please help fix the errors in the code $//$ThreadDemo class extends Thread

class ThreadDemo extends Thread $\{$

private int start;

$//$ Starting value for countdown

private String name;

$//$Thread name

$//$ Constructor

public ThreadDemo$($int start String name$)\{$

this.start $=$ start;

this.name $=$ name;

$\}$

$//$ Override the run method to perform countdown

public void run$()\{$

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

System.out.println$($name $+"$: $"+$ i$)$;

try $\{$

Thread.sleep$(1)$;

$//$Adding slight delay to simulate processing time

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

System.out.println$($name $+"$ interrupted."$)$;

$\}$

$\}$

$\}$

$\}$

$//$ Main class with the main method

public class Main $\{$

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

$//$ Step $1$: Create new instances of ThreadDemo with different starting values

ThreadDemo T$1=$ new ThreadDemo$(1000,$ "Thread$-1")$;

ThreadDemo T$2=$ new ThreadDemo$(500,$ "Thread$-2")$;

$//$Step $2$: Start both ThreadDemo objects

T$1.$start$()$;

T$2.$start$()$;

$//$ Step $3$: Wait for both threads to finish using join

try $\{$

T$1.$join$()$;

T$2.$join$()$; $\}$catch $($InterruptedException e$)\{$

System.out.println$("$Interrupted$")$;

$\}$

$//$Step $4$: Print final message

System.out.println$("$FINISHED$")$;

$\}$

$\}$