Question
What is difference between List < ? > and List < Object > in Java
Answers
List < ? > is List of unknown type while List< Object > is essentially List of any Type.
You can assign List< String >, List< Integer > to List< ? > but you can not assign List< String > to List< Object >.

This is because List< Object > can store any any thing including String, Integer etc but List< String > can only store Strings.   Your Comment




  • Contributors: *,
More Software,Java Questions..
What is the inputsplit in map reduce software?
Can variables be used in Java without initialization?
What is the difference between java bean and enterprise java bean?
What is software configuration management?
How does the java database connectivity (jdbc) work?
What are the advantages of threads in java?
What Is Java Api For Xml-based Rpc (jax-rpc)?
How can you implement fine-grained auditing?
What is IBM’s simple explanation for Big Data’s four critical features?
What is static synchronized method in JDBC API? Give an example?
What does the NULLIF function do?
What happens if a start method is not invoked and the run method is directly invoked?
Should we override finalize method
what is the difference between mysql_fetch_array and mysql_fetch_object?
How will XML affect my document links?
What is object cloning in Java?
Why to use Style Sheets?
What are Filters in MVC?
Can you explain Application layer in OSI model?
How to define new testplan attributes?


Search
Can you Answer!!
  • Q Which states are related with the dispute of “Mullaiperiyar dam”-
  • Q How To Write Numeric Literals?
  • Q What do the sas log messages "numeric values have been converted to character" mean? what are the implications?
  • Q Write short notes on Marketing management in newspaper
  • Q The Pentagon in Arlington, Virginia, USA, said to be the highest-occupancy office building in the world accommodates roughly how many staff: 9,000; 15,000; 19,000; or 26,000?
  • Q Tell me about a time when you asked for extra responsibility in any of your previous jobs.
  • Q Have you ever dealt with company policy you weren't in agreement with? How?
  • Q What are different daemons in YARN?
  • Q What is Body Therapy?
  • Q Why is it necessary that file needs to be opened in I-O mode for REWRITE?
  • Q What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?