Question: generics

Ads

 
 
 

Share on Google+Share on Google+

deepa
generics
2 Answer(s)      7 years ago
Posted in : Java Beginners
Ads
View Answers

June 18, 2009 at 11:52 AM


Hi Friend,

If you want to take an element from the Collection, you have to cast the type of element that is stored in the collection.The compiler does not check that your cast is the same as the collection's type or not, which makes the cast fail at run time.To overcome this situation Generics provides a way to communicate the collection type to the compiler which aware the compiler about the element type of the collection, and can insert the correct casts on values being taken out of the collection.

Generics provide a mechanism for annotating type information for the use of the compiler. By providing this information, the compiler can in turn verify the consistent use of "genericized" classes and automatically insert explicit casts, eliminating the need for programmers to do so manually.

The Generics makes its information available only at compile time and not translated into the compiled bytes. This allows genericized classes to interoperate cleanly with legacy, or raw, types.

It has the ability for library authors to express their intent more cleanly. Generics help to enforce the contents of collections and other genericized classes.

Generics can be used in more than just collection classes which allows developers to write their own genericized classes and genericized methods with generics.

Thanks


September 13, 2011 at 8:13 PM


hello sir/madam,

i am looking to develop mobile application project for some good practice, please advice me.

thanks


Ads









Related Tutorials/Questions & Answers:
Advertisements
eraser type generics in java
eraser type generics in java  Explain eraser type generics in java with example
Why Generics was introduced in Java?
Why Generics was introduced in Java?  Hi, Why Generics was introduced in Java and what is was its motive? Thanks   Generics were... for compile time type checking. Read the tutorial for more details of Generics
Tutorials   
Java Spring Hibernate Struts Training Apache Commons ioutils maven dependency Read/Convert an inputStream to a String What is the meaning of Java Platform? Why Java is a platform independent language? What is the benefits of learning Core Java? Which technology should I learn after Java? What is array in java with example? How to Convert ArrayList to Array? How to substring in Java? How to format number in Java? What is instance variable in Java? How to download MySQL JDBC driver? What is Calendar class in Java? Which is the best Java tutorials for beginners? How to rename a file in Java? How to delete file in Java code? How to get day from date in Java using Calendar? How to get day of week in Java? How to calculate Date Difference in Java? How to compare date in Java? How to declare array in Java? How to calculate average of array in Java? What is Array in Java? write a java program to find the summation of all the integers entered on command line Sum of two numbers using command line arguments in Java How to create and use Array in Java? How to pass command line arguments in Java? How to create Applet Hello World? Appending String efficiently in Java How to append String in Java? How to list even numbers between 1 and 100? How to add BigDecimal in Java? What is Abstraction In Java? Which is best Beginners Java Tutorial? What is java.util package? Create list from array in Java Filter collection in Java 8 What is the best way to filter a Java Collection? Easy way to transform Collection to Array? How to convert Collection to Array in Java? What are Basic Java Language Elements? Advanced Java Tutorials in 2017 Java brief history Best Reasons to learn Java Java Example Codes and Tutorials in 2017 How do I read a large file quickly in Java? Is learning Java worthwhile? How to create first Java Program? Retrieve database from the table dynamically in jsp from oracle using servlet What does core Java include?

Ads

 
Advertisement null

Ads