[JAVA] 구구단 3단씩 출력(try-catch 사용)_01

public class MainClass02 {
	public static void main(String[] args) {
		MultiplicationTable start = new MultiplicationTable();
		start.inputValue();
		start.outputResult();
//		start.outputResult2();
	}
}

import java.util.Scanner;

public class MultiplicationTable {
	int input1, input2;

	void inputValue() {
		// void inputValue() throws Exception{
		int chk = 0;
		while (chk != 1) {
			try {
				// 입력
				Scanner in = new Scanner(System.in);
				System.out.print("first value : ");
				this.input1 = in.nextInt();
				System.out.print("second value : ");
				this.input2 = in.nextInt();

				// 예외 발생시키기
				if ((input1 > input2)) {
					throw new Exception("\n첫번째 값은 뒷자리보다 작은 수를 입력하시오.\n");
				} else if ((input1 > 9) || (input2 > 9)) {
					throw new Exception("\n9 미만의 수를 입력하시오.\n");
				}

				// 예외가 일어나지 않아야 밑으로 이동
				chk = 1;
			} catch (Exception e) {
				System.err.println(e.getMessage());
				// System.err.println(e);
			}
		}
	}

	void outputResult() {
		for (int dan = input1; dan <= input2; dan += 3) {
			for (int line = 1; line < 10; line++) {
				System.out.printf(dan > input2 ? " " : "%d x %d = %2d  ", dan,
						line, (dan * line));
				System.out.printf(dan + 1 > input2 ? " " : "%d x %d = %2d  ",
						dan + 1, line, ((dan + 1) * line));
				System.out.printf(dan + 2 > input2 ? "\n" : "%d x %d = %2d\n",
						dan + 2, line, ((dan + 2) * line));
			}
			System.out.println("");
		}
	}
}