Please I need help implementing this code in java

package csc$311$;

import java.util.Comparator;

import net.datastructures.$*$;

$/**$

$*$ A Adaptable PriorityQueue based on an heap.

$*$

$*$ Course:

$*$ Assignment:

$*$ @author

$*/$

public class HeapPQ implements AdaptablePriorityQueue $\{$

$/*$ use default comparator, see DefaultComparator.java $*/$

public HeapPQ$()\{$

$//$TODO: implement this method

$\}$

$/*$ use specified comparator $*/$

public HeapPQ$($Comparator c$)\{$

$//$TODO: implement this method

$\}$

$/*$

$*$ Return the data array that is used to store entries

$*$ This method is purely for testing purpose of auto$-$grader

$*/$

Object$[]$ data$()\{$

$//$TODO: replace the line below to return the actual array

return null;

$\}$

$/**$

$*$ The entry should be bubbled up to its appropriate position

$*$ @param int move the entry at index j higher if necessary, to restore the heap property

$*/$

public void upheap$($int j$)\{$

$//$TODO: implement this method

$\}$

$/**$

$*$ The entry should be bubbled down to its appropriate position

$*$ @param int move the entry at index j lower if necessary, to restore the heap property

$*/$

public void downheap$($int j$)\{$

$//$TODO: implement this method

$\}$

@Override

public int size$()\{$

$//$ TODO Auto$-$generated method stub

return $0$;

$\}$

@Override

public boolean isEmpty$()\{$

$//$ TODO Auto$-$generated method stub

return false;

$\}$

@Override

public Entry insert$($K key, V value$)$ throws IllegalArgumentException $\{$

$//$ TODO Auto$-$generated method stub

return null;

$\}$

@Override

public Entry min$()\{$

$//$ TODO Auto$-$generated method stub

return null;

$\}$

@Override

public Entry removeMin$()\{$

$//$ TODO Auto$-$generated method stub

return null;

$\}$

@Override

public void remove$($Entry entry$)$ throws IllegalArgumentException $\{$

$//$ TODO Auto$-$generated method stub

$\}$

@Override

public void replaceKey$($Entry entry, K key$)$ throws IllegalArgumentException $\{$

$//$ TODO Auto$-$generated method stub

$\}$

@Override

public void replaceValue$($Entry entry, V value$)$ throws IllegalArgumentException $\{$

$//$ TODO Auto$-$generated method stub

$\}$

$\}$