Easy data caching in Java using ArrayList and generic type.

Cache.java

public final class Cache<T> extends ArrayList<T> {
    
    protected T find(Predicate<T> predicate) {
        for(T value : this)
            if(predicate.test(value))
                return value;
        return null;
    }

}

MyExampleClass.java

public class Example {
  
    static class Person {
        String name;
        int age;
      
        public Person(String name, int age) {
            this.name = name;
            this.age = age;
        }
    }
  
    static class PersonCache extends Cache<Person> {}
  
}