[android-developers] Re: Java knowledge

Seshu wrote:

Core java is enough but in some cases Collections are also required
for Android Applications.

Collections are part of core Java.

Awdhesh Jha wrote:
> You should be know only core java for it. 

Well, that rather begs the question of how much Java one needs to know.

You have to know as much Java as you need to know, in other words?

>  Sadhna Upadhyay wrote:
>
>> i everybody,
>>            haw much java [sic] knowledge is required for android [sic], actually i [sic]
>> have very little knowledge about java [sic].

Check out the Java tutorials. The initial ones won't take you long to work 

through and it will give you a flavor of how hopeless you are. The chapter 

titles on the rest will be instructive. 

Indeed, you should know the collections classes rather well. You should 

understand and be competent in concurrent programming. You should be 

able to write a Java program that doesn't crash. You should know why

(Assume there exists your own 'Foo' class defined accordingly.)

  Map<String, Foo> fooferol = new HashMap<String, Foo>();

  Foo foo = new Foo();

  foo.setName("Fred");

  fooferol.put("Fred", foo);

  foo.setName("Francine");

  fooferol.put("Francine", foo);

  for (String name : fooferol.keySet())

  {

    System.out.println(name +": "+ fooferol.get(name));

  }

works the way it does. 

(You'll need to add more code to make that compilable and runnable.)

-- 

Lew

--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en