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lastIndexOf() Question

Sam Bluesman
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Joined: Nov 21, 2004
Posts: 191
If i have an array of integers called, say, integerArray[], and i am looking for the last location that contains, say, 1, then how do i use the lastIndexOf() method, as it does not seem to work when i try it.

my code is similar to:



Thanks
[ November 13, 2005: Message edited by: Sam Bluesman ]

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Rob Spoor
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Joined: Oct 27, 2005
Posts: 19720
    
  20

Arrays don't have methods and have only 1 field, length.
java.util.Arrays has some utility methods for arrays, but no lastIndexOf, so you'll have to write your own utility class that implements it. Just traverse the array backwards, starting at intArray.length - 1.


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Ilja Preuss
author
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Joined: Jul 11, 2001
Posts: 14112
Or use the ArrayUtils class from http://jakarta.apache.org/commons/lang/


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Ernest Friedman-Hill
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Joined: Jul 08, 2003
Posts: 24187
    
  34

Originally posted by Rob Spoor:
Arrays don't have methods


Actually they have all the methods of the class java.lang.Object: equals(), hashCode(), wait(), notify(), notifyAll(), toString(), finalize(), getClass(), and clone() (which is public in all array classes.)


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Rob Spoor
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Joined: Oct 27, 2005
Posts: 19720
    
  20

Right, stupid of me. Since arrays are Objects of course they have these...
Campbell Ritchie
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Joined: Oct 13, 2005
Posts: 39409
    
  28
Is lastIndexOf() in the ArrayList class, maybe?
Rob Spoor
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Joined: Oct 27, 2005
Posts: 19720
    
  20

In all Lists.
 
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