구구단 한 행에 3단씩 출력하기

public class Gugudan { public static void main(String[] args) { for(int i=1; i<10; i++) { if(i==1 || i==4 || i==7) { System.out.print(" "+i+"단\t\t\t"); System.out.print(" "+(i+1)+"단\t\t\t"); System.out.println(" "+(i+2)+"단"); } for(int j=1; j<10; j++) { System.out.print(i+" * "+j+" = "+i*j+"\t\t"); System.out.print(i+1+" * "+j+" = "+(i+1)*j+"\t\t"); System.out.print(i+2+" * "+j+" = "+(i+2)*j); System.out.println(); } i+=2; } } }