The exercise $-$ get the tests to pass!

Explore using an inner class ExpirableEntry

Try not using built in collection classes; Lists, Maps, or Sets.

Try both Java and Kotlin examples.

package io$.$collective;

import java.time.Clock;

public class SimpleAgedCache $\{$

public SimpleAgedCache$($Clock clock$)\{$

$\}$

public SimpleAgedCache$()\{$

$\}$

public void put$($Object key, Object value, int retentionInMillis$)\{$

$\}$

public boolean isEmpty$()\{$

return false;

$\}$

public int size$()\{$

return $0$;

$\}$

public Object get$($Object key$)\{$

return null;

$\}$

$\}$