What is the ByteBuffer compareTo() method in Java?
We can use the compareTo() method of the class java.nio.ByteBuffer to compare two buffers. We compare the two buffers by looking at their sequence of remaining elements lexicographically, without regard to the starting point of the buffers.
The
Byte.compare()method compares two bites in the same way.
Declaration
The ByteBuffer.compareTo() method can be declared as follows:
buff1.compareTo(buff2);
buff1: The first buffer, to be compared tobuff2.buff2: The second buffer, to be compared tobuff1.
Return value
The ByteBuffer.compareTo() method returns an integer such that:
- The return value is a positive integer if
buff1is greater thanbuff2. - The return value is 0 if
buff1is equal tobuff2. - The return value is a negative integer if
buff1is less thanbuff2.
Code
Consider the code snippet below, which demonstrates the use of the ByteBuffer.compareTo() method:
import java.nio.*;import java.util.*;public class main {public static void main(String[] args) {int n1 = 5;int n2 = 4;try {ByteBuffer buff1 = ByteBuffer.allocate(n1);buff1.put((byte)1);buff1.put((byte)4);System.out.println("buff1: " + Arrays.toString(buff1.array()));ByteBuffer buff2 = ByteBuffer.allocate(n2);buff2.put((byte)3);buff2.put((byte)4);System.out.println("buff2: " + Arrays.toString(buff2.array()));int foo = buff1.compareTo(buff2);System.out.println("\nbuff1 compareTo to buff2: " + foo);} catch (IllegalArgumentException e) {System.out.println("Error!!! IllegalArgumentException");} catch (ReadOnlyBufferException e) {System.out.println("Error!!! ReadOnlyBufferException");}}}
Explanation
- A
ByteBufferbuff1is declared in line 8. Two valuess are written tobuff1in lines 9-10. - A
ByteBufferbuff2is declared in line 13. Two valuess are written tobuff2in lines 14-15. - The
ByteBuffer.compareTo()method is used in line 18 to see ifbuff1andbuff2are equal. TheByteBuffer.compareTo()method returns apositive integer, which means thatbuff1is greater thanbuff2.
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