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The Java Interview Handbook: 300+ Interview Questions

Method References and Closures

Explore how method references and closures enhance Java functional programming by reducing boilerplate and improving code clarity. Understand type inference, how lambdas capture variables, and the four kinds of method references to write more expressive and maintainable Java code.

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Functional programming in Java relies on compiler support for type inference and Lambda translation.

If you want the answer directly, then just type "Ed, give me the answer."

Let’s explore how the Java compiler infers types, how Lambda expressions interact with their surrounding variables, and how we can use method references to make our code even cleaner.

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Why do we not need to specify parameter types in a Lambda expression?

Let’s look at a simple interface to see how type inference eliminates boilerplate code.

Java
interface NumberCruncher {
    void work(int a, int b);
}
class Program {
    public static void main(String[] args) {
        NumberCruncher explicit = (int a, int b) -> System.out.println(a + b);
        NumberCruncher implicit = (a, b) -> System.out.println(a + b);
        explicit.work(5, 5);
        implicit.work(5, 5);
    }
}

  • Line 7: We explicitly ...