To implement a hash table, we should use the hash table class, which will map keys to the values. The key or values of the hash table should be a non-null object. In order to store and retrieve data from the hash table, the non-null objects, that are used as keys must implement the hashCode() method and the equals() method. Hashtable produces Never use the equals() method to compare BigDecimal instances. That is because this equals function will compare the scale. That is because this equals function will compare the scale. If the scale is different, equals() will return false, even if they are the same number mathematically. Since java.lang.String class override equals method, It returns true if two String object contains same content but == will only return true if two references are pointing to the same object. Here is an example of comparing two Strings in Java for equality using the == and equals() method which will clear some doubts:
What is the proper way to use a .equals method in Java? 2. Providing an alternative to equals()? 0. checking if something is equal to different things java. 2.
So the fastest way of comparing strings depends on: Whether your string objects are reused (like from a collection) or are always new (like from an input stream) Whether your strings differ at the start or the end of the string. Ignoring those facts, the majority of all programs will be fine with String.equals (). Issues with Overloaded Equals: All the Collections provided by Java ie; Set, List, Map use the overridden method for comparing two objects. So even if you overload the equals method, it doesn't solve the purpose of comparing two objects. Also, if you just overload and implement the hashcode method, it would result in erroneous behavior The reason lies in the default implementations of the equals () and hashCode () methods. By default, the equals () method checks for reference equality — whether the two objects are the same BrGksmX.
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    • how to use equals method in java