[Java] 랜덤게임 만들기

// 1.Class Declaration;
// The code defines a class named 'RandomGame', which contains methods and variables
// to implement the number guessing game.

public class RandomGame {

// 2. Instance Variables;
// 'answer' This is an instance variable that will store the correct answer to the guessing game. It's initially set to -1.
// 사용자가 입력하는 변수는 반드시 전역변수여야 한다.
// 'sc' This is an instance of the 'Scanner' class, used for reading user input from the console.	
	
		int answer = -1;	
		Scanner sc = new Scanner(System.in);


// 3. 'getRandom' Method;
// This method generates a random number between 0 and 9 using the 'Random' class and stores it in the 'answer' variable.
		public void getRandom() {
			Random r = new Random(); //리턴타입 없이도, 전역변수라면 어떠한 메소드에서도 재정의할 수 있다.
			answer = r.nextInt(10);
		}
// 4. 'getNum' Method;
// This method reads an integer input from the user using the 'Scanner' and returns the user's input. 
		public int getNum() {
			int user = 0;
			user = sc.nextInt();
			return user;
		}

 

// 5. 'account(int user)' Method;
// This method takes the user's input as a parameter and compares it with the 'answer'.
// It returns a hint as a String, indicating whether the user's guess is correct or if they should guess higher or lower.
		 
		public String account(int user) {
			String hint = null;
			if(answer == user) {
				hint ="정답입니다.";
			}else if(answer > user) { //사용자가 입력한 값이 정답보다 작으면 높여라를 반환.
				hint ="높여라.";
			}else if(answer < user) { //사용자가 입력한 값이 정답보다 크면 낮춰라 반환.
				hint ="낮춰라.";
			}
			return hint;
		}
// 6. messagePrint(int user) Method;
// This method prints the hint returned by the 'account' method based on the user's input.
		public void messagePrint(int user) { //user = 5 복사
			System.out.println(account(user)); //24 -> 5를 쥐고간다. -> 높여라 출력
		}
// 7. main Method;
// main method is the entry point of the program.
// It creates an instance of the 'RandomGame' class, generates a random answer,
// and then asks the user to input a number.

		public static void main(String[] args) {
			RandomGame rg = new RandomGame();
			rg.getRandom();
			System.out.println("숫자 입력: ");
			for(int i=5; i > 0; i--) {
				int user = rg.getNum();
				rg.messagePrint(user);
		}
	}
}