java入門第二季--繼承--java中的繼承初始化順序

摘要： java中的繼承初始化順序 父類和子類 /javaDemo3/src/com/imooc/Animal.java package com.imooc; public class Animal { public int age; publ...

java中的繼承初始化順序

父類和子類

/javaDemo3/src/com/imooc/Animal.java

package com.imooc;

public class Animal {
public int age;
public String name;
public void eat() {
System.out.println("年齡:"+age+ "動物可以吃東西" );
}
public Animal() {
System.out.println("Animal類執行了" );
}
}

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

package com.imooc;

public class Dog extends Animal {
public void eat() {
System.out.println("年齡:"+age+ "狗可以吃東西" );
}
public Dog() {
System.out.println("Dog類執行了" );
}
}

/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();
}

}

物件的屬性和構造方法

/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("年齡:"+age+ "動物可以吃東西" );
}
public Animal() {
age = 20;
System.out.println("Animal類執行了" );
}
}

/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();
}

}