Método RuleBasedCollator getCollationKey() en Java con ejemplo

El método getCollationKey() de la clase java.text.RuleBasedCollator se utiliza para convertir la serie de bits de la string que se le pasa.
Sintaxis: 
 

public CollationKey getCollationKey(String source)

Parámetro : este método acepta el objeto de string como parámetro.
Valor devuelto: este método devuelve la serie de bits convertidos a partir de la string que se le pasó.
A continuación se muestran los ejemplos para ilustrar el método getCollationKey() :
Ejemplo 1: 
 

// Java program to demonstrate
// getCollationKey() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // Creating and initializing
            // new simple rule
            String simple
                = "< a < b < c < d";
 
            // Creating and initializing
            // new RuleBasedCollator Object
            RuleBasedCollator col
                = new RuleBasedCollator(simple);
 
            // getting series of bits
            // using getCollationKey() method
            CollationKey key
                = col.getCollationKey("Geek");
 
            // display result
            System.out.println(
                "Series of bits are :- "
                + key.getSourceString());
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ParseException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

Series of bits are :- Geek

Ejemplo 2: 
 

// Java program to demonstrate
// getCollationKey() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // Creating and initializing
            // new simple rule
            String simple
                = "< a < b < c < d";
 
            // Creating and initializing
            // new RuleBasedCollator Object
            RuleBasedCollator col
                = new RuleBasedCollator(simple);
 
            // getting series of bits
            // using getCollationKey() method
            CollationKey key
                = col.getCollationKey("G_f_G");
 
            // display result
            System.out.println(
                "Series of bits are :- "
                + key.getSourceString());
        }
 
        catch (ClassCastException e) {
 
            System.out.println("Exception thrown : " + e);
        }
        catch (ParseException e) {
 
            System.out.println("Exception thrown : " + e);
        }
    }
}

Series of bits are :- G_f_G

Referencia: https://docs.oracle.com/javase/9/docs/api/java/text/RuleBasedCollator.html#getCollationKey-java.lang.String-