Vector : Java Glossary

Vector

An array that automatically grows. Now replaced by ArrayList. You would only use Vector only for compatibility with Java 1.1.

Vector.add( elt ) automatically tacks on the end.

Thread Safety	Vectors In Mathematics
Old and New method names	Learning More
ArrayIndexOutOfBoundsException	Links
Vectors In Graphics

Thread Safety

To get the thread safety of Vector in ArrayList wrap it like

// making an ArrayList threadsafe
ArrayList a = new ArrayList( 100 );
Collection threadSafeList = Collections.synchronizedCollection( a );

Old and New method names

ArrayIndexOutOfBoundsException

Vector will often give you ArrayIndexOutOfBoundsException. There are many ways to generate one.

Using a negative index.
Indexing past the current end of the Vector with elementAt, get, setElementAt or set. It will only automatically grow with addElement or add, and it will grow only one element at a time. It won’t even let you use setElementAt or set one element past the end.
Doing a lastIndexOf starting out past the end.

Vectors In Graphics

In the context of graphic image processing there are two basic types: raster graphics and vector graphics. Raster graphics store the colour of a dot called a pixel for every tiny cell of the image. Vector graphics store the begin and end points of lines used to construct an image at any scale. Vector graphics also typically handle Bezier curves, which are curves that go through sample points, with the direction and curvature adjusted at each point to smooth the curve.

Vectors In Mathematics

In mathematics, a vector is a something with both a quanity and a direction, e.g. velocity or a force. A vector is also a tuple of numbers. Three numbers can be used to represent a direction in 3D. four numbers can represent a point in space-time.

Learning More

Oracle’s Javadoc on Vector class : available:

on the web at Oracle.com
in the current JDK 1.7.0_17 or in the old JDK 1.6.0_45 on your local Windows J: drive.

ArrayList
Enumeration
Gimp
Iterator
pixel
SVG

	available on the web at:	http://mindprod.com/jgloss/vector.html
	optional Replicator mirror of mindprod.com on local hard disk J:	J:\mindprod\jgloss\vector.html
	Please email your feedback for publication, letters to the editor, errors, omissions, typos, formatting errors, ambiguities, unclear wording, broken/redirected link reports, suggestions to improve this page or comments to Roedy Green : . If you want your message, your name or email kept confidential, not considered for public posting, please explicitly specify that. Unless you state otherwise, I will treat your message as a letter to the editor that I may or may not publish in the feedback section. After that, it will be too late to retract it. If you disagree with something I said, especially when sending an ad-hominem attack, a rant composed mainly of obscenities or a death threat, please quote the offending passage and cite the web page where you found it, tell me why you think it is wrong, and, if possible, provide some supporting evidence. I can’t very well fix erroneous or ambiguous text if I can’t find it.
Blog	Canadian Mind Products IP:[65.110.21.43] Your face IP:[107.22.127.92]
Feedback	You are visitor number 47,490.