用HashSet的add方法谈hashcode和equals方法重写

Set<UnlockGood> unlockgoods = new HashSet<UnlockGood>(); UnlockGood good = new UnlockGood("a",1,2); unlockgoods.add(good); UnlockGood good1 = new UnlockGood("a",1,12); unlockgoods.add(good1); UnlockGood good2 = new UnlockGood("b",1,2); unlockgoods.add(good2);