$15.$ Refer to the below code snippet and explain the purpose of length:

class example

$\{$

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

$\{$

int i;

int nums$[]=$ new int $[20]$;

int vals$[]=$ new int $[20]$;

for $($i $=0$; i $<$ nums.length; i$++)$

nums$[$i$]=$ i;

if$($nums$.$length $>=$ vals.length$)$

for$($i $=0$; i $<$ nums.length; i$++)$

vals$[$i$]=$ nums$[$i$]$;

for$($i $=0$; i $<$ vals.length; i$++)$

System.out.print$($vals$[$i$]+"")$;

$\}$

$\}$