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CharBuffer equals() method in Java

  • Last Updated : 20 Sep, 2018

The equals() method of java.nio.CharBuffer Class is used to check whether or not the given buffer is equal to another object.

Two char buffers are equal if, and only if,

  • They have the same element type,
  • They have the same number of remaining elements, and
  • The two sequences of remaining elements, considered independently of their starting positions, are pointwise
    equal.

This method considers two char elements ‘a’ and ‘b’ to be equal if (‘a’ == ‘b’) || (Char.isNaN(a) && Char.isNaN(b)). The values -0 and +0 are considered to be equal, unlike Char.equals(Object).

A char buffer is not equal to any other type of object.

Syntax:



public boolean equals(Object ob)

Parameters: This method takes the ob(The object to which this buffer is to be compared) as a parameter.

Return Value: This method returns true if, and only if, this buffer is equal to the given object.

Below are the examples to illustrate the equals() method:

Examples 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");
        }
    }
}
Output:
CharBuffer 1: [a,, b,,,,,,, ]
 CharBuffer 2: [a,, b,,,,,,, ]
Both are equal

Examples 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");
        }
    }
}
Output:
CharBuffer 1: [a,, b,,,,,,, ]
 CharBuffer 2: [a,, b,, ]
Both are not equal

Examples 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");
        }
    }
}
Output:
CharBuffer 1: [a,, b,,,,,,, ]
 CharBuffer 2: [a,, b, c, d,,,,, ]
Both are not equal

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