public class HelloWorld {

public static void main(String[] args) {

int one = 21 ;

    if (one%2==0){

    String res = "偶数";

   }else{

    String res = "奇数";

   System.out.println("one是"+res);

    }

}

}

public class HelloWorld {

    public static void main(String[] args) {

int one = 21 ;

   if (one%2==0){

      System.out.println("one是偶数“);      

}

 else{

         System.out.println("one是奇数“);  

}

}

}