11.13第12次作业

1 this关键字

package com.Hani;

class E{
    private F b=null;
    public void fun(){
        this.b=new F (this);
        this.b.fun();
    }
    public void print(){
        System.out.println("Hello World!!!");
    }
};
class F{
    private E a=null;
    public F(E a){
        this.a=a;
        }
    public void fun(){
        this.a.print();
    }
};

public class DemoThis {
    public static void main(String args[]){
        new E().fun();
    }

}
 

2 父类

package com.Hani;

abstract class A{
    public abstract void fun();
}
class B extends A{
    public void fun(){
        System.out.println("Hello World!");
    }
}
public class DemoAbstract{
    public static void main(String args[]){
        B b=new B();
        b.fun();
    }
    
}

 

3.

package com.Hani;
abstract class C{
    private String name;
    public C(String name){
        this.name=name;
    }
    public String getName(){
        return this.name;
    }
    public abstract void fun();
};

class D extends C {
    public D(String name){
        super(name);
    }
    public void fun() {    
        System.out.println(super.getName());
    }    
};
public class DemoAbstrsct1 {
    public static void main(String args[]){
        D d=new D("爱豆鹿晗");
        d.fun();
    }

}

 

4.工人学生

public abstract class Person {
    private String name;
    private int age;
    public Person(String name,int age){
        this.name=name;
        this.age=age;
        
    }
    public Person() {
        super();
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public abstract String speak();
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

public class Student extends Person {
    private float score;
    public Student(){
        
    }
    public Student(String name,int age,float score) {
        // TODO 自动生成的构造函数存根
        super(name,age);
        this.score=score;
        //this.setScore(score);
    }
    @Override
    public String speak() {
        // TODO 自动生成的方法存根
        return "我是"+super.getName()+", 我"+super.getAge()+"岁了,"+"我的成绩是"+this.score;
    }
    public float getScore() {
        return score;
    }
    public void setScore(float score) {
        this.score = score;
    }
    

}

public class Worker extends Person {
    private float rewards;
    public Worker(String name, int age, float rewards) {
        // TODO 自动生成的构造函数存根
        super(name, age);
        this.rewards=rewards;
    }
    
    @Override
    public String speak() {
        // TODO 自动生成的方法存根
        return "我是"+super.getName()+", 我"+super.getAge()+"岁了,"+"我的工资是"+this.rewards;
    }
    public float getRewards() {
        return rewards;
    }
    public void setRewards(float rewards) {
        this.rewards = rewards;
    }
    
    

}

package cn.wzx.www;

public class DemoWoSt {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        Person student =new Student("张三",18,59.0f);
        Person worker =new Worker("李四",30,3600.8f);
        print(student.speak());
        print(worker.speak());

    }
     private static void print(String speak) {
            System.out.println(speak);
        }


}

5.抽象类

package cn.dede.w;
abstract class A3
{
public abstract void fun();
}
class B3 extends A3
{
public void fun()
{
System.out.println("yeah");
}
}
public class AbstractDemo3
{
public static void main(String args[])
{
A3 a=new B3();
a.fun();
}
}