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Type:
Improvement
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Resolution: Won't Fix
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: None
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Labels:None
Object ids are used in maps and sets all over the place. It makes sense to cache the hash computation in a similar manor as the String.hashCode() method.
From String.java
public int hashCode() { int h = hash; int len = count; if (h == 0 && len > 0) { int off = offset; char val[] = value; for (int i = 0; i < len; i++) { h = 31*h + val[off++]; } hash = h; } return h; }