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For each loop

 
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(Question Java Tiger)



concern the code in bold: i guess the method values() is executed once (at the beginning of the loop) and not every time a new value is assigned to variable kolom, because that would be a performance problem
 
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Values is only called once (in order to get at an Iterator).
 
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The values() method returns a Collection, and to iterate through that collection an Iterator is obtained from kolommen.values().iterator(). That's done only once, exactly as in the first part of a normal for loop:
 
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Originally posted by Barry Gaunt:
The values() method returns a Collection, and to iterate through that collection an Iterator is obtained from kolommen.values().iterator(). That's done only once, exactly as in the first part of a normal for loop:



that's exactly what my .class file looks like after i decompiled it (i thought too late about that option to verify my ideas (it's almost weekend so the brain is slowing down )
 
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