接口与实现：实验2

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接口：

package mypackage;public interface ComputeWeight {public abstract double computeweight();}

接口实现：

package mypackage;public class Computer implements ComputeWeight {@Overridepublic double computeweight() {// TODO 自动生成的方法存根return 3.0;}}

package mypackage;public class Television implements ComputeWeight {@Overridepublic double computeweight() {// TODO 自动生成的方法存根return 3.5;}}

package mypackage;public class WashMachine implements ComputeWeight {@Overridepublic double computeweight() {// TODO 自动生成的方法存根return 10.5;}}

类：

package mypackage;public class Truck {ComputeWeight []goods;public Truck(ComputeWeight []goods){this.goods=goods;}public void setGoods(ComputeWeight []goods ){this.goods=goods;}public double getTotalWeight() {double totalWeights=0;for(int i=0; i<goods.length; i++) {totalWeights += goods[i].computeweight();}return totalWeights;}}

主类：

package Main;import mypackage.*;public class CheckCarWeight {public static void main(String[] args) {// TODO 自动生成的方法存根ComputeWeight [] goods =new ComputeWeight[650];for(int i=0; i<goods.length; i++) {if(i%3==0) goods[i]=new Television();else if(i%3==1) goods[i]=new Computer();else goods[i]=new WashMachine();}Truck truck=new Truck(goods);System.out.println("货物重量："+                   truck.getTotalWeight());goods=new ComputeWeight[68];for(int i=0; i<goods.length; i++) {if(i%2==0) goods[i]=new Television();else goods[i]= new WashMachine();}truck.setGoods(goods);System.out.println("货物重量："+                   truck.getTotalWeight());}}

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