构造器和静态属性的测试

import java.util.Calendar;

public class Test {
  public static final Test INSTANCE = new Test();

  private int size = 6;

  private static int THIS_YEAR = Calendar.getInstance().get(Calendar.YEAR);

  private Test() {
    size = THIS_YEAR - 1930;
  }

  public int getSize() {
    return size;
  }

  public static void main(String[] args) {
    System.out.println(INSTANCE.getSize());
  }
}