构造器二

package oop;

public class Pet {
public String name;
public int age;
//无参构造
public void shout() {
System.out.println("叫一声");
}
}

package oop;
public class PetApplication {

public static void main(String[] args) {
	// TODO Auto-generated method stub
	Pet dog=new Pet();
	dog.name="wangwang";
	dog.age=3;
	dog.shout();
	System.out.println(dog.name);
	System.out.println(dog.age);
	Pet cat=new Pet();
}

}
输出结果:
叫一声
wangwang
3