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public class TV {
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private int channel;
private int volumn;
public TV() {
channel = 0;
volumn = 10;
}
public TV(int channel, int volumn) {
this.channel = channel;
this.volumn = volumn;
}
public void setChannel(int channel) {
this.channel = channel;
}
public void setVolumn(int volumn) {
this.volumn = volumn;
}
public void ChannelPlus() {
this.channel++;
}
public void VolumnPlus() {
this.volumn++;
}
}
（1）和（2）是构造器，不是方法，题目的表达不对……
哥们儿，这题不难一看就没好好学习，努力学习吧，只能帮你到这里了……
下面是UnitPrice接口代码：
public interface UnitPrice {
public double unitprice();
}
下面是电视机类代码：
public class Television implements UnitPrice {
@Override
public double unitprice() {
return 3500d;
}
}
下面是计算机类代码：
public class Computer implements UnitPrice {
@Override
public double unitprice() {
return 7800d;
}
}
下面是手机类代码：
public class Mobile implements UnitPrice {
@Override
public double unitprice() {
return 2500d;
}
}
下面是公共类代码：
import java.util.Scanner;
public class Common {
static double get(UnitPrice u) {
return u.unitprice();
}
@SuppressWarnings("resource")
public static void main(String[] args) {
System.out.print("请输入电视机的销售个数：");
Scanner scanner = new Scanner(System.in);
int television_num = scanner.nextInt();
System.out.print("请输入计算机的销售个数：");
scanner = new Scanner(System.in);
int computer_num = scanner.nextInt();
System.out.print("请输入手机的销售个数：");
scanner = new Scanner(System.in);
int mobile_num = scanner.nextInt();
double television_price = television_num * (get(new Television()));
System.out.println("电视机的销额是：" + television_price);
double computer_price = computer_num * (get(new Computer()));
System.out.println("计算机的销额是：" + computer_price);
double mobile_price = mobile_num * (get(new Mobile()));
System.out.println("手机的销额是：" + mobile_price);
System.out.println("总销额是：" + (television_price + computer_price + mobile_price));
scanner.close();
}
}
下面是执行后的效果截图：
麻烦您看一下，是否能够满足要求。
//TV类
public class Tv {
public void open(){
System.out.println("打开电视机");
}
public void close(){
System.out.println("关闭电视机");
}
public void search(int x){
System.out.println("您搜索到的是"+x+"号频道");
}
public void ctrlVol(String s){
int vol=10;
if(s.equals("+"))
vol++;
if(s.equals("-"))
vol--;
System.out.println("当前音量为"+vol);
}
public void changeChannel(int x){
if( x 29 )
System.out.println("没有该频道");
else
System.out.println("当前"+x+"号频道");
}
public void changeChannel(String s){
int x=0;
if(s.equals("+"))
x++;
if(s.equals("-"))
x--;
System.out.println("当前"+x+"号频道");
}
}
//Controller遥控器类
public class Controller{
public void openTv(Tv tv){
tv.open();
}
public void closeTv(Tv tv){
tv.close();
}
public void searchTv(Tv tv){
int x=(int)(Math.random()*30);
tv.search(x);
}
public void ctrlTvVol(Tv tv){
tv.ctrlVol("+");
}
public void changeTvChannel(Tv tv){
tv.changeChannel("+");
tv.changeChannel(23);
}
}
public class TV {
public static void main(String[] args) {
TV tv = new TV("海信", 5000, 56);
tv.turnOn();
tv.turnOff();
}
private String brand;
private double price;
private int size;
public TV() {
}
public TV(String brand, double price, int size) {
this.brand = brand;
this.price = price;
this.size = size;
}
public void turnOn() {
System.out.println("欢迎使用" + this.getBrand() + "电视机...");
}
public void turnOff() {
System.out.println("再见");
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
}