The equals() method of java.nio.ByteBuffer class is used to check whether or not the given buffer is equal to another object.
Two byte 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.
A byte 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 ByteBuffer 1 int capacity1 = 5; // Declaring the capacity of the ByteBuffer 2 int capacity2 = 5; // Creating the ByteBuffer try { // creating object of ByteBuffer 1 // and allocating size capacity ByteBuffer bb1 = ByteBuffer.allocate(capacity1); // creating object of ByteBuffer 2 // and allocating size capacity ByteBuffer bb2 = ByteBuffer.allocate(capacity2); // putting the int to byte typecast value in ByteBuffer 1 bb1.put((byte)20); bb1.put((byte)30); bb1.put((byte)40); bb1.rewind(); // putting the value in ByteBuffer 2 bb2.put((byte)20); bb2.put((byte)30); bb2.put((byte)40); bb2.rewind(); // print the ByteBuffer 1 System.out.println(" ByteBuffer 1: " + Arrays.toString(bb1.array())); // print the ByteBuffer 2 System.out.println(" ByteBuffer 2: " + Arrays.toString(bb2.array())); // checking the equality of both ByteBuffer boolean b = bb1.equals(bb2); // checking if else condition if (b) System.out.println(" both are equal"); else System.out.println(" both are not equal"); } catch (IllegalArgumentException e) { System.out.println("Exception thrown : " + e); } catch (ReadOnlyBufferException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
ByteBuffer 1: [20, 30, 40, 0, 0] ByteBuffer 2: [20, 30, 40, 0, 0] 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 ByteBuffer 1 int capacity1 = 5; // Declaring the capacity of the ByteBuffer 2 int capacity2 = 3; // Creating the ByteBuffer try { // creating object of ByteBuffer 1 // and allocating size capacity ByteBuffer bb1 = ByteBuffer.allocate(capacity1); // creating object of ByteBuffer 2 // and allocating size capacity ByteBuffer bb2 = ByteBuffer.allocate(capacity2); // putting the int to byte typecast value in ByteBuffer 1 bb1.put((byte)20); bb1.put((byte)30); bb1.put((byte)40); bb1.rewind(); // putting the value in ByteBuffer 2 bb2.put((byte)20); bb2.put((byte)30); bb2.put((byte)40); bb2.rewind(); // print the ByteBuffer 1 System.out.println(" ByteBuffer 1: " + Arrays.toString(bb1.array())); // print the ByteBuffer 2 System.out.println(" ByteBuffer 2: " + Arrays.toString(bb2.array())); // checking the equality of both ByteBuffer boolean b = bb1.equals(bb2); // checking if else condition if (b) System.out.println(" both are equal"); else System.out.println(" both are not equal"); } catch (IllegalArgumentException e) { System.out.println("Exception thrown : " + e); } catch (ReadOnlyBufferException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
ByteBuffer 1: [20, 30, 40, 0, 0] ByteBuffer 2: [20, 30, 40] both are not equal
