Core Java Technology Section Index | Page 2

You're not alone here. JSR 310 is attempting to remedy this situation (http://www.jcp.org/en/jsr/detail?id=310). In the meantime, you can try out Joda time (http://joda-time.sourceforge.net/), wh...more

The first argument to the printf method is the formatting string. While this will typically display the string you want, if it includes something like a % in it, it won't and will try to interpret...more

Access Denied error in frames When I try to access a child frame from parent frame I get "Access Denied Error". I know the reason is because I am trying to access the frame in a different domain. I...more

Chet Haase at Sun claims "Java on Vista: Yes, it Works" at http://weblogs.java.net/blog/chet/archive/2006/10/java_on_vista_y.html. There is more said there than can be written here.more

The add() method returns a boolean. If the set did not previously contain the element, true is returned. If the set previoulsy did contain the element, false is returned. Of course, you can also c...more

Typically a Map maps a key to a single value. To have a multimap, the values of a Map should be a List instead. Thus there can be multiple values in the List associated with a single key.more

It depends on what you need to do. The remove() method of an Iterator is the safe way to remove elements from an underlying collection. You can't safely remove elements with a for-each loop. For j...more

Class<String> is the generics way of writing String.class. It allows you to improve type safety.

Class<String> is the generics way of writing String.class. It allows you to improve type safety.

A multimap is a map where a single key can map to multiple values.

A multimap is a map where a single key can map to multiple values. (And a value can be associated with multiple keys.)

Boolean.FALSE < Boolean.TRUE

Java SE v1.3.1_18 (and later) Java SE v1.4.2_11 (and later) Java SE 5.0 u6 (and later) Java SE 6 SE

Several methods of the collection interfaces are considered optional. If an unsupported operation is called, that is when you'll see the UnsupportedOperationException thrown. The javadoc for a col...more

My application is using the the classes from some jar file. I have made my application as jar and when I run my jar file I am getting the error "java.lang.NoClassDefFoundError:". These classes are ...more