RuleBasedCollator hashCode() method in Java with Example

Last Updated : 29 Mar 2025

The java.text.RuleBasedCollator class has a hashCode() function. The hashCode for this Collator object can be obtained using the RuleBasedCollator class.

Syntax:

Parameter: No parameters are accepted by this method.

Return Value: The hash code value is returned by this method in integer format.

Example 1:

A custom string comparison based on a specified rule is demonstrated using the Java code that is provided, which uses RuleBasedCollator. In other words, 'a' should come before 'b', 'b' before 'c', and so on. The rule defines this as "< a < b \ c \ d". With this rule, an object called RuleBasedCollator is created, and its hash code is obtained by calling the hashCode() method. To catch and display ClassCastException or ParseException in the event that the rule or typecasting is wrong, exception handling is implemented.

Implementation:

FileName: RuleBasedCollatorExample1.java

import java.text.*;
import java.util.*;
import java.io.*;
public class RuleBasedCollatorExample1 
{
	public static void main(String[] argv)
	{
		try {
			// Creating and initializing new simple rule
			String input = "< a < b < c < d";
			// Creating and setting up a 
			// new RuleBasedCollator object
			RuleBasedCollator col = new RuleBasedCollator(input);
			// utilizing the hashCode() function to
			// obtain this object's hashCode
			int hash_code = col.hashCode();
			System.out.println("The hashCode is given by :- " + hash_code);
		}
		catch (ClassCastException ex) 
		{
			System.out.println("The Exception thrown is given by : " + ex);
		}
		catch (ParseException ex) 
		{
			System.out.println("The Exception thrown is : " + ex);
		}
	}
}   

Output:

 
The hashCode is given by :- 1882448026

Example 2:

The Java code that is provided defines a custom string sorting rule using RuleBasedCollator. 'A' should appear before 'c' and 'b,' and 'c' and 'b' should be compared according to their natural sequence, according to the rule "< a < c & a < b." With this custom rule, a RuleBasedCollator object is produced. The object's hash code is then retrieved by the program using the hashCode() method, and it is printed. The code handles runtime exceptions like ClassCastException and ParseException, which are used to handle possible flaws in the rule format or type problems.

Implementation:

FileName: RuleBasedCollatorExample2.java

import java.text.*;
import java.util.*;
import java.io.*;
public class RuleBasedCollatorExample2 
{
	public static void main(String[] argv)
	{
		try {
			// Creating and initializing new simple rule
			String input = "< a < c & a < b";
			// Creating and setting up a 
			// new RuleBasedCollator object
			RuleBasedCollator col = new RuleBasedCollator(input);
			// utilizing the hashCode() function to
			// obtain this object's hashCode
			int hash_code = col.hashCode();
			System.out.println("The hashCode is given by :- " + hash_code);
		}
		catch (ClassCastException ex) 
		{
			System.out.println("The Exception thrown is given by : " + ex);
		}
		catch (ParseException ex) 
		{
			System.out.println("The Exception thrown is : " + ex);
		}
	}
}   

Output:

 
The hashCode is given by :- 2022902017

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