package day31;
​
public class Pet {
    String name;
    int age;
    public void shout(){
        System.out.println("叫了一声");
    }
}
​

package day31;
​
public class Application {
    public static void main(String[] args) {
        Pet cat = new Pet();
        cat.name="肥波";
        cat.age=2;
        cat.shout();
        System.out.println(cat.name);
        System.out.println(cat.age);
    }
}
​

Java中会把方法区的变量加载到堆里面的对象上