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CharBuffer equals() method in Java

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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


Last Updated : 20 Sep, 2018
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