Spring Framework in the Real World - Java

In the previous section, the steps required to use the IoC component of the Spring Framework were enumerated. Now, it's time to develop a real world example based upon these steps. The application we are going to develop will wrap the logic to calculate simple interest. The application will have the following files:

1. SimpleCalculatorBean.java – POJO that wraps the logic for calculating simple interest.

2. bean.xml – The configuration file that contains details about the POJO

3. Client.java – The client for the simple interest calculation

First comes the SimpleCalculatorBean.java. It is a simple Java Bean that has getters and setters for rate, years, and principle. It also contains the calculate method for calculating simple interest. Here is the code:

package org.me;

class SimpleInterestCalculatorBean{

float years;

float principle;

float rate;

SimpleInterestCalculatorBean(){

}

public void setYears(float years){

this.years=years;

}

public float getYears(){

return years;

}

public void setPrinciple(float principle){

this. principle = principle;

}

public float getPrinciple(){

return principle;

}

public void setRate(float rate){

this. rate=rate;

}

public float calculate(){

return (float)((principle*rate*years)/100);

}

public float getInterest(){

return calculate();

}

}