java系統(tǒng)代碼 java系統(tǒng)代碼運(yùn)行找不到指定文件
java超市計(jì)價(jià)系統(tǒng)代碼
package?entity;
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public?class?Market?{
private?int?id;//id
private?int?num;//數(shù)量
private?String?goods;//商品
private?double?price;//價(jià)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(fèi)共計(jì)："+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(jì)價(jià)系統(tǒng)-------");
String?goods1="可口可樂(lè)";
String?goods2="爆米花";
String?goods3="益達(dá)";
printTable("編號(hào)","商品","價(jià)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(qǐng)輸入商品的編號(hào):");
int?num?=?input.nextInt();
System.out.println("請(qǐng)輸入商品的數(shù)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(cè)試結(jié)果：
-------超市計(jì)價(jià)系統(tǒng)-------
編號(hào)????????????商品??????????價(jià)格
1?????可口可樂(lè)??????????3.0￥
2?????爆米花??????????5.0￥
3?????益達(dá)??????????10.0￥
請(qǐng)輸入商品的編號(hào):
3
請(qǐng)輸入商品的數(shù)量
5
您消費(fèi)共計(jì)：50.0￥
java 商品 系統(tǒng) 代碼
package entity;
public class Market {
private int id;//id
private int num;//數(shù)量
private String goods;//商品
private double price;//價(jià)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(fèi)共計(jì)："+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(jì)價(jià)系統(tǒng)-------");
String goods1="可口可樂(lè)";
String goods2="爆米花";
String goods3="益達(dá)";
printTable("編號(hào)","商品","價(jià)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(qǐng)輸入商品的編號(hào):");
int num = input.nextInt();
System.out.println("請(qǐng)輸入商品的數(shù)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(cè)試結(jié)果：
-------超市計(jì)價(jià)系統(tǒng)-------
編號(hào) 商品 價(jià)格
1 可口可樂(lè) 3.0￥
2 爆米花 5.0￥
3 益達(dá) 10.0￥
請(qǐng)輸入商品的編號(hào):
3
請(qǐng)輸入商品的數(shù)量
5
您消費(fèi)共計(jì)：50.0￥
java通訊錄管理系統(tǒng)設(shè)計(jì)代碼怎么編譯
java編寫(xiě)這個(gè)通訊錄管理系統(tǒng)
java編寫(xiě)這個(gè)通訊錄管理系統(tǒng)_Java如何實(shí)現(xiàn)通訊錄管理系統(tǒng)
咕嚕嚕在芬蘭
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Java如何實(shí)現(xiàn)通訊錄管理系統(tǒng)
發(fā)布時(shí)間：2020-07-28 09:39:42
來(lái)源：億速云
閱讀：65
作者：Leah
這篇文章將為大家詳細(xì)講解有關(guān)Java如何實(shí)現(xiàn)通訊錄管理系統(tǒng)，文章內(nèi)容質(zhì)量較高，因此小編分享給大家做個(gè)參考，希望大家閱讀完這篇文章后對(duì)相關(guān)知識(shí)有一定的了解。
本文實(shí)例為大家分享了java實(shí)現(xiàn)通訊錄管理系統(tǒng)的具體代碼，供大家參考，具體內(nèi)容如下
完成項(xiàng)目的流程：
1.根據(jù)需求，確定大體方向
2.功能模塊分析
3.界面實(shí)現(xiàn)
4.功能模塊設(shè)計(jì)
5.coding
6.代碼測(cè)試
下面是源代碼：import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.concurrent.SynchronousQueue;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
import javax.swing.text.html.HTMLDocument.Iterator;
class Infro{
public String id;
public String name;
public String sex;
public String address;
public String e_mail;
public String phoneNumber;
static int index = 0;
static ArrayList list = new ArrayList();
static int len = list.size();
//構(gòu)造函數(shù)
public Infro(String id,String name,String sex,String address,String e_mail,String phoneNumber){
this.id = id;
this.name = name;
this.sex = sex;
this.address = address;
this.e_mail = e_mail;
this.phoneNumber = phoneNumber;
}
public String toString(){
return "編號(hào)："+id+" 姓名："+name+" 性別："+sex+" 通訊地址："+address+" 郵箱地址："+e_mail+" 電話："+phoneNumber;
}
/**
* 添加功能
**/
public static void addFunction(){//添加功能
Infro infro = new Infro("","","","","","");
System.out.println("請(qǐng)輸入添加的數(shù)據(jù)：");
Scanner in = new Scanner(System.in);
System.out.println("輸入編號(hào)：");
infro.id = in.next();
System.out.println("輸入姓名：");
infro.name = in.next();
System.out.println("輸入性別：");
infro.sex = in.next();
System.out.println("輸入通訊地址：");
infro.address = in.next();
System.
out.println("輸入郵箱地址：");
infro.e_mail = in.next();
System.out.println("輸入電話：");
infro.phoneNumber = in.next();
list.add(index,infro);
index++;
if(list.isEmpty()){
System.out.println("數(shù)據(jù)添加失敗啦");
}else{
System.out.println("數(shù)據(jù)添加成功啦");
len++;//list集合長(zhǎng)度加一
// System.out.println(list.get(0).toString());
}
}
// public static void deleteFunction(){//刪除功能
// System.out.println("輸入要?jiǎng)h除的聯(lián)系人的編號(hào)");
// Scanner in_2 = new Scanner(System.in);
// String d1 = in_2.nextLine();
// for(int a= 0; a
// if(d1.equals(list.get(a).id)){
// list.remove(list.get(a));
// len --;
// }
// }
// }
/**
* 刪除功能
**/
public static void deleteFunction(){
System.out.println("輸入要?jiǎng)h除的聯(lián)系人的編號(hào)");
Scanner in_2 = new Scanner(System.in);
String d1 = in_2.nextLine();
java.util.Iterator it = list.iterator();
while (it.hasNext()){
Infro infro = it.next();
if (infro.id.equals(d1)){
it.remove();
--index;//一定要加這個(gè)，否則當(dāng)做了刪除操作再做添加操作的時(shí)候會(huì)出現(xiàn)異常(類(lèi)似于指針，棧)
System.out.println("刪除完畢"+"此時(shí)通訊錄記錄條數(shù)為：" + --len);
}
}
}
/**
* 修改功能
**/
public static void reditFunction(){
System.out.println("輸入要修改的通訊錄的Id");
Scanner in_r = new Scanner(System.in);
String r1 = in_r.nextLine();
for(int a = 0; a len;a++){
if(r1.equals(list.get(a).id)){
System.out.println("輸入修改后的姓名：");
String name_1 = in_r.next();
list.get(a).name = name_1;
System.out.println("輸入修改后的性別：");
String sex_1 = in_r.next();
list.get(a).sex = sex_1;
System.out.println("輸入修改后的通訊地址：");
String address_1 = in_r.next();
list.get(a).address = address_1;
System.out.println("輸入修改后的郵箱地址：");
String e_mail_1 = in_r.next();
list.get(a).e_mail = e_mail_1;
System.out.println("輸入修改后的電話：");
String phoneNumber_1 = in_r.next();
list.get(a).phoneNumber = phoneNumber_1;
System.out.println("數(shù)據(jù)修改完畢");
}
}
}
/**
* 查詢(xún)功能
**/
public static void searchFunction() throws Exception{//查詢(xún)功能
System.out.println("請(qǐng)輸入要查詢(xún)的姓名：");
Scanner in_1 = new Scanner(System.in);
String s1=in_1.nextLine();
for(int a= 0; a
if(s1.equals(list.get(a).name)){
System.out.println(list.get(a).toString());
}
}
}
/**
* 顯示功能
**/
public static void showFunction(){
for(int i = 0 ;i
System.out.println(list.get(i).toString());
}
}
/**
* 保存功能
**/
public static void writeFunction() throws IOException{
FileWriter writer = new FileWriter("通訊錄管理.txt");
for(int i = 0 ;i
String []strwriter = new String[len];
strwriter[i]=list.get(i).toString();
writer.write(strwriter[i]);
writer.write("\r\n");
System.out.println("成功寫(xiě)入一行數(shù)據(jù)到 通訊錄管理.txt 中");
}
writer.close();//關(guān)閉寫(xiě)入流，釋放資源
}
/**
* 讀取功能
**/
public static void readFunction() throws IOException{
FileReader reader = new FileReader("通訊錄管理.txt");
BufferedReader br = new BufferedReader(reader);
String str;
while((str = br.readLine()) != null){//每次讀取一行文本，判斷是否到達(dá)文件尾
System.out.println(str);
}
br.close();
}
}
public class Demo extends JFrame {
/**
* 界面設(shè)計(jì)
**/
public Demo(){
Container c = getContentPane(); //定義一個(gè)頂級(jí)容器c
JPanel jp = new JPanel(); //新建JPanel面板--jp
JButton button1 = new JButton("新建聯(lián)系人");
JButton button2 = new JButton("刪除聯(lián)系人");
JButton button3 = new JButton("編輯聯(lián)系人");
JButton button4 = new JButton("查找聯(lián)系人");
JButton button5 = new JButton("顯示所有聯(lián)系人");
JButton button6 = new JButton("保存聯(lián)系人到本地");
JButton button7 = new JButton("讀取本地聯(lián)系人");
jp.setLayout(new GridLayout(2,4,5,5));//新建網(wǎng)格布局管理器(行數(shù)，列數(shù)，組件間的水平垂直間距)
jp.add(button1);
jp.add(button2);
jp.add(button3);
jp.add(button4);
jp.add(button5);
jp.add(button6);
jp.add(button7);
c.add(jp);//將JPanel面板jp添加到頂級(jí)容器c中
setSize(600,500);
setTitle("*通 訊 錄 管 理 系 統(tǒng)*");
setVisible(true);
setResizable(false);//窗體大小由程序員決定，用戶(hù)不能自由改變大小
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
/**
*按鍵響應(yīng)
*
**/
button1.addActionListener(new ActionListener(){//添加功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
Infro.addFunction();
}
});
button2.addActionListener(new ActionListener(){//刪除功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
Infro.deleteFunction();
}
});
button3.addActionListener(new ActionListener(){//修改功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
Infro.reditFunction();
}
});
button4.addActionListener(new ActionListener(){//查詢(xún)功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
try {
Infro.searchFunction();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
button5.addActionListener(new ActionListener(){//顯示功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
Infro.showFunction();
}
});
button6.addActionListener(new ActionListener(){//保存功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
try {
Infro.writeFunction();
} catch (IOException e) {
e.printStackTrace();
}
}
});
button7.addActionListener(new ActionListener(){//讀取功能實(shí)現(xiàn)
public void actionPerformed(ActionEvent arg0){
try {
Infro.readFunction();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
public static void main(String[] args) {
// TODO Auto-generated method stub
new Demo();
Infro a = new Infro("", "", "", "", "", "");
}
}
關(guān)于Java如何實(shí)現(xiàn)通訊錄管理系統(tǒng)就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，可以學(xué)到更多知識(shí)。如果覺(jué)得文章不錯(cuò)，可以把它分享出去讓更多的人看到。
名稱(chēng)欄目：java系統(tǒng)代碼 java系統(tǒng)代碼運(yùn)行找不到指定文件
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