조건문

if

package ch02;

public class IfExam {
    public static void main(String[] args) {
        int a = args.length;
        if ( a == 0 ) {
            System.out.println("명령할 매개변수 입력");
        } else if ( a == 1) {
            System.out.println("매개변수" + args[0] + "입니다");
        } else if ( a == 2 ) {
            System.out.println("매개변수" + args[0] + "," + args[1] + "입니다");
        } else  {
            System.out.println("2개까지");
        }
    }
}

switch

package ch02;
//월을 입력 받고 출력
public class SwitchExam {
    public static void main(String[] args) {
        int month = Integer.parseInt(args[0]);
        int day;

        switch (month){
            case 1: case 3: case 5: case 7: case 8: case 10: case 12:
                day = 31; break;
            case 4: case 6: case 9: case 11:
                day = 30; break;
            default: day = 28;
        }
        System.out.println(month +"월" + day + "일");
    }
}