! for loop is only loop supported in Go
29 Functions as Objects! func for_all(arr []int, foo func(int)) { for i := 0; i<len(arr); i++ { foo(arr[i]) } } func print(i int) {fmt.printf( %d, i) } func main() { for_all([] int {1,2,3}, print); }! Similar to functional language. ie. Closjure
30 Structures! type Point struct { } x, y int func main() { p := Point {10, 20} fmt.printf( p value is = %v, p) }
31 Methods! type Point struct { x, y int } func (p Point) Print() { fmt.printf( p value is = %v, p) } func main() { p := Point {10, 20} fmt.print() }
32 ! Demo
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