포문 printf

		for(int i=1;i<=5;i++) {
			for(int j=1;j<=5;j++) {
				System.out.printf("%d ", i);
			}
			System.out.println();
		}
		
		System.out.println();
		
		for(int i=1;i<=5;i++) {
			for(int j=1;j<=5;j++) {
				System.out.printf("%d ", j);
			}
			System.out.println();
		}
		
		System.out.println();

for문 printf

 

public static void main(String[] args) {
		
		for(int i=1;i<=9;i++) {
			for(int j=2;j<=4;j++) {
				System.out.printf("%d * %d = %2d \t", j, i, i*j);
			}
			System.out.println();
		}
		
	}

 

public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a, b, tmp;
		
		System.out.print("a, b 값을 입력하세요.> ");
		a = sc.nextInt();
		b = sc.nextInt();
		
		if(a<b)
		{
			tmp = a;
			a = b;
			b = tmp;
		}
		for(int i=1;i<=9;i++) {
			for(int j=a;j>=b;j--) {
				System.out.printf("%d * %d = %2d \t", j, i, i*j);
			}
			System.out.println();
		}
		sc.close();
	}

정렬할 땐 무조건 a, b, tmp (=order by 정렬) SQL 나오기 전에 

셀렉트 소트??