这段代码为什么a1/a2不显示我的赋值呢？

package xinGang;

public class Day_01_02{
    public static void main(String[] args) {
  double heightAvg1=176.8;
  int heightAvg2=(int)heightAvg1;
  double a1=55.9;
  int a2=(int)a1;
  System.out.println(heightAvg1);
  System.out.println(heightAvg2);
  System.out.println("a1");
  System.out.println("a2");
 }
}