El método equals() de java.nio.CharBuffer Class se usa para verificar si el búfer dado es igual o no a otro objeto.
Dos búferes de caracteres son iguales si, y solo si,
- Tienen el mismo tipo de elemento,
- Tienen el mismo número de elementos restantes, y
- Las dos secuencias de elementos restantes, consideradas independientemente de sus posiciones iniciales, son puntos
iguales.
Este método considera que dos elementos char ‘a’ y ‘b’ son iguales si (‘a’ == ‘b’) || (Char.isNaN(a) && Char.isNaN(b)). Los valores -0 y +0 se consideran iguales, a diferencia de Char.equals(Object).
Un búfer de caracteres no es igual a ningún otro tipo de objeto.
Sintaxis:
public boolean equals(Object ob)
Parámetros: este método toma el ob (el objeto con el que se va a comparar este búfer) como parámetro.
Valor devuelto: este método devuelve verdadero si, y solo si, este búfer es igual al objeto dado.
A continuación se muestran los ejemplos para ilustrar el método equals() :
Ejemplos 1:
// Java program to demonstrate
// equals() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer 1
int capacity1 = 10;
// Declaring the capacity of the CharBuffer 2
int capacity2 = 10;
// Creating the CharBuffer
try {
// creating object of Charbuffer 1
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity1);
// creating object of Charbuffer 2
// and allocating size capacity
CharBuffer cb2 = CharBuffer.allocate(capacity2);
// putting the value in Charbuffer 1
cb1.put('a');
cb1.put(2, 'b');
cb1.rewind();
// putting the value in Charbuffer 2
cb2.put('a');
cb2.put(2, 'b');
cb2.rewind();
// print the CharBuffer 1
System.out.println(" CharBuffer 1: "
+ Arrays.toString(cb1.array()));
// print the CharBuffer 2
System.out.println(" CharBuffer 2: "
+ Arrays.toString(cb2.array()));
// checking the equality of both CharBuffer
boolean cbb = cb1.equals(cb2);
// checking if else condition
if (cbb)
System.out.println("Both are equal");
else
System.out.println("Both are not equal");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Producción:
CharBuffer 1: [a,, b,,,,,,, ] CharBuffer 2: [a,, b,,,,,,, ] Both are equal
Ejemplos 2:
// Java program to demonstrate
// equals() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer 1
int capacity1 = 10;
// Declaring the capacity of the CharBuffer 2
int capacity2 = 5;
// Creating the CharBuffer
try {
// creating object of Charbuffer 1
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity1);
// creating object of Charbuffer 2
// and allocating size capacity
CharBuffer cb2 = CharBuffer.allocate(capacity2);
// putting the value in Charbuffer 1
cb1.put('a');
cb1.put(2, 'b');
cb1.rewind();
// putting the value in Charbuffer 2
cb2.put('a');
cb2.put(2, 'b');
cb2.rewind();
// print the CharBuffer 1
System.out.println(" CharBuffer 1: "
+ Arrays.toString(cb1.array()));
// print the CharBuffer 2
System.out.println(" CharBuffer 2: "
+ Arrays.toString(cb2.array()));
// checking the equality of both CharBuffer
boolean cbb = cb1.equals(cb2);
// checking if else condition
if (cbb)
System.out.println("Both are equal");
else
System.out.println("Both are not equal");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Producción:
CharBuffer 1: [a,, b,,,,,,, ] CharBuffer 2: [a,, b,, ] Both are not equal
Ejemplos 3:
// Java program to demonstrate
// equals() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the CharBuffer 1
int capacity1 = 10;
// Declaring the capacity of the CharBuffer 2
int capacity2 = 10;
// Creating the CharBuffer
try {
// creating object of Charbuffer 1
// and allocating size capacity
CharBuffer cb1 = CharBuffer.allocate(capacity1);
// creating object of Charbuffer 2
// and allocating size capacity
CharBuffer cb2 = CharBuffer.allocate(capacity2);
// putting the value in Charbuffer 1
cb1.put('a');
cb1.put(2, 'b');
cb1.rewind();
// putting the value in Charbuffer 2
cb2.put('a');
cb2.put(2, 'b');
cb2.put(3, 'c');
cb2.put(4, 'd');
cb2.rewind();
// print the CharBuffer 1
System.out.println(" CharBuffer 1: "
+ Arrays.toString(cb1.array()));
// print the CharBuffer 2
System.out.println(" CharBuffer 2: "
+ Arrays.toString(cb2.array()));
// checking the equality of both CharBuffer
boolean cbb = cb1.equals(cb2);
// checking if else condition
if (cbb)
System.out.println("Both are equal");
else
System.out.println("Both are not equal");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Producción:
CharBuffer 1: [a,, b,,,,,,, ] CharBuffer 2: [a,, b, c, d,,,,, ] Both are not equal