Please help me implement this method! UTF$8.$java doesn't need to fixed but the methods I wrote do need to be used with the method I need help on$.$ Thanks!

UTF$8.$java:

import java.util.Arrays;

public class UTF$8\{$

public static void main$($String$[]$ args$)\{$

System.out.println$($testByteCount$($false$))$;

System.out.println$($testToBytes$($false$))$;

$\}$

$/**$

$*$ Returns the number of bytes that are used

$*$ to encode a code point when using UTF$-8.$

$*$

$*$ @param codePoint

$*$ @return the number of bytes that encode codePoint in UTF$-8$

$*/$

public static int byteCount$($int codePoint$)\{$

if $($codePoint $<0)\{$

return $0$;

$\}$

$//$ Four cases which return $1,2,3,$ and $4,$ respectively...

else if $($codePoint $<=0$x$7$F$)\{$

return $1$;

$\}$ else if $($codePoint $<=0$x$7$FF$)\{$

return $2$;

$\}$ else if $($codePoint $<=0$xFFFF$)\{$

return $3$;

$\}$ else if $($codePoint $<=0$x$10$FFFF$)\{$

return $4$;

$\}$ else $\{$

return $0$; $//$ For large code points which cannot be encoded.

$\}$

$\}$

$/**$

$*$ Returns the bytes that are used

$*$ to encode a code point when using UTF$-8.$

$*$

$*$ @param codePoint the code point to encode

$*$ @return the bytes that encode codePoint in UTF$-8$

$*/$

public static byte$[]$ toBytes$($int codePoint$)\{$

$//$ Calculates the number of bytes required

int count $=$ byteCount$($codePoint$)$;

byte$[]$ b $=$ new byte$[$count$]$;

$//$ If the code point only requires one byte, we can store the code point directly into the byte array b

if $($count $==1)\{$

b$[0]=($byte$)$ codePoint;

$\}$

$//$ If the code point requires more than one byte, we will iteratively fill the byte array b

else $\{$

for $($int i $=$ count $-1$; i $>0$; i$--)\{$

b$[$i$]=($byte$)(0$x$80|($codePoint & $0$x$3$F$))$;

codePoint $>>=6$;

$\}$

$//$ Since we are dealing with $4$ cases...

switch $($count$)\{$

case $2$:

b$[0]=($byte$)(0$xC$0|$ codePoint$)$;

break;

case $3$:

b$[0]=($byte$)(0$xE$0|$ codePoint$)$;

break;

case $4$:

b$[0]=($byte$)(0$xF$0|$ codePoint$)$;

break;

$\}$

$\}$

return b;

$\}$

Method I need help on:

$/*$

There's a method called Help.UTF$16$BE$\_$to$\_$UTF$8.$ Its signature is

public static byte$[]$ UTF$16$BE$\_$to$\_$UTF$8($byte$[]$ bytes$).$

It converts the bytes used to encode a collection of unicode characters in UTF$-16$BE

to the bytes used to encode the same collection of unicode characters un UTF$-8.$

It uses the methods you defined in UTF$8.$java. Therefore, to perform correctly,

it requires you to have completed the first part of the HW$.$

$.$ Use this method to make 'bytes' reference a new array of bytes ready for writing.

$.$ Open an output filestream. If a FileNotFoundException is thrown,

say to the user... $"\{$output filename$\}$ could not be opened for writing.

Make sure that you did not specify the name of a directory."

$*/$

$/**$

$*$ Converts the bytes used to encode a collection of Unicode characters in UTF$-16$BE to the bytes used to encode the same collection of Unicode characters in UTF$-8.$

$*$

$*$ @param bytes The bytes to convert.

$*$ @return The converted bytes.

$*/$

public static byte$[]$ UTF$16$BE$\_$to$\_$UTF$8($byte$[]$ bytes$)\{$

$//$ TODO: Implement this method using the methods you defined in UTF$8.$java

$//$ Hint: You can use a ByteBuffer to convert the bytes from UTF$-16$BE to UTF$-16$LE$,$ then from UTF$-16$LE to UTF$-8.$

$//$ Make sure to handle the case where the input bytes are not a valid UTF$-16$BE encoded file.

throw new UnsupportedOperationException$("$Not implemented yet"$)$;

$\}$

$\}$