Java hashCode() Method
Java String ClassThe hashCode() method is used to return the hash code of a string.
The hash code of a string object is calculated according to the following formula:
s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]
Using int arithmetic, where s[i] is the ASCII code of the i-th character of the string, n is the length of the string, and ^ denotes exponentiation. The hash value of an empty string is 0.
Syntax
public int hashCode()
Parameters
- None.
Return Value
Returns the hash code value of the object.
Example
Example
public class Test {
public static void main(String args[]) {
String Str = new String("www.example.com");
System.out.println("The hash code of the string is:" + Str.hashCode() );
}
}
public static void main(String args[]) {
String Str = new String("www.example.com");
System.out.println("The hash code of the string is:" + Str.hashCode() );
}
}
The output from the above program is:
字符串的哈希码为 :321005537
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