구구단 (2739)

Java 11

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());

        br.close();

        StringBuilder sb = new StringBuilder();

        for (int i=1; i<10; i++) {
            sb.append(n + " * "+ i + " = " + (n*i));
            sb.append("\n");
        }

        System.out.print(sb);
    }
}