Can you help me fix the errors?

$/*********************************************************************$

$*$

$*$ METHODS TO BE COMPLETED

$*$

$*$

$************************************************************************/$

$/**$ Check to see if two bags are equals.

$*$ @param aBag Another object to check this bag against.

$*$ @return True the two bags contain the same objects with the same frequencies.

$*/$

public boolean equals$($ArrayBag aBag$)\{$

boolean result $=$ true;

T$[]$ t $=$ toArray$()$;

T$[]$ s $=$ aBag.toArray$()$;

for$($int i $=0$; i $$ t$.$length; i$++)\{$

for$($int j $=0$; j $$ s$.$length; j$++)\{$

if$($s$[$j$]!=$ null && s$[$j$].$equals$($t$[$i$]))\{$

t$[$i$]=$ null;

s$[$j$]=$ null;

$\}$

$\}$

$\}$

for$($int i $=0$; i $$ numberOfEntries; i$++)$

if$($t$[$i$]!=$ null$)$

result $=$ false;

for$($int i $=0$; i $$ aBag.numberOfEntries; i$++)$

if$($s$[$i$]!=$ null$)$

result $=$ false;

$//$ COMPLETE THIS METHOD

return result;

$\}$

$//$ end equals

$/**$ Duplicate all the items in a bag.

$*$ @return True if the duplication is possible.

$*/$

public boolean duplicateAll$()\{$

checkIntegrity$()$;

boolean success $=$ false;

if$($numberOfEntries $*2>$ bag.length$)$

return success;

for$($int i $=0$; i $$ numberOfEntries; i$++)$

bag$[$i $+$ numberOfEntries$]=$ bag$[$i$]$;

success $=$ true;

$//$ COMPLETE THIS METHOD

return success;

$\}//$ end duplicateAll

$/**$ Remove all duplicate items from a bag

$*/$

public void removeDuplicates$()\{$

checkIntegrity$()$;

if$($numberOfEntries

return;

for$($int i $=0$; i $$ numberOfEntries $-1$; i$++)\{$

for$($int j $=$ i $+1$; j $$ numberOfEntries; j$++)\{$

if$($bag$[$i$].$equals$($bag$[$j$]))\{$

remove$($bag$[$j$])$;

j$--$;

$\}$

$\}$

$\}$

return;

$\}//$ end removeDuplicates

$\}//$ end ArrayBag