Java String hashCode Example

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String class hashCode method example String class hashCode method example:- This example demonstrates the working of hashCode method. this method returns corresponding hashCodes of objects value passed. Syntax:-hashCode() Here is the code:- /** * @(#) HashCodeString.java * HashCodeString class demonstrates the working of hashCode() method of String class of lang package */ public class HashCodeString { public static void main(String args[]) { // hashCode method generates hash codes repersentations of only objects // values // arithmetically hash Codes of numbers are generated as follows // s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1] // here i is any character value or number value of the object, // n is .length method value of the object say String, and ^ denotes // exponentiation. // The hash value of the empty string is zero Integer j = new Integer(10); Long k = new Long(10); Integer v = new Integer(0); // here value types don't match therefore methos returns false System.out.println("false is returned: " + j.equals(k)); // hash codes of different objects with same value are always same System.out.println("Hash code of number 10 is: " + j.hashCode() + "\nHash code of number 10 is: " + k.hashCode()); // corresponding hash code value of number zero(0) is zero(0) System.out.println("Method returns zero: " + v.hashCode()); String baadshah = "latter in time there will be my empire every where"; // hashCode representation of the value ofobject 'baadshah' // every object has its own hash code representation of their values // every value of any object consists of unique hash codes System.out.println("Corresponding hash code value returned is: " + baadshah.hashCode()); } } Output of the program:- ------------------------------- false is returned: false Hash code of number 10 is: 10 Hash code of number 10 is: 10 Method returns zero: 0 Corresponding hash code value returned is: 342164105