static
이라는 키워드로 정의public class Counter {
static int count;
public static void increment() {
count++;
}
public static void main(String[] args) {
System.out.println(Counter.count);
Counter.increment();
System.out.println(Counter.count);
Counter.increment();
System.out.println(Counter.count);
Counter.increment();
System.out.println(Counter.count);
}
}