Java第五章作业

1

import java.util.Scanner;
abstract class Animal{
    abstract void cry();
	abstract void getAnimalName();
	}
class Dog extends Animal{
	void getAnimalName(){
		System.out.print("现在播放狗类的声音:");
	}
	void cry(){
		System.out.println("汪汪...汪汪");
	}
}
class Cat extends Animal{
	void getAnimalName(){
		System.out.print("现在播放猫类的声音:");
	}
	void cry(){
		System.out.println("喵喵...喵喵");
	}
}
class Simulator{
	void playSound(Animal animal){
		animal.getAnimalName();
		animal.cry();
	}
}
public class Main{
public static void main(String args[]) {
	Simulator simulator = new Simulator();
	Scanner scan=new Scanner(System.in);
	String a=scan.next();
	if(a.equals("dog"))
	simulator.playSound(new Dog());
	if(a.equals("cat"))
	simulator.playSound(new Cat());
	}
}

2

import java.util.Scanner;
abstract class Car{
    abstract void getInfor();
}
class BMW extends Car{
     void getInfor(){
	    System.out.println("This is BMW");
	}
}
class Das extends Car{
	 void getInfor(){
	    System.out.println("This is Das");
	}
}
class Maze extends Car{
     void  getInfor(){
		System.out.println("This is Maze");
	}
}
class AA{
	void getCar(Car car){
		car.getInfor();
	}
}
public class Main {
    public static void main(String[] args) {
	Scanner up=new Scanner(System.in);
    AA aa=new AA();
	String a=up.next();
    if(a.equalsIgnoreCase("B")){
        aa.getCar(new BMW());
    }
    if(a.equalsIgnoreCase("D")){
        aa.getCar(new Das());
    }
    if(a.equalsIgnoreCase("M")){
        aa.getCar(new Maze());
    }
    }
}

3

import java.util.Scanner;
abstract class Person {
    String name;
    public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public abstract void showName();
}
class Student extends Person{
	
	public void setName(String name){
     this.name=name;   
	}
	public void showName(){
		System.out.println("I name is:"+name);
	}	
}

public class Main {
	public static void main(String[] args) {
		String name;
		Scanner scanner = new Scanner(System.in);
	    name = scanner.next();
		Student s = new Student();
		s.setName(name);
		s.showName();
	}
}

4

import java.util.Scanner;
interface Muitiplication{
      public double mult(double a,double b); 
      }
class MuitiplicationImpl implements  Muitiplication{
		public double mult(double a,double b){
			return a*b;
	}
}
class MuitiplicationImpls implements Muitiplication{
		public double mult(double a,double b){
			return a+b;
	}
}
public class Main {
    public static void main(String[] args) {
    	Scanner sca = new Scanner(System.in);
    	double i = sca.nextDouble();
    	MuitiplicationImpl m = new MuitiplicationImpl();
    	System.out.println(m.mult(i,i));
    	MuitiplicationImpls ms = new MuitiplicationImpls();
    	System.out.println(ms.mult(i,i));
	}
}