Java 抽象类做函数参数和返回值、接口做函数参数和返回值

目录

一、抽象类做函数参数

 二、抽象类做函数返回值

 三、接口做函数参数

四、接口做函数返回值

---

一、抽象类做函数参数

package day14;

public abstract class Fu {
	public abstract void show();
}

package day14;


public class Zi extends Fu{
	@Override
	public void show() {
		// TODO Auto-generated method stub
		System.out.println("我吃大大泡泡糖");
	}
}

package day14;
//抽象类做为函数参数
public class Test {
	public static void main(String[] args) {
		Fu f = new Zi();
		method(f);
	}
	public  static void method(Fu f){
		f.show();
	}
}

运行结果：

 二、抽象类做函数返回值

package day1;

public abstract class Fu {
	public abstract void show();
}	

package day1;

public class Zi extends Fu{
	public void show(){
		System.out.println("抽个芙蓉王、、、试试 劲！");
	}
}

package day1;
//抽象类做函数返回值
public class Test {
	public static void main(String[] args) {
		
		Fu  f  = method();
		f.show();
	}
	public static Fu method(){
		Fu  f  =new  Zi();
		return f;
	}
}

运行结果：

 三、接口做函数参数

package day2;

public interface Fu {
	public abstract void show();
}

package day2;

public class Zi implements Fu{
	@Override
	public void show() {
		// TODO Auto-generated method stub
		System.out.println("老王刚带进来两个小师妹");	
	}
}

package day2;
//接口做函数参数
public class Test {
	public static void main(String[] args) {
		Fu f  = new Zi();
		method(f);
	}
	public static void method(Fu f){
		f.show();
	}
}

运行结果：

四、接口做函数返回值

package demo3;

public interface Fu {
	public abstract void show();
}

package demo3;

public class Zi implements Fu{
	@Override
	public void show() {
		// TODO Auto-generated method stub
		System.out.println("还有一个小师弟");
	}
}

package demo3;
//接口做函数的返回值
public class Test {
	public static void main(String[] args) {
		Fu f2 = method();
		f2.show();
	}
	public static Fu method(){
		Fu  f = new  Zi();
		return f;
	}
}

运行结果：