Simple Factory mode Implementation subtraction method

Source: Internet
Author: User

1. Create an interface for the operation

 Public Interface operation {    // provides a method for calculating two numbers    double getresult (double num1,  Double  num2);}

2. Create a corresponding subtraction four implementation class

 public  class  addition implements  operation {//  Addition   @Override  public  double  getresult (double  num1, double   num2)    { return  num1+NUM2; }}
 public  class  minus implements  operation {//  subtraction   @Override  public  double  getresult (double  num1, double   num2)    { return  num1-NUM2; }}
 public  class  multiplication implements  operation {//  multiplication   @Override  public  double  getresult (double  num1, double   num2) { return num1*NUM2; }}
 Public class Implements Operation {// Division     @Override    publicdouble GetResult (  Doubledouble  num2) {        return num1/num2;    }}

3. Create a factory class

 Public classoperationfactory {//factory class for computers    /** Factory mode is the model of our most commonly used instanced objects!     * Replace new! with a factory method     * Although the amount of code has not decreased but increased the scalability of the program! */     Public StaticOperation Getoperation (String o) {operation Operation=NULL;// polymorphic        Switch(o) { Case"+": Operation=Newaddition ();  Break;  Case"-": Operation=Newminus ();  Break;  Case"*": Operation=Newmultiplication ();  Break;  Case"/": Operation=NewDivision ();  Break; }        returnoperation; }}

4. Create test class Run test results

 Public classFactorytest { Public Static voidMain (string[] args) {Scanner Scanner=NewScanner (; System.out.println ("Please enter the first number:"); DoubleNUM1 =Scanner.nextint (); System.out.println ("Please enter operator:"); String (); System.out.println ("Please enter a second number:"); Doublenum2 =Scanner.nextint (); //create an instance object of an operationOperation o =Operationfactory.getoperation (operation); //Output ResultsSystem.out.println (O.getresult (NUM1, num2)); }}

Simple Factory mode Implementation subtraction method

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.