I am learning GoF Java Design Patterns and I want to see some real life examples of them. Can you guys point to some good usage of these Design Patterns.(preferably in Java's core libraries).
Thank you
In Java 5 and above you have the foreach loop, which works magically on anything that implements Iterable:
for (Object o : list) {
doStuff(o);
}
However, Enumerable still does not implement Iterable, meaning that do iterate over an Enumeration you must do the following:
for(; e.hasMoreElements() ;) {
doStuff(e.getNextElement());
}
Does anyone know if there is a reason why Enumeration ...
Why can't I do:
Enumeration e = ...
for (Object o : e)
...
what is the exact different of both.. is using enumeration more benefit than using iterator..? can anyone elaborate.. any reference article would be appeciated
If enums are used from jdk1.5 onwards , what was the use of java.util.Enumeration interface
before jdk1.5 ? Can anybody help me explore this with an example please ?
Is it possible for me to convert a String to an equivalent value in an Enumeration, using Java.
I can of course do this with a large if-else statement, but I would like to avoid this if possible.
Given this documentation:
http://download.oracle.com/javase/1.4.2/docs/api/java/util/Enumeration.html
I am not too hopeful that this is possible without ifs or a case statement.
What's does Enumeration<?> mean?
Is there any way to represent the general generic?
I still have a question about Enumerations. Here's a quick sketch of the situation.
I have a class Backpack that has a Hashmap content with as keys a variable of type long, and as value an ArrayList with Items.
I have to write an Enumeration that iterates over the content of a Backpack. But here's the catch: in a Backpack, there can also be another Backpack. And the Enumeration should also be ...
I have a class that implements the Enumeration<T> interface, but Java's foreach loop requires the Iterator<T> interface. Is there an Enumeration to Iterator Adapter in Java's standard library?
Basic question here, can I put String variables into a position in a string array along with more text?
Here's what I'm trying to do
public static final String CAT_BUD_TAB = "CAT_BUD_TAB";
public static final String inI = "INSERT INTO ";
public static final String val = " VALUES ";
public static final String[] catInsertArray = new String[13];
catInsertArray[0] = inI + CAT_BUD_TAB + val + "...
I have a JSP page that receives an ArrayList of event objects, each event object contains an ArrayList of dates. I am iterating through the event objects with the following:
How can I iterate through the dateTimes ArrayList of each event object and print out each events date/times ?
