What is the output of following code segment?

public class Test $\{$

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

char $r={?}^{\text{'}}{x}^{\text{'}}$;

if $)=={(}^{\text{'}}{z}^{\text{'}}$

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

else if$(r==\text{'}y\text{'})$

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

else if$(r==\text{'}x\text{'})$

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

$\}$

$\}$