Java 8 – Lambda Expressions

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loveprogramming viết ngày 09/04/2021

https://grokonez.com/java/java-8-lambda-expressions

Java 8 – Lambda Expressions

Lambda expressions are new feature in Java 8. We now can represent one method interface by using an expression.

I. Overview

1. Pass a method as argument

Assume that we have 2 math operations: addition and subtraction. Those operations will be chosen in specific cases with 2 numbers: a and b. So the math operation is considered as an argument to method:

int doMathOperation(int a, int b, MathOperation mathOperation) {...}

To make thing done, in normal approach, we declare an interface:

public interface IMathOperation {
    int run(int a, int b);
}

and two implementations:

public class Addition implements IMathOperation {

    @Override
    public int run(int a, int b) {
        return (a + b);
    }
}

public class Subtraction implements IMathOperation {

    @Override
    public int run(int a, int b) {
        return (a - b);
    }
}

Main function will be:

int doMathOperation(int a, int b, IMathOperation mathOperation) {
   return mathOperation.run(a, b);
}

More at:

https://grokonez.com/java/java-8-lambda-expressions