Java hashCode() Method Explained

In Java, the hashCode() method can be used to calculate the hash value of an object. This method is defined in the Object class, so all Java objects can invoke it.

The hashCode() method returns an integer value that represents a unique identifier for an object. This value can be obtained by calling the hashCode() method of the object.

Here is an example using the hashCode() method:

String str = "Hello World";
int hashCode = str.hashCode();
System.out.println("HashCode: " + hashCode);

This code will output the hash value of the string “Hello World”.

It is important to note that the hashCode() method is not completely unique, different objects may have the same hash value. Therefore, when using hash values for object comparison, it is necessary to further utilize the equals() method for judgment.