Why use getters and setters in classes?

Question

Because I need to encapsulate the entire class, if, as a programmer, I know perfectly how to use that variable. I only see need for setters and getters that work the variable value, so:

void setCommand (string val)
{
    string ret = "";

    for (char it : val)
        ret += toupper(it);
    command = ret;
}

But what is the need to use setters or getters like this:

void setMoney (float val)
{
    money = val;
}
float getMoney ()
{
    return money;
}

Answer 1

Basically this is one of the concepts of object orientation, encapsulation, in which you can define your variable as private, and create the getter and Setter to be able to access it from another class

ex:

class Pessoa {
  String nome;
  public String getNome() {
    return this.nome;
  }
  public void setNome(String s) {
    this.nome = s;
  } 
}

Main class

class main() {
  public static void main(String[] args) {
    Pessoa pessoa = new Pessoa();
    pessoa.setNome("João");
    System.out.println(pessoa.getNome());
  }
}

In this situation I created the class Person and set within it a private variable of the type String called name, in which I want to access it outside the class Person, for this I created the Setter and getter var person, making it possible to access it in other classes

In the former I gave, I transferred it from the main class, created an object of the type Person, and set a name to it "John" from the method setNome() of the class Person, dps displayed a name that I passed the same on the screen through the method getNome()