Example class for medium OOP post.

Agent.java

//name of class
public class Agent {
    private String name;
    private Integer heightInCM;

    //default constructor
    public Agent() {
        this.name = "Smith";
        this.heightInCM = 177;
    }
    //second constructor
    public Agent(String name, Integer heightInCM) {
        this.name = name;
        this.heightInCM = heightInCM;
    }
    //accessor methods
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getHeightInCM() {
        return heightInCM;
    }

    public void setHeightInCM(Integer heightInCM) {
        this.heightInCM = heightInCM;
    }

    //public interface of class
    public void fight() {
        fightImplementation();
    }
    //private implementation of class
    private void fightImplementation() {
        //implementation of fight
    }
}