这个程序哪儿错了呀?怎么运行不了
public class HelloWorld{ public static void main(String[] args) { int age1=24; int age2=18; int age3=36; int age4=27; int sum=age1+age2+age3+age4; double avge=sum/4; int minus=age1-age2; int newAge=--age1; System.out.println("年龄总和:"+sum); System.out.println("平均年龄:"+avg); System.out.println("年龄差值:"+minus); System.out.println("自减后的年龄:"+newAge); } }