Writing a function inside the main method - Java

Question

Can you write a method inside the main method? For example I found this code:

public class TestMax {
    public static void main(String[] args) {
    int i =         


        

Answer 1

Yes, this is possible by lembda expression: for that you should use at least java 8

import java.util.function.BiFunction;

public class TestMax {
    public static void main(String[] args) {
        BiFunction max = (a,b)-> a>b ? a : b;

        //now you can call method

        int i = 5;
        int j = 2;
        int k = max.apply(i, j);
        System.out.println("The maximum between is " + k);
    }
}

BiFunction is an functional interface java compiler internally converts lambda expression code as an anonymouse class which implements BiFunction interface and overrides apply() method which contains your code

Internal (compiler considered) code is:

BiFunction max = new BiFunction(){
    public Integer apply(Integer a, Integer b){
        return a>b ? a : b; //your code
    }
}