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www.recyclart.org/2012/12/aggregation-of-buttons-pigmenti...
Necklace made of buttons and electric wires.
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Bonellia macrocarpa subsp. macrocarpa are common in the lowland savanna in the vicinity of The Belize Zoo. They are regularly attacked by aggregations of Chromacris speciosa nymphs. Observed defoliation varies from minimal to a significant reduction of Bonellia macrocarpa leaves.
Go to Page 151 in the Internet Archive
Title: Nerve aggregation (an important neuropathic standpoint) and medical free paths (armamentaria, &c.), Vol. 3
Creator: Elliot-Blake, Hubert
Publisher: London : John Bale, Sons & Danielsson
Sponsor: Wellcome Library
Contributor: Wellcome Library
Date: 1913
Vol: Vol. 3
Language: eng
If you have questions concerning reproductions, please contact the Contributing Library.
Note: The colors, contrast and appearance of these illustrations are unlikely to be true to life. They are derived from scanned images that have been enhanced for machine interpretation and have been altered from their originals.
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Aggregation in Java allows us to provide a reference for one class within another class. In other words, it supports a one-way relationship and implements a HAS-A relation. This is in contrast to the java inheritance concept that supports IS-A relation.
When two classes have a HAS-A relation, we say it implements aggregation. One best example we can think of is "Employee has a Car". We say this is unidirectional since a car cannot have an employee and only an employee can have a car.
Before we understand this with an example, let see why we need to use aggregation.
Usage of Aggregation in java
- Provides reusability of code
- We can directly access the methods and variables of the reference class
- Implements HAS-A relation
Example of Aggregation
Let us see how we can implement "Employee has a Car" in java using the aggregation concept. We create 2 classes Car and Employee. In the Employee class, we create a reference to the Car class by creating an object. Hence using this car object we can access all the properties of the Car class. So the Employee class has a unidirectional relationship with the Car class that implements aggregation.
This is a realtime example of aggregation where the company can track which employees are coming in their own vehicle to provide vehicle pass.
class Car {
String carname;
String color;
String regno;
Car(String carname, String color, String regno) {
this.carname = carname;
this.color = color;
this.
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During the breeding season, the aggregations of Olive Ridley females
on some of their nesting beaches is immense, a phenomenon known as an
‘arribada’. Thousands of females may crawl up a section of a beach in
the course of 2-3 days. Each female may lay 2-3 clutches of eggs over
the season, participating in several arribadas during the breeding
months. Each time, her eggs are susceptible to almost immediate
harvest.
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