newbie! Java classes and objects, correct class layout and invocation

Question

Java

I recently started learning OOP and Java. A pack of noob questions :)
We have a Main class in which the main program is processed, and two sub-classes Player / Location
Player class stores information, say, about players and their characteristics. As I understand correctly, first we set variables and default values ​​for the class.
Player.java

public class Player {
    public String characterName = "N/A";
    public String characterClass = "Paladin";
    public String characterSex = "Man";
    public int characterPlayedTime = 0;
    public int characterLevel = 1;
    public int characterDamage = 100;
}

It was we who created the Player class with such and such values.
Now I want to make in this Class an object - a specific player. How can I implement it correctly?
Would it be correct to write something like this inside the Player class:

public class Player {

    public String characterName = "N/A";
    public String characterClass = "Paladin";
    public String characterSex = "Man";
    public int characterPlayedTime = 0;
    public int characterLevel = 1;
   public int characterDamage = 100;

    public Player adept = new Player {
        public String characterName = "Adept";
        public String characterClass = "Rogue";
        public String characterSex = "Man";
        public int characterPlayedTime = 15;
        public int characterLevel = 30;
        public int characterDamage = 500;

    }

}

It is important for me to understand these basics. Since I was not connected with OOP before. Thank you!

Answer 1

I think you should first deal with such things as encapsulation

Answer 2

Sometimes it is required to create an object of a certain class with preset values, or to return some (I call them global) previously created object.
The first possibility is implemented in the class constructor:

public class Player {

    public String characterName = "N/A";
    public String characterClass = "Paladin";
    public String characterSex = "Man";
    public int characterPlayedTime = 0;
    public int characterLevel = 1;
   public int characterDamage = 100;

    public Player () {
        characterName = "Adept";
        characterClass = "Rogue";
        characterSex = "Man";
        characterPlayedTime = 15;
        characterLevel = 30;
        characterDamage = 500;
    }

}

... will create in each created new object the values ​​previously written in the constructor. Once created, they can be changed to others.
For the second case:

public class Player {

    public String characterName = "N/A";
    public String characterClass = "Paladin";
    public String characterSex = "Man";
    public int characterPlayedTime = 0;
    public int characterLevel = 1;
   public int characterDamage = 100;

    public static Player adept() {
        Player ret = new Player();
        ret.characterName = "Adept";
        ret.characterClass = "Rogue";
        ret.characterSex = "Man";
        ret.characterPlayedTime = 15;
        ret.characterLevel = 30;
        ret.characterDamage = 500;
     return ret;
    }
}

... a static function will return the object created in it, having previously assigned the necessary values ​​to the object's fields. They can also be changed.