OOP its methods, parameters, how to figure it out?

Question

Java

There is a .length method , it is without brackets, there are methods where you just need to put brackets, for example
method() , there are methods where you need to set parameters method(1,2) .
Question: how to find out where to put brackets and where not, where to set method parameters, and where not.

Answer 1

First, length without parentheses is not a method, but a field. Secondly, you can find out where it is necessary to pass parameters, and where it is not necessary, in the documentation.

Answer 2

.length without brackets is not a method, but a property.
Go back to the beginning of the tutorial and carefully re-read about fields, methods, properties.

class Dog {
  name = 'Тузик' // поле (свойство) .name используется без скобок

  function getName() {  // метод, getName() возвращающий имя, со скобками.
    return this.name  
  }

  function move(x,y) { // метод перемещающий тузика, у него не просто скобки, туда в скобки еще координаты подставить нужно
     // ......
  }

}