Integerous

interface PlayingCard {
  public static final int SPADE = 4;
  final int DIAMOND = 3; //public static final int DIAMOND = 3;
  static int HEART = 2;  //public static final int HEART = 2;
  int CLOVER = 1;        //public static final int CLOVER = 1;
  
  public abstract String getCardNumber();
  String getCardKind();  //public abstract String getCardKind();
}

Integerous

public class Vector extends AbstractList
              implements List, Cloneable, java.io.Serializable  {
    protected Object elementData[];
    ...
}

Integerous

void doWork(Car c) {
  if (c instanceof FireEngine){
    FireEngine fe = (FireEngine)c;
    fe.water();
    ...
  }else if ...
}

Integerous

Date today = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
String result = df.format(today); //오늘 날짜를 yyyy-MM-dd 형태로 반환