2月14日 Core Java 周三

继承

Animal

/* hao

* 2018-2-14 11:39:22

* 继承

*/

public class Animal {

int age;

String name;

void eat(){
System.out.println("吃");
}

}

/* hao

* 2018-2-14 11:41:52

* Animal子类

*/

public class Dog extends Animal {

}

public class Initail {

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

}

User

/* hao

* 2018-2-13 16:42:24

* User类

*/

public class User extends Object{

String name;

int code;

String type;

//创建无参方法

User(){

System.out.println(“父对象出生了”);

}

User(String name,int code,String type){
this.name=name;
this.code=code;
this.type=type;
}

void speak(){
System.out.println("爱说");
}
void eat(){
System.out.println("爱吃");
}

void show(){
System.out.println("展示自己信息");
}

}

/* hao

* 2018-2-14 21:32:35

* 子类

*/

public class Worker extends User {

// Worker(){

// super();

// System.out.println(“子对象出生了”);

// }

Worker(String name, int code, String type) {

// super(); // 显式调用

super(name, code, type); // 显式调用

}

public static void main(String [] args){
Worker w = new Worker("aaa", 111, "222");
w.speak();
w.eat();
}

void speak(){
System.out.println("能说");
}
void eat(){
System.out.println("能吃");
}
void print(){
System.out.println("Worker [name=" + name + ", code=" + code + ", type=" + type + "]");
}

}

/* hao

* 2018-2-14 21:27:57

* 测试

*/

public class TestUser {

public static void main(String[] args) {
// TODO Auto-generated method stub
Worker wo = new Worker("www",111,"ooo");
Worker rk = new Worker("rrr",222,"kkk");
wo.print();
rk.print();
}

}

我宁愿失去一个印度，也不愿失去一个莎士比亚。

——丘吉尔《大国崛起大道思行》