JAVA-继承

package oop.继承;
import oop.Student;
public class Application {
    public static void main(String[] args) {
        student student = new student();
        student.test("陈丹宇");
    }
}
package oop.继承;
//JAVA中,所有的类，都默认直接或者间接继承object
//person 人 ： 父类
public class person {
    public String name = "chendanyu";
    public void print(){
        System.out.println("Person");
    }
}
package oop.继承;
//学生 is 人： 派生类，子类
//子类继承了父类，就会拥有父类的全部方法
public class student extends person{
    public String name = "qq";
    public void print(){
        System.out.println("Student");
    }
    public void test(String name){
        System.out.println(name);//陈丹宇
        System.out.println(this.name);//qq
        System.out.println(super.name);//chendanyu
    }
}

package oop.继承;
import oop.Student;
public class Application {
    public static void main(String[] args) {
        student student = new student();
        student.test("陈丹宇");
        student.test1();
    }
}
package oop.继承;
//学生 is 人： 派生类，子类
//子类继承了父类，就会拥有父类的全部方法
public class student extends person{
    public String name = "qq";
    public void print(){
        System.out.println("Student");
    }
    public void test(String name){
        System.out.println(name);
        System.out.println(this.name);
        System.out.println(super.name);
    }
    public void test1(){
        print();//student
        this.print();//student
        super.print();//person
    }
}
package oop.继承;
//JAVA中,所有的类，都默认直接或者间接继承object
//person 人 ： 父类
public class person {
    public void say(){
        System.out.println("学生说了一句话");
    }
    public String name = "chendanyu";
    public void print(){
        System.out.println("Person");
    }
}

package oop.方法重写;
import oop.方法重写.A;
import oop.方法重写.B;
public class Application {
    public static void main(String[] args) {
        A a = new A();
        a.test();
        //父类的应用指向了子类
        B b = new A();//子类重写了父类的方法
        b.test();
    }
}
package oop.方法重写;
public class A extends B{
    //子类继承父类方法重写的快捷键
    //Ctrl + Ins
    //Override 重写的意思
    @Override//注解：有功能的注释
    public void test() {
        super.test();
    }
    /*
    public  void test(){
        System.out.println("A-->test");
    }
     */
}
package oop.方法重写;
public class B {
    public   void test(){
        System.out.println("B-->test");
    }
}