Miscellany

abstract class Cacheable {    Object _cached;   abstract Object retrieve();  Object get() { if (_object == null) _cached = retrieve(); return _cached;}  }class CacheableA {  A retrieve() { return retrieveA();}  String retrieveA() { return "asdfasdf";} }class CachableB {  B retrieve() { return retrieveB();}  Integer retrieveB() { return new Integer(42);}}public class Foo {  Cacheable _a = new CacheableA();  Cacheable _b = new CacheableB();  public String a() {     return a.get();  }  public Integer b() {      return b.get();  }}