Difference between revisions of "Multi-Paradigm Programming and Scripting"

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(Reflection in Java)
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===Reflection in Java===
 
===Reflection in Java===
 
 
*Limited support from <code>java.lang.Class</code>
 
*Limited support from <code>java.lang.Class</code>
  
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*The <code>getClass</code> method of <code>Class</code> returns the <code>Class</code> object of an object
 
*The <code>getClass</code> method of <code>Class</code> returns the <code>Class</code> object of an object
 
 
::<code>float[] totals = new float[100];</code>
 
::<code>float[] totals = new float[100];</code>
 
::<code>Class fltlist = totals.getClass();</code>
 
::<code>Class fltlist = totals.getClass();</code>
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*If there is no object, use class field:
 
*If there is no object, use class field:
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::<code>Class stg = String.class;</code>
  
::<code>Class stg = String.class;</code>
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* '''Class has four useful methods:'''   
:* '''Class has four useful methods:'''  <blockquote><code>getMethod</code> searches for a specific public method of a class</blockquote><blockquote><code>getMethods</code> returns an array of all public methods of a class</blockquote><blockquote><code>getDeclaredMethod</code> searches for a specific method of a class</blockquote><blockquote><code>getDeclaredMethods</code> returns an array of all methods of a class</blockquote><blockquote>The <code>Method</code> class defines the invoke method, which is used to execute the method found by <code>getMethod</code></blockquote><br />
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:: <code>getMethod</code> searches for a specific public method of a class
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:: <code>getMethods</code> returns an array of all public methods of a class
 +
:: <code>getDeclaredMethod</code> searches for a specific method of a class
 +
:: <code>getDeclaredMethods</code> returns an array of all methods of a class
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:: The <code>Method</code> class defines the invoke method, which is used to execute the method found by <code>getMethod</code></blockquote><br />
  
  
 
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Revision as of 20:40, 30 October 2019

  • Improved background for choosing appropriate languages



Compilation vs Interpretation


Phases of Compilation

Phases of compilation.png



C++ Inheritance

https://www.w3schools.com/cpp/cpp_inheritance.asp

https://www.tutorialspoint.com/cplusplus/cpp_interfaces.htm



Difference Between Static and Dynamic Binding

https://techdifferences.com/difference-between-static-and-dynamic-binding.html



Reflection in Java

A programming language that supports reflection allows its programs to have runtime access to their types and structure and to be able to dynamically modify their behavior

  • The types and structure of a program are called metadata
  • The process of a program examining its metadata is called introspection
  • Interceding in the execution of a program is called intercession


Uses of reflection for software tools:

  • Class browsers need to enumerate the classes of a program
  • Visual IDEs use type information to assist the developer in building type correct code
  • Debuggers need to examine private fields and methods of classes
  • Test systems need to know all of the methods of a class



Reflection in Java

  • Limited support from java.lang.Class
  • Java runtime instantiates an instance of Class for each object in the program
  • The getClass method of Class returns the Class object of an object
float[] totals = new float[100];
Class fltlist = totals.getClass();
Class stg = "hello".getClass();
  • If there is no object, use class field:
Class stg = String.class;
  • Class has four useful methods:
getMethod searches for a specific public method of a class
getMethods returns an array of all public methods of a class
getDeclaredMethod searches for a specific method of a class
getDeclaredMethods returns an array of all methods of a class
The Method class defines the invoke method, which is used to execute the method found by getMethod