유니티

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Hero : MonoBehaviour
{
    public Monster target2;
    public GameObject target;

    // Start is called before the first frame update
    void Start()
    {
        Debug.Log(this.target); //GameObject 클래스의 인스턴스
        this.Attack();
    }

    void Attack()
    {
        Debug.LogFormat("{0}을 공격 합니다.", this.target);
        
        //게임오브젝트에서 컴포넌트를 가져올 때
        var monster = this.target.GetComponent<Monster>();
        monster.Hit();

        //컴포넌트에서 부모 게임오브젝트를 가져올 때
        //GameObject go = monster.GetComponent<GameObject>();
        GameObject go = monster.gameObject;
        var mon2 = go.GetComponent<Monster>();
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Monster : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }
    public void Hit()
    {
        Debug.Log("피해를 받았습니다.");
    }
}