Método RuleBasedCollator equals() en Java con ejemplo

El método equals() de la clase java.text.Collator se utiliza para comprobar si las dos strings especificadas son idénticas o no. 

Sintaxis:  

public boolean equals(String source,
                      String target)

Parámetro : este método toma dos strings entre las cuales se realizará la comparación.
Valor devuelto: si ambas strings son iguales entre sí, devolverá verdadero , de lo contrario , falso .
A continuación se muestran los ejemplos para ilustrar el método equals() :
Ejemplo 1:  

// Java program to demonstrate
// equals() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // Creating and initializing
            // RuleBasedCollator Object
            RuleBasedCollator col
                = new RuleBasedCollator("< a< b< c< d");
 
            // Creating an initializing
            // object for comparison
            String obj1 = "a";
 
            // Creating an initializing
            // Object for comparison
            String obj2 = "A";
 
            // compare both object
            // using equals() method
            boolean i = col.equals(obj1, obj2);
 
            // display result
            if (i)
                System.out.println(obj1
                                   + " is equal to "
                                   + obj2);
            else
                System.out.println(obj1
                                   + " is not equal to "
                                   + obj2);
        }
 
        catch (ParseException e) {
 
            System.out.println(e);
        }
    }
}

a is not equal to A

Ejemplo 2: 

// Java program to demonstrate
// equals() method
 
import java.text.*;
import java.util.*;
import java.io.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // Creating and initializing
            // RuleBasedCollator Object
            RuleBasedCollator col
                = new RuleBasedCollator("< a< b< c< d");
 
            // Creating an initializing
            // object for comparison
            String obj1 = "a";
 
            // Creating an initializing
            // Object for comparison
            String obj2 = "a";
 
            // compare both object
            // using equals() method
            boolean i = col.equals(obj1, obj2);
 
            // display result
            if (i)
                System.out.println(obj1
                                   + " is equal to "
                                   + obj2);
            else
                System.out.println(obj1
                                   + " is not equal to "
                                   + obj2);
        }
 
        catch (ParseException e) {
 
            System.out.println(e);
        }
    }
}

a is equal to a

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