Writing Functional Interfaces in Java

In this article, we will highlight the purpose and usability of a functional interface in comparison with several alternatives. We will look at how to evolve the code from its basic and rigid implementation to a flexible implementation based on a functional interface. For this, let's consider the following  Melon  class:

Java

 

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public class Melon {

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  private final String type;  

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  private final int weight;

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  private final String origin;

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  public Melon(String type, int weight, String origin) {

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    this.type = type;

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    this.weight = weight;

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    this.origin = origin;

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  }

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  // getters, toString(), and so on omitted for brevity

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}

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