构造器重载
敲完程序后 运行的结果不正确 不晓得是哪里出现了问题
请各位朋友帮忙
public static void main(String[] args){
Animal a1 = new Animal();
System.out.println("--------");
Animal a2 = new Animal(18);
System.out.println("--------");
Animal a3 = new Animal("Tony");
System.out.println("--------");
Animal a4 = new Animal("Jerry",22);
System.out.println("--------");
}