In this article, we will understand with a Java program on how to find hashCode of a String using Java 1.8 version

Already in one of the previous article, we discussed how to get hashCode of a String

Find hashCode of a String :

• hashCode() method of String
  • This String method is used to get hash code of the invoking string
• The hash code for a string object is computed as :- s[0]*31^(n-1) + s[1]*31^(n-2) + … + s[n-1] where,
  • s[i] –> is the i^th character of the string
  • n –> is the length of the string
  • ^ –> indicates exponentiation
• Note: The hash value of the empty string is zero (0)
• Method signature :- public int hashCode();

GetStringHashCode.java

package in.bench.resources.java8.string.methods;

import java.util.Arrays;
import java.util.List;

public class GetStringHashCode {

	public static void main(String[] args) {

		// test strings
		List<String> fruits = Arrays.asList(
				"Apples",
				"Melons",
				"Mangoes",
				"Grapes",
				"Cherrys"
				);


		// get hashCode of each strings
		fruits
		.stream()
		.peek(s -> System.out.print(s + "\t"))
		.map(String::hashCode)
		.forEach(System.out::println);
	}
}

Output:

Apples	1967772793
Melons	-1993919424
Mangoes	-1794867248
Grapes	2140951720
Cherrys	-1887545894

Related Articles:

• Java 8 – How to get a specific character from String ?
• Java 8 – How to check whether particular word/letter/sub-string is present in the String ?
• Java 8 – How to check whether particular String endsWith specific word/letter ?
• Java 8 – How to check whether particular String startsWith specific word/letter ?
• Java 8 – How to check whether a String is empty or not ?
• Java 8 – How to get length of a String ?
• Java 8 – How to convert a String into char[] Arrays ?
• Java 8 – How to convert a String into UpperCase String ?
• Java 8 – How to convert a String into LowerCase String ?
• Java 8 – How to remove leading and trailing whitespaces in a String ?
• Java 8 – How to replace a String with another String ?
• Java 8 – How to split a String based on delimiter ?
• Java 8 – How to convert primitive data-types into String ?
• Java 8 – How to join String[] Arrays elements using different delimiter ?
• Java 8 – How to join List of String elements using different delimiter ?
• Java 8 – How to find 1^st and last index of particular character/substring in a String ?
• Java 8 – How to get hashCode of a String ?
• Java 8 – How to get sub-string from a String ?

References:

• https://docs.oracle.com/javase/8/docs/api/java/lang/String.html
• https://docs.oracle.com/javase/8/docs/api/java/util/stream/Stream.html

Happy Coding !!
Happy Learning !!