JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

Publish Your Article Here

Adapter Pattern in java


An adapter pattern helps two incompatible interfaces to work together. This is the real world definition for an adapter. The adapter design pattern is used when you want two different classes with incompatible interfaces to work together. Interfaces may be incompatible but the inner functionality should suit the need. The Adapter pattern allows otherwise incompatible classes to work together by converting the interface of one class into an interface expected by the clients.

There are many real world examples, the simplest example is power socket and plug. American plug would not fit to British socket, and viceversa. We use power adapter to fix this issue. The adapter design pattern works exactly similar to power adapter. Here is the UML structure for adapter pattern:

Lets take a simple example. In a factory, there is a automated furnance system. The furnance can be controlled only through temperature in fahrenheit format. But Furnance Regulatory systems gets tempareture in centigrade format. To fix this issue, we use adapter pattern.

FurnanceController class, which controls furnance temperature

package com.java2novice.dp.adapter;

public class FurnanceController {

	/**
	 * this method accepts heat in Fahrenheit format
	 * @param heatLevel
	 */
	public void changeFurnanceTemperature(int heatLevel){
		System.out.println("heat the furnance..");
	}
}

Adapter class, which converts temperature from centigrade format to fahrenheit format.

package com.java2novice.dp.adapter;

public class FurnanceControllerAdapter extends FurnanceController{

	/**
	 * this method access temperature only in centigrade format
	 * @param heatLevel
	 */
	public void controlFurnance(int heatLevel){
		// convert temperature from centigrade to fahrenheit formate
		heatLevel = (heatLevel - 32)*5/9;
		changeFurnanceTemperature(heatLevel);
	}
}

Regulatory system sample code:

package com.java2novice.dp.adapter;

public class FurnanceRegulatorySystem {

	public void regulateFurnanceTemperature(){
		/**
		 * here some lines of code gives temperature in centigrade format 
		 */
		FurnanceControllerAdapter fca = new FurnanceControllerAdapter();
		fca.controlFurnance(300);
	}
}
<< Previous Program | Next Program >>
blog comments powered by Disqus

Java design pattern examples

  1. Factory Pattern
  2. Abstract Factory Pattern
  3. Builder Design Pattern
  4. Prototype Pattern
  5. Adapter Pattern
  6. Composite Pattern
  7. Proxy Pattern
Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
Famous Quotations
When I do good, I feel good; when I do bad, I feel bad, and that is my religion.
-- Abraham Lincoln

About Author

Most Visited Pages

Other Interesting Sites

Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
Privacy Policy | Copyright © 2017 by Nataraja Gootooru. All Rights Reserved.