Answer by Karl Zimmerman for Java HashMap.containsKey() doesn't call equals()
As Abimaran Kugathasan noted, the HashMap implementation uses hash-buckets to efficiently look up keys, and only uses equals() to compare the keys in the matching hash-bucket against the given key....
View ArticleAnswer by Mot for Java HashMap.containsKey() doesn't call equals()
BTW, your equal method is most likely incorrect. In case LotWaferBean is overridden, your equals method will accept the subclass instance, but will your subclass also do?It better should...
View ArticleAnswer by bestsss for Java HashMap.containsKey() doesn't call equals()
Only if 2 hashCodes equal, equals() will be called during loop keys.this is the correct answer... or almost. Precisely, if 2 hash codes collide (being the same ensures they are bound to collide under...
View ArticleAnswer by 卢声远 Shengyuan Lu for Java HashMap.containsKey() doesn't call equals()
Only if 2 hashCodes equal, equals() will be called during loop keys.
View ArticleAnswer by Abimaran Kugathasan for Java HashMap.containsKey() doesn't call...
JVM checks the hashcode bucket of that object's hashcode, if there are more objects with the same hashcode, then only, the equals() method will be executed. And, the developer should follow correct...
View ArticleAnswer by LazyCubicleMonkey for Java HashMap.containsKey() doesn't call equals()
Try putting a breakpoint in hashCode().If the hashCode() of two objects in a map return the same number, then equals will be called to determine if they're really equal.
View ArticleJava HashMap.containsKey() doesn't call equals()
I have a hashmap:Map<LotWaferBean, File> hm = new HashMap<LotWaferBean, File>();LotWaferBean lw = new LotWaferBean();... //populate lwif (!hm.containsKey((LotWaferBean) lw)) { hm.put(lw,...
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