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Sather vs Java

Sather vs Java. Brian Oh Ann Win. Introduction (of Sather) History (of Sather) Comparison between Java and Sather Sample - “Hello World” Future (of Sather) For more info. Introduction. Sather is an object oriented language

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Sather vs Java

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  1. SathervsJava • Brian Oh • Ann Win

  2. Introduction (of Sather) • History (of Sather) • Comparison between Java and Sather • Sample - “Hello World” • Future (of Sather) • For more info....

  3. Introduction • Sather is an object oriented language • It was designed to be simple, efficient, safe and non-proprietary. • Sather aims to meet the needs of modern research groups and to foster the development of a large, freely available, high-quality library of efficient well-written classes for a wide variety of computational tasks.

  4. History • Sather was developed at the International Computer Science Institute, a research institute affiliated with the CS department of UC Berkeley. • Sather language got its name from the Sather Tower (popularly known as the Campanile), the best-known landmark on UC Berkeley.

  5. History • Initial Sather compiler (ver 0) was written in summer of 1990. • ICSI made Sather (ver 0.1) publicly available on June of 1991. • Ver 0.2 and 0.5 followed. • Sather 1.0 was released in 1994, and most of the major features such as bound routines and iteration, etc was first introduced in this version • Latest version is Sather 1.1, released the summer of 1996.

  6. History • Sather was originally designed and implemented by Steve Omohundro, David Stoutamire and (later) Robert Griesemer. Boris Vaysman is the current Sather feature implementor. • Sather has adopted ideas from Eiffel. But it has also been influenced by C, C++, Cecil, CLOS, CLU, Common Lisp, Dylan, ML, Modula-3, Oberon, Objective C, Pascal, SAIL, School, Self, and SmallTalk.

  7. Comparison • Object Oriented Programming • Like Java, Sather is object oriented. • All entities in Sather are objects, and objects are defined by classes. • Some basic classes ( INT, FLT, STR). These represents integers, floating point numbers, and strings. Ex) Java float a=3.0; int b =5; String c = “foo”; Ex) Sather a:FLT := 3.0; b:INT := 5; c:STR := “foo”;

  8. Comparison • Garbage collection • Like Java, Sather collects garbage automatically. • The runtime system does this automatically when it is safe to do so. But Sather does allow the programmer to manually deallocate objects, letting the garbage collector handle the remainder. • Sather applications generate far less garbage than typical SmallTalk or Lisp Programs.

  9. Comparison • Strong Type Language • Like Java, Sather is a (statically-checked) strong type language. • Sather is contravariant. That means that it isn’t possible to get type errors at runtime. It also means that the Sather programmer needs to insert explicit type checks (using a typecase) in places where a covariant compiler would have inserted an implicit check for you.

  10. Comparison • No implicit Calls • Like Java, Sather does explicit method declarations. • Sather does as little as possible behind the user’s back at runtime. Meaning, there is no implicitly constructed temp objects. • Also Sather never converts types implicitly, such as from integer to character, integer to floating point, single to double precision, or subclass to superclass.

  11. Comparison • Robustness .. Why? Java and Sather both has characteristics of .... • no pointer, eliminates of a overwriting of memory and corrupting data • automatic garbage collection • Strong type language, allows extensive compile-time checking • explicit method declarations • good exception handling

  12. ComparisonReasons for using Java over Sather • Java is very popular... • distributed so that TCP/IP, networking is easier • architecture neutral.. Java can use same code on many machines while, Sather can not • multithreaded can be done easier.. Java does multithreading on application level and not at the operating system level.. So it is a lot easier to do multithreading with Java then Sather.

  13. ComparisonReasons for using Sather over Java • Itegrators .. These methods encapsulate user defined looping control structures, with creation, increment and termination check. • Sather is as efficient as C, C++, or Fortran, as elegant but safer than Eiffel or CLU, and support higher-order functions as well as Common Lisp, Scheme, or SmallTalk.. So it is great for wide variety of research related computational tasks. • It lets you use a large, freely available, high-quality of efficient well-written classes... Such as Laplace or Krylov matrix solver..

  14. Class HELLO is main is #out + “Hello World!\n”; end -- end of main end; -- end of class HelloWorld ------------------------------------------- cs -main HELLO -o hw hw.sa prompt> hw Hello World public class HelloWorld { public static void main (String[] args) { System.out.println (“Hello World”); } //end of main } // end of class HelloWorld ------------------------------------------------- javac HelloWorld.java prompt> java HelloWorld Hello World Hello World Program

  15. Future of Sather ?? ?? Sather will be around but it will not be as popular as Java, C, C++ or Fortran. ?? ??

  16. For more info visit http://www.icsi.berkeley.edu/Sather or e-mail sather@icsi.berkeley.edu or subscribe the news group comp.lang.sather

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