Explain in the following code, how we can avoid race conditions.

class Counter

$\{$

int count;

public void increment$()$

$\{$

count$++$; $//$ count $=$ count $+1$

$\}$

$\}$

public class SyncDemo

$\{$

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

$\{$

Counter c $=$ new Counter$()$;

$//$ c$.$increment$()$;

$//$ c$.$increment$()$;

Thread t$1=$ new Thread$($new Runnable$()$

$\{$

public void run$()$

$\{$

for$($int i$=1$;i$<=20000$;i$++)$

$\{$

c$.$increment$()$;

$\}$

$\}$

$\})$;

Thread t$2=$ new Thread$($new Runnable$()$

$\{$

public void run$()$

$\{$

for$($int i$=1$;i$<=20000$;i$++)$

$\{$

c$.$increment$()$;

$\}$

$\}$

$\})$;

t$1.$start$()$;

t$2.$start$()$;

try $\{$

t$1.$join$()$;

$\}$ catch $($InterruptedException e$)\{$

$//$ TODO Auto$-$generated catch block

e$.$printStackTrace$()$;

$\}$

try $\{$

t$2.$join$()$;

$\}$ catch $($InterruptedException e$)\{$

$//$ TODO Auto$-$generated catch block

e$.$printStackTrace$()$;

$\}$

System.out.println$("$Count $"+$ c$.$count$)$;

$\}$

$\}$

wait$()$ operation

wait$($S$)\{$

while $($S $<=0)$

$//$ busy wait

S$--$;

$\}$

signal$()$ operation

signal$($S$)\{$

S$++$;

$\}$