Creating and Using Arrays in JAVA :

When a number of data items are chunked together into a unit, the result is a data (online) structure. Data structures can be very complex, but in many applications, the appropriate data structure consists simply of a sequence of data items. Data structures of this simple variety can be either arrays or records.

The term “record” is not used in Java. A record is essentially the same as a Java object that has instance variables only, but no instance methods. Some other languages, which do not support objects in general, nevertheless do support records. The C programming language, for example, is not object-oriented, but it has records, which in C go by the name “struct.”

The data items in a record—in Java, an object’s instance variables—are called the fields of the record. Each item is referred to using a field name. In Java, field names are just the names of the instance variables.

The distinguishing characteristics of a record are that the data items in the record are referred to by name and that different fields in a record are allowed to be of different types.

Swing GUI Components :
The Swing toolkit includes a rich array of components: from basic components, such as buttons and check boxes, to rich and complex components, such as tables and text. Even deceptively simple components, such as text fields, offer sophisticated functionality, such as formatted text input or password field behavior. There are file browsers and dialogs to suit most needs, and if not, customization is possible. If none of Swing's provided components are exactly what you need, you can leverage the basic Swing component functionality to create your own.