while문 반복문
import java.util.Scanner;

public class homework_01 {
	public static void main(String[] agrs) {
		int i = 0;
		int num = 0;
		
		Scanner sc = new Scanner(System.in);
		
		System.out.print("몇 번 반복할까요? ");
		num = Integer.parseInt(sc.nextLine());
		
		while(i<num) {
			i++;
			System.out.println("Hello java");
		}
		
	}
}