java入门第二季–继承–java中的继承初始化顺序

java 中的继承初始化顺序

父类和子类
/javaDemo3/src/com/imooc/Animal.java
package com.imooc;

public class Animal {
public int age;
public String name;
public void eat() {
System.out.println(“ 年龄:”+age+ “ 动物可以吃东西 ”);
}
public Animal() {
System.out.println(“Animal 类执行了 ”);
}
}

/javaDemo3/src/com/imooc/Dog.java
package com.imooc;

public class Dog extends Animal {
public void eat() {
System.out.println(“ 年龄:”+age+ “ 狗可以吃东西 ”);
}
public Dog() {
System.out.println(“Dog 类执行了 ”);
}
}

/javaDemo3/src/com/imooc/Initail.java
package com.imooc;

public class Initail {

public static void main(String[] args) {
// TODO Auto-generated method stub
Dog dog = new Dog();
dog.age = 10;
dog.name = “aa”;
dog.eat();
}

}

对象的属性和构造方法
/javaDemo3/src/com/imooc/Animal.java
package com.imooc;

public class Animal {
public int age = 10;
public String name;
public void eat() {
System.out.println(“ 年龄:”+age+ “ 动物可以吃东西 ”);
}
public Animal() {
age = 20;
System.out.println(“Animal 类执行了 ”);
}
}

/javaDemo3/src/com/imooc/Initail.java
package com.imooc;

public class Initail {

public static void main(String[] args) {
// TODO Auto-generated method stub
Animal animal = new Animal();
System.out.println(“animal 的 age:” + animal.age);
Dog dog = new Dog();
dog.age = 10;
dog.name = “aa”;
dog.eat();
}

}