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

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true). If you want to check equality with equals () method in your class equal you have
Yes, StringBuilder does not override Object 's .equals () function, which means the two object references are not the same and the result is false. For StringBuilder, you could use s1.toString ().equals (s2.toString ()) For your edit, you're calling the == operator on two different String objects.

In Java, the == operator compares that two references are identical or not. Whereas the equals () method compares two objects. Objects are equal when they have the same state (usually comparing variables). Objects are identical when they share the class identity. For example, the expression obj1==obj2 tests the identity, not equality.

This is standard behaviour of the equals method in Java. Trying to use isEqual() similarly gives a compile error: System.out.println(LocalDate.of(2021, Month.MAY, 26).isEqual("2021-05-26")); The method isEqual(ChronoLocalDate) in the type LocalDate is not applicable for the arguments (String)

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.

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    • how to use equals method in java