Writing a function inside the main method - Java

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

 public static int max(int num1, int num2) {
    int result;
    if (num1 > num2)
       result = num1;
    else
       result = num2;

    return result; 
  }
}

Can the method max be coded inside the main method?