There are techniques for creation of objects (read allocation of memory)
widely known as lazy Instantiation and Eager Instantiation.
Lazy instantiation is a memory conservation technique, by which, a program
delays the creation of objects until those objects are needed.
In Java, there are two categories of lazy instantiation:
1. Lazy class loading
The Java runtime loads classes into memory only when they're first
referenced.
This may happen due to a first call to a static method of a class as in:
aClass.someStaticMethod();
or a first call to the "new" operator to create an instatnce of a class as
in:
AClass aClass = new AClass();
This is a very important feature of the Java runtime. Memory usage can be
significantly reduced. For example, if a part of a program is never run,
classes that are only referenced by that part of the program will never be
loaded.
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