急Java编程题

急Java编程题

//新建Test.java文件

import java.util.ArrayList;

class Vegetable
{
private String name;
private double weight;

public Vegetable(String name,double weight)
{
this.name = name;
this.weight = weight;
}

public String getName()
{
return this.name;
}

public double getWeight()
{
return this.weight;
}
}

class Box
{
ArrayList arr = new ArrayList();
public void putVegetable(Vegetable v)
{
arr.add(v);
System.out.println(v.getName() + ", weight:" + v.getWeight());
}
}

public class Test {
public static void main(String []args)
{
Vegetable onin = new Vegetable("Onin",3.5);
Vegetable tomato = new Vegetable("Tomato",4.2);
Box b = new Box();
b.putVegetable(onin);
b.putVegetable(tomato);
}
}

class interface box(){
public String showName();
public double showWeight();
}
class onion implements box(){
public String showName(){
retrun "洋葱";
}
public double showWeight(){
return "3kg";
}
}
class tomato implements box(){

public String showName(){
retrun "西红柿";
}
public double showWeight(){
return "4kg";
}
}
class test{
public void shows (box b){
System.out.println( b.showName());
System.out.println(b.showWeight());
}
public static void main(String[] args){
test t = new test();
t.shows(new union());
t.shows(new tomato());
}
}追问还要创建几个实现类吗？追答这样符合java编程思想。

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