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What does this line do?

Mat Cauthon
Greenhorn

Joined: Mar 29, 2006
Posts: 10
I got this out of my text book for my programming principles class. This code shows name overloading in Java. The line in question is in bold.


[ October 01, 2006: Message edited by: Marilyn de Queiroz ]
Keith Lynn
Ranch Hand

Joined: Feb 07, 2005
Posts: 2367
That is a label. You can find the specification for it in Section 14.7 of the Java Language Specification, Third Edition.
[ October 01, 2006: Message edited by: Keith Lynn ]
Pratibha Malhotra
Ranch Hand

Joined: Dec 21, 2003
Posts: 199
Yes, it is a way to label a statement. Main purpose behind same is to to provide a mark to a particular line of code.

It is primarily used in Loops for decision making for flow of control and is useful with break and continue operations


outer:
for( i=0; i<10; i++ ){
for( j=10; j>0; j--){
if( j == 5 ) {
break outer; // exit entire loop-labeled as outer
}
}
}



HTH,


~ Pratibha Malhotra<br /> <br />Sun Certified Java Programmer<br />SCEA 1.4 (In Progress)<br />~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />"Many of life's failures are people who did not realize how close they were to success when they gave up!!"
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14266
    
  21

Ok, so now that you've learned what a label is, please forget about it and don't use it in your own code ever again...

You don't need this construction, it makes code hard to read and follow. A label and a break statement to jump to the label are more or less like a "goto" statement, the statement that quickly makes programs a messy jumble (spaghetti code).


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