/**

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*?超市管理系統
*?@author?Administrator
*
*/
public?class?ChaoShiSystemManager?{
public?static?void?main(String[]?args)?{
new?HuoWuDomImpl().start();
}
}
class?HuoWu{
public?String?bianhao;?//商品編號
public?String?name;?//商品名稱
public?double?jiage;?//商品價格
}
class?HuoWuDomImpl{
private?static?java.util.ArrayListHuoWu?list?=?new?java.util.ArrayListHuoWu();
public?void?start(){
?int?num?=?0;
System.out.println("--歡迎登錄超市管理系統--");
System.out.println("1、添加商品");
System.out.println("2、查詢商品");
java.util.Scanner?sc?=?new?java.util.Scanner(System.in);
System.out.println("請輸入模塊名稱:");
try?{
num?=?sc.nextInt();
if(num?==?1){
setHuoWu();
new?HuoWuDomImpl().start();
}else?if(num?==?2){
getSeleteHuoWu();
new?HuoWuDomImpl().start();
}else{
throw?new?RuntimeException("提示:抱歉,模塊正在開發中");
}
}?catch?(Exception?e)?{
e.printStackTrace();
throw?new?RuntimeException("提示:對不起,您的輸入有誤!");
}finally{
sc.close();
}
}
public?void?setHuoWu(){
HuoWu?hw?=?new?HuoWu();
java.util.Scanner?sc?=?new?java.util.Scanner(System.in);
System.out.println("請輸入商品編號:");
hw.bianhao?=?sc.next();
System.out.println("請輸入商品名稱:");
hw.name?=?sc.next();
System.out.println("請輸入商品價格");
try?{
hw.jiage?=?sc.nextDouble();
}?catch?(Exception?e)?{
throw?new?RuntimeException("提示:商品價格輸入錯誤!");
}finally{
sc.close();
}
list.add(hw);
System.out.println("提示:恭喜,添加成功!");
}
public?void?getSeleteHuoWu(){
java.util.Scanner?sc?=?new?java.util.Scanner(System.in);
System.out.println("請輸入商品編號...");
String?bianhao?=?sc.next();
java.util.Iterator?it?=?list.iterator();
while(it.hasNext()){
if(bianhao.equals(((HuoWu)it.next()).bianhao)){
System.out.println("商品編號:"?+?((HuoWu)it.next()).bianhao);
System.out.println("商品名稱:"?+?((HuoWu)it.next()).name);
System.out.println("商品價格:"?+?((HuoWu)it.next()).jiage);
}
}
}
}
PS:程序可能還有點問題,自己調試一下吧。改天有空我再來更新。
package?entity;
public?class?Market?{
private?int?id;//id
private?int?num;//數量
private?String?goods;//商品
private?double?price;//價格
public?Market(int?id,?int?num,?String?goods,?double?price)?{
super();
this.id?=?id;
this.num?=?num;
this.goods?=?goods;
this.price?=?price;
}
public?int?getId()?{
return?id;
}
public?void?setId(int?id)?{
this.id?=?id;
}
public?int?getNum()?{
return?num;
}
public?void?setNum(int?num)?{
this.num?=?num;
}
public?String?getGoods()?{
return?goods;
}
public?void?setGoods(String?goods)?{
this.goods?=?goods;
}
public?double?getPrice()?{
return?price;
}
public?void?setPrice(double?price)?{
this.price?=?price;
}
public?double?calc(?){
double?sum=price*num;
System.out.println("您消費共計:"+sum+"¥");
return?sum;
}
}
package?test;
import?java.util.HashMap;
import?java.util.Map;
import?java.util.Scanner;
import?entity.Market;
public?class?Test?{
private?static?MapInteger,Market?goods=new?HashMapInteger,?Market();
public?static?void?main(String[]?args)?{
System.out.println("-------超市計價系統-------");
String?goods1="可口可樂";
String?goods2="爆米花";
String?goods3="益達";
printTable("編號","商品","價格");
printTable("1",goods1,"3.0¥");
printTable("2",goods2,"5.0¥");
printTable("3",goods3,"10.0¥");
goods.put(1,?new?Market(1,?1,?goods1,?3.0));
goods.put(2,?new?Market(2,?1,??goods2,?5.0));
goods.put(3,?new?Market(3,?1,?goods3,?10.0));
Scanner?input?=?new?Scanner(System.in);
System.out.println("請輸入商品的編號:");
int?num?=?input.nextInt();
System.out.println("請輸入商品的數量");
int?amount?=?input.nextInt();
Market?market?=?goods.get(num);
market.setNum(amount);
market.calc();
}
private?static?void?printTable(String?row1,String?row2,String?row3?)?{
System.out.print(row1);
int?times=12;
if?(row2!="商品")?{
times=5;
}
for?(int?i?=?0;?i??times;?i++)?{
System.out.print("?");
}
System.out.print(row2);
for?(int?i?=?0;?i??10;?i++)?{
System.out.print("?");
}
System.out.print(row3);
System.out.println("\n");
}
}
//測試結果:
-------超市計價系統-------
編號????????????商品??????????價格
1?????可口可樂??????????3.0¥
2?????爆米花??????????5.0¥
3?????益達??????????10.0¥
請輸入商品的編號:
3
請輸入商品的數量
5
您消費共計:50.0¥
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Conn {
private static final String driver="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://localhost:3306/blog?user=rootpassword=root";
//獲得數據庫連接
public static Connection getConnection(){
Connection conn = null;
try {
Class.forName(driver);
conn = DriverManager.getConnection(url);
if(conn != null){
System.out.print("成功");
}
} catch (SQLException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return conn;
}
//關閉Resultset
public static void closeResultSet(ResultSet rs)
{
try
{
if(rs != null)
{
rs.close();
}
}catch (SQLException ex)
{
ex.printStackTrace();
}
}
//關閉Statement
public static void closeStatement(Statement st)
{
try
{
if(st != null)
{
st.close();
}
}catch (SQLException ex)
{
ex.printStackTrace();
}
}
//關閉Connection
public static void closeConnection(Connection conn)
{
try
{
if(conn != null)
{
conn.close();
}
}catch (SQLException ex)
{
ex.printStackTrace();
}
}
//測試數據庫連接是否成功
public static void main(String[] args) {
Conn.getConnection();
}
}
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