Question 1. What Is The Difference Between Judo And Other Scripting Languages? What Is The Compelling Hook Over Others?
Judo is a powerful programming and Java scripting language. What differs it from others is, Judo has many integrated language constructs for popular application regions, making their uses intuitive, herbal and stylish. With such a 3GL-4GL language design, Judo places superb emphasis on ease-of-use as well as ease-of-software.
Take Python, a great example of conventional programming languages, especially so-called scripting languages. It employs a small set of core language syntax and constructs, including a library mechanism that permits users to increase functionalities of the language. A library is a group of APIs that application software program are constructed upon. To make sure maximum reusablity and applicability, APIs are usually low-degree and detailed relative to the problem you are trying to clear up. Such is the 3GL technique.
If 4GL is a new time period to you, reflect onconsideration on Unix shells. Unix shells are legitimate programming languages, and has special commands that pertain to subjects not unusual to all Unix machine users, which include document system manipulation, method manipulate, machine configuration, and so forth. For instance, you operate 'cp' command to replicate documents, in place of coding a activity-manipulate-language (with APIs) to do the identical. Judo is the first and only Java-based totally scripting language that does all of the above however extends its reach into a lot of state-of-the-art popular utility fields, together with JDBC scritping, XML scripting, SGML scraping, COM scripting, net scripting, GUI scripting, and many others. This is the compelling hook over most different scripting languages.
Question 2. How Does Judo Compare To J/python?
Jython, BeanShell, Rhino, Judo and different Java-based totally scripting languages are all preferred-cause programming languages and are capable of scripting Java, no matter their syntax differences. On top of that, Judo also gives many application degree scripting capabilities at the language stage, so Judo helps object-stage, OS-level and application-stage scripting.
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Question 3. What Is The Licensing Term Of Judo?
LGPL. You are basically unfastened to do something with the software program and its source code.
Question four. When Not To Use Judo?
Scripting languages are extremely good for doing things quickly, or obligations which can be simple, honest and take regularly updates. Scripting languages aren't designed for constructing massive software; this is the task of machine languages consisting of C, C++ or Java. If a huge software task is coded in a scripting language, you may quite plenty assume it's miles nevertheless in prototype stage. Why? Because machine languages have mechanisms that permit compilers put into effect stringent rules so that you can save you many potential troubles; compilers can also optimize the final product to advantage greater overall performance.
Judo, being a natural scripting language, is not any exception to this rule.
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Question 5. Why The Name Judo?
Better names are already taken. The name is selected because a) it sounds good enough, and b) it begins with "J".
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Question 6. What Are Judo's Shortcomings?
Judo is definitely based totally on Sun's Java. Java implements the not unusual denominator of all supported platforms, and is not outstanding to address popular platform features which includes 'chmod' on Unix. Judo tries difficult to offer functions on popular platforms by means of running around Java's problems (for instance, 'chmod' and 'chown' are carried out for Unix structures, surroundings variables are treated, and so forth.), but there need to be situations wherein platform local code (through JNI) is wanted. The traditional instance is COM scripting. This does no longer always destroy the "a hundred% Pure Java"-ness of Judo, because such functions are declared to be non-obligatory. By the manner, Judo never troubled to bypass the "a hundred% Pure Java" take a look at.
Question 7. What About Judo's Performance?
Judo's performance is fantastically accurate, most probably thanks to the JVM JIT compilers. The begin-up is not that speedy; on Windows 2000 and (slower) Linux machines, small to medium size scripts take 2 to four seconds to begin executing.
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Question 8. Can You List Some Facts About Judo?
Designed floor-up only for Java.
Open-source freeware under LGPL; can be use for industrial or any purposes.
Is a 3GL and a 4GL.
Hybrid procedural and item-orientated language.
Basic records sorts encompass integer, floating-factor quantity, date/time and string; each with massive number of operations (strategies).
Advanced statistics structures:
array and related listing; flexible sorting and filtering
struct and ordered map; bendy sorting and filtering
stack and queue
table information; in-memory relational database capabilities
Support superior programming strategies:
person-defined classes and inheritance
exception managing and resume announcement
thread programming just like functions
consumer-defined features; can take variable range of parameters, and parameters will have default values
characteristic variables and lambda features
dynamic evaluation of code and files
flexible iterations of arrays and related lists
Java-like statements and expressions.
Syntactic sugar, inclusive of various remark codecs for Unix automobile-run and code disabling.
Seamless makes use of of Java training, gadgets and arrays.
Java collection classes proportion equal syntax as Judo field data systems.
Java static techniques may be aliased to come to be Judo capabilities.
Explicit JNDI support to facilitate RMI and EJB scripting.
Is extensible with the aid of Java lessons or via Judo libraries or a combination of both. Library code can be moved from Judo into Java (later) without changing the interface.
All current Java software tool programs, industrial or unfastened, may be used immediately in Judo.
Sophisticated JDBC scripting and database manipulation capabilities.
Many built-in application functions; a few with special syntax (consequently 4GL), others are device capabilities. An incomplete listing includes:
Microsoft COM scripting
HTTP/HTTPS consumer and server
Schedule jobs with HTTP video display units
Flexible report copying and archiving between report structures, JAR, ZIP and TAR documents
Consistent I/O version for neighborhood documents, files within JAR/ZIP/TAR archives, gzipped documents, internet sources and string data resources
FTP, SSH, SCP, networking services, Windows registry enhancing, Unix syslog
Versatile executable going for walks
Java GUI advent
Text and statistics processing capabilities
Embeddable by way of Java software both by Bean-Scripting-Framework or through its very own engine.
Is interpreted. Precompilation is deliberate.
Rich documentation for reference, tutorials and examples.
Question 9. Why You Created Judo?
To use Java for the entirety, not just programming. Specifically,
to scripting Java,
to scripting many tasks extremely without problems, and
to do those within an smooth and effective programming surroundings.
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Question 10. Is Judo Embeddable In Java Software?
Yes, in one of the methods: its engine API and its BSF guide.
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Question 11. How To Use Threads In Judo? Can I Use Java Thread Objects?
Since you may use any Java items in Judo packages, nothing prevents you from the usage of java.Lang.Thread gadgets, however that is strongly discouraged.
Question 12. Can I Script Java Classes Of The Judo Engine?
This is illegal (through the language engine) except for the com.Judoscript.Util.* package and its sub-packages. And their makes use of are not documented or guaranteed.
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Question thirteen. What Is Native Support In Judo? What Is A Non-local Support Then?
A local aid in Judo generally manner particular syntax support in Judo, every now and then it is only a integrated function. A "non-native" support for a Java software or function essentially way you need to application the usage of the Java APIs.
Question 14. Are Judo's Jdbc Scripts Cross-rdbms's?
It "Is Java's JDBC go-RDBMS's", because Judo does not offer some thing past what JDBC drivers offer. In different words, Judo passes SQL and other parameters through JDBC API to the unique JDBC motive force being used without further filtering and interpretation.
Question 15. How To Specify A (non-built-in) Jdbc Driver Class?
You can use the Java manner of Class.ForName(jdbcDriverClassName), or specify it as an characteristic of "driving force" in the database connection announcement.
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Question sixteen. How To Copy Multiple Directories Into A Single Zip File?
Use createJar(), createZip() or createTar() gadget capabilities to create a ZIP or tar archive, then use the reproduction command for each directory into that archive earlier than subsequently name the near() method of the archive item to finish.
Question 17. How To Serialize Executable Runs?
By specifying a variable to receive the return price of the executable, you may effectively serialize a couple of executable runs.
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Question 18. Can I Use My Java Classes? Do I Have To Specify My Long Java Class Names Everytime?
Any Java training may be used in Judo. Use the Java bundle name shortcut mechanism to make it less difficult to apply if your Java elegance names have long bundle names.
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Question 19. How To Use Java Static Members And Methods?
Use :: between the Java magnificence name and the static method or member call to use them. Or, If a static Java technique is again and again used, can use the static Java approach alias mechanism to lead them to appear like normal Judo features.
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Question 20. What Is The Easiest Way To Read A Text File, Line-through-line?
Use the do ... As strains statement.
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Question 21. Is Judo Good For Templates?
You have ways to create a templating machine in Judo,
For simple text alternative, use the do ... As traces assertion.
You can outline your own SGML format with tags, case-sensitively or insensitively, and eaily create processing software program with the do ... As sgml declaration.
Another comfort is the Local Data mechanism, that you may attach a template proper on the stop of the script.