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DoubleBuffer equals() method in Java with Examples

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

Two double 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 double elements a and b to be equal if (a == b) || (Double.isNaN(a) && Double.isNaN(b)). The values -0.0 and +0.0 are considered to be equal, unlike Double.equals(Object).

A double 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:

Example 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 DoubleBuffer 1
        int capacity1 = 10;
  
        // Declaring the capacity of the  DoubleBuffer 2
        int capacity2 = 10;
  
        // Creating the DoubleBuffer
        try {
  
            // creating object of Doublebuffer 1
            // and allocating size capacity
            DoubleBuffer db1 = DoubleBuffer.allocate(capacity1);
  
            // creating object of Doublebuffer 2
            // and allocating size capacity
            DoubleBuffer db2 = DoubleBuffer.allocate(capacity2);
  
            // putting the value in Doublebuffer 1
            db1.put(8.56F);
            db1.put(2, 9.61F);
            db1.rewind();
  
            // putting the value in Doublebuffer 2
            db2.put(8.56F);
            db2.put(2, 9.61F);
            db2.rewind();
  
            // print the DoubleBuffer 1
            System.out.println(" DoubleBuffer 1:  "
                               + Arrays.toString(db1.array()));
  
            // print the DoubleBuffer 2
            System.out.println(" DoubleBuffer 2:  "
                               + Arrays.toString(db2.array()));
  
            // checking the equality of both DoubleBuffer
            boolean dbb = db1.equals(db2);
  
            // checking if else condition
            if (dbb)
                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:

DoubleBuffer 1:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
 DoubleBuffer 2:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
both are equal

Example 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 DoubleBuffer 1
        int capacity1 = 10;
  
        // Declaring the capacity of the  DoubleBuffer 2
        int capacity2 = 5;
  
        // Creating the DoubleBuffer
        try {
  
            // creating object of Doublebuffer 1
            // and allocating size capacity
            DoubleBuffer db1 = DoubleBuffer.allocate(capacity1);
  
            // creating object of Doublebuffer 2
            // and allocating size capacity
            DoubleBuffer db2 = DoubleBuffer.allocate(capacity2);
  
            // putting the value in Doublebuffer 1
            db1.put(8.56F);
            db1.put(2, 9.61F);
            db1.rewind();
  
            // putting the value in Doublebuffer 2
            db2.put(8.56F);
            db2.put(2, 9.61F);
            db2.rewind();
  
            // print the DoubleBuffer 1
            System.out.println(" DoubleBuffer 1:  "
                               + Arrays.toString(db1.array()));
  
            // print the DoubleBuffer 2
            System.out.println(" DoubleBuffer 2:  "
                               + Arrays.toString(db2.array()));
  
            // checking the equality of both DoubleBuffer
            boolean dbb = db1.equals(db2);
  
            // checking if else condition
            if (dbb)
                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:

DoubleBuffer 1:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
 DoubleBuffer 2:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0]
both are not equal


Last Updated : 04 Dec, 2018
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