02: OOP vs FP with Java example – Conversion strategy pattern

Posted on July 31, 2017 by

Java code to convert given input values from KM to Meter, Meter to Centimetres, etc. OOP approach using the strategy design pattern Step 1: Define an interface.

package com.oop.eg2;
public interface Converter<T> {
     T convert(T input);

package com.oop.eg2;

public interface Converter<T> {

T convert(T input);

Step 2: Define a generic “MyMetricConverter” that implements the “Converter”.

package com.oop.eg2;
import java.math.BigDecimal;
public abstract class MyMetricConverter implements Converter<Double> {
    
    @Override
    public Double convert(Double input) {
        BigDecimal result = BigDecimal.valueOf(input).multiply(BigDecimal.valueOf(getConversionRate()));
        return result.doubleValue();
    }
    
    abstract double getConversionRate();    
}

package com.oop.eg2;

import java.math.BigDecimal;

public abstract class MyMetricConverter implements Converter<Double> {

@Override

public Double convert(Double input) {

BigDecimal result = BigDecimal.valueOf(input).multiply(BigDecimal.valueOf(getConversionRate()));

return result.doubleValue();

}

abstract double getConversionRate();

}

Step…

02: OOP vs FP with Java example – Conversion strategy pattern

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