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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}