Java Object hashCode() is a native method and returns the integer hash code value of the object. NA. Syntax : public int hashCode() // This method returns the hash code value // for the object on which this method is invoked. The hash code for a String object is computed as − s[0]*31^(n - 1) + s[1]*31^(n - 2) + ... + s[n - 1] Using int arithmetic, where s[i] is the ith character of the string, n is the length of the string, and ^ indicates exponentiation.

Following is the declaration for java.lang.Integer.hashCode() method.
This method returns a hash code value for this object, equal to the primitive int value represented by this Integer object. The java.lang.Integer.hashCode() method returns a hash code for this Integer. This method must be overridden in every class which overrides equals() method. The general contract of hashCode() method is: Multiple invocations of hashCode() should return the same integer value, unless the object property is modified that is being used in the equals() method. Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no … Return Value. (The hash value of the empty string is zero.) a hash code value for this object, equal to the primitive int value represented by this Integer object. hashCode(int value) Method. Exception.

See Also: Object.equals(java.lang.Object) , System.identityHashCode(java.lang.Object) The hashCode() is a method of Java Integer Class which determines the hash code for a given Integer. By default, this method returns a random integer that is unique for each instance. NA. The java.lang.Integer.hashCode() method of Integer class in Java is used to return the hash code for a particular Integer . public int hashCode() Parameters. Hashcode value is mostly used in hashing based collections like HashMap, HashSet, HashTable….etc. Here is the syntax of this method − public int hashCode() This method is compatible with … Example Syntax: public int hashCode() Parameters : … Declaration. The hashCode(int value) is an inbuilt Java Integer Class method which determines a hash code for a given int value. It returns the hashcode value as an Integer. It overrides hashCode in class Object. Syntax.