Создать имена переменной с помощью цикла в Java?

Question

Создать имена переменной с помощью цикла в Java?

в первый раз плакат, давний читатель так быть нежным со мной :)

См. следующий код, который работает для генерации меня метки времени в течение начала и конца каждого месяца за финансовый год.

int year = 2010;
// Financial year runs from Sept-Aug so earlyMonths are those where year = FY-1 and lateMonths are those where year = FY
int[] earlyMonths = {8, 9, 10, 11}; // Sept to Dec
int earlyYear = year -1;
for (int i : earlyMonths) {
    month = i;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(earlyYear,month,1,0,0,0);
    Long start = cal.getTimeInMillis();
    cal.clear();
    cal.set(earlyYear,month,1);
    lastDayofMonth = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
    cal.set(earlyYear,month,lastDayofMonth,23,59,59);
    Long end = cal.getTimeInMillis();
}
int[] lateMonths = {0, 1, 2, 3, 4, 5, 6, 7}; // Jan to Aug
for (int i : lateMonths) {
    month = i;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(year,month,1,0,0,0);
    Long start = cal.getTimeInMillis();
    cal.clear();
    cal.set(year,month,1);
    lastDayofMonth = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
    cal.set(year,month,lastDayofMonth,23,59,59);
    Long end = cal.getTimeInMillis();
}

Пока неплохо, но для использования этих результатов, мне нужны эти метки времени, которые будут произведены к переменным, названным месяцем (чтобы использоваться в подготовленном операторе позже в коде. например, SeptStart = sometimestamp, SeptEnd = некоторая метка времени и т.д. и т.д.

Я не знаю, возможно ли объявить новые переменные на основе результатов каждого цикла. Какие-либо идеи?

6

java dynamic variables loops names

задан Jonik 19 April 2010 в 07:07

6 ответов

Вместо генерации имен переменных используйте карту , где ключ - это название месяца, а значение - это значение этого месяца.

Вместо Date septStart = некоторая дата вы можете сделать startDates.put ("сентябрь", некоторая дата)

Или еще лучше сохранить значения в массиве, где индекс это номер месяца: startDates [8] = некоторая дата // с индексом 0!

3

ответ дан 9 December 2019 в 20:41

Карта действительно кажется хорошим решением :) Я новичок в java / jsp (и в большинстве программ в целом!), Поэтому я не знал, насколько это просто:)

Следующий код:

// Financial year runs from Sept-Aug so earlyMonths are those where year = FY-1 and lateMonths are those where year = FY
HashMap hm = new HashMap();
int[] earlyMonths = {8, 9, 10, 11}; // Sept to Dec
int earlyYear = year -1;
for (int i : earlyMonths) {
    month = i;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(earlyYear,month,1,0,0,0);
    Long start = cal.getTimeInMillis();
    hm.put(month + "_start", new Long(start));
    cal.clear();
    cal.set(earlyYear,month,1);
    lastDayofMonth = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
    cal.set(earlyYear,month,lastDayofMonth,23,59,59);
    Long end = cal.getTimeInMillis();
    hm.put(month + "_end", new Long(end));
}
int[] lateMonths = {0, 1, 2, 3, 4, 5, 6, 7}; // Jan to Aug
for (int i : lateMonths) {
    month = i;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(year,month,1,0,0,0);
    Long start = cal.getTimeInMillis();
    hm.put(month + "_start", new Long(start));
    cal.clear();
    cal.set(year,month,1);
    lastDayofMonth = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
    cal.set(year,month,lastDayofMonth,23,59,59);
    Long end = cal.getTimeInMillis();
    hm.put(month + "_end", new Long(end));
}
Set set = hm.entrySet();
Iterator hmi = set.iterator();
while(hmi.hasNext()){
    Map.Entry me = (Map.Entry)hmi.next();
    out.println(me.getKey() + " : " + me.getValue() + "<br>");
}

Дает мне следующий вывод:

4_end : 1275350399000
3_start : 1270080000000
8_end : 1254355199000
10_start : 1257033600000
1_start : 1264982400000
2_start : 1267401600000
8_start : 1251763200000
10_end : 1259625599000
0_start : 1262304000000
7_start : 1280620800000
0_end : 1264982399000
4_start : 1272672000000
5_start : 1275350400000
11_end : 1262303999000
5_end : 1277942399000
6_start : 1277942400000
9_start : 1254355200000
3_end : 1272671999000
2_end : 1270079999000
9_end : 1257033599000
11_start : 1259625600000
1_end : 1267401599000
7_end : 1283299199000
6_end : 1280620799000

Мне было любопытно, почему это было заказано таким образом? Что касается функциональности, то это не важно, но для целей отладки можно заказать хэш-карту?

Спасибо за отличные предложения всем вокруг :)

0

ответ дан 9 December 2019 в 20:41

Вы не можете объявлять переменные динамически. Я предлагаю объявить два массива меток времени (один для начала и один для конца) и заполнить их. Затем либо используйте эти массивы вместо именованных переменных, либо объявите переменные вручную и установите их вручную.

Calendar[] beginnings = new Calendar[12];
Calendar[] endings = new Calendar[12];

for (int i: earlyMontsh) {
  // Calc beginning ...
  beginnings[i] = cal;
  cal = Calendar.getInstance(); // Important, create new instance!
  // Calc ending ...
  endings[i] = cal;
}
// ... Same for second loop ...

Calendar janStart = beginnings[0];
Calendar janEnd = endings[0];
Calendar febStart = beginnigs[1];
Calendar febEnd = endings[1];
// .. And so on ...
Calendar decStart = beginnings[11];
Calendar decEnd = endings[11];

1

ответ дан 9 December 2019 в 20:41

Для завершения я публикую полный код. Он извлекает информацию о доступности наших производственных серверов из базы данных для отчета управления. Это самая сложная вещь, которую я когда-либо делал в JSP:)

Я уверен, что многие вещи можно было бы сделать более элегантно, поэтому, пожалуйста, не стесняйтесь советовать :) (очевидно, пароли db и т. Д. Вычеркнуты в XXX)

<%@page language="java" contentType="text/html"%>
<%@page import="java.util.*,java.sql.*,java.text.*"%>
<html>
<head>
    <title>KPI: FY10</title>
    <link rel="stylesheet" type="text/css" href="reports.css">
</head>
<%
// Example SQL "select count(timestamp) from jagel_hq_log where timestamp > 1270080000000 and timestamp < 1272671999000 and kpi_id = 9"

/* ------------- START CONFIGURABLE VARIABLES -------------*/

int year = 2010;
boolean leapYear = false;
String db_user = "XXXX";
String db_pass = "XXXX";

// Special Case of Leap Years
int febMins;
if(leapYear=true) {
    febMins = 41760;
    }
    else {
    febMins = 44640;    
    }

int yearMins;
if(leapYear=true) {
    yearMins = 527040;
    }
    else {
    yearMins = 525600;
    }
int minsYear = yearMins;

// minutes in each month
int minsJan = 44640;
int minsFeb = febMins;
int minsMar = 44640;
float minsApr = 43200;
int minsMay = 44640;
int minsJun = 43200;
int minsJul = 44640;
int minsAug = 44640;
int minsSep = 43200;
int minsOct = 44640;
int minsNov = 43200;
int minsDec = 44640;

String maxAvail = "#CDEB8B";
String medAvail = "#FFFF88";
String minAvail = "#FDE8D7";
String colour;


/* ------------- END CONFIGURABLE VARIABLES -------------*/

/* Initialise Variables */
int month = 0;
int lastDayofMonth;
int totalMins = 0;
float mins_down = 0;
float avail = 0;
DecimalFormat round = new DecimalFormat("###.###");
Long startTime;
Long endTime;

// Connect to DB
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
String connString="jdbc:oracle:thin:@XXXXXXXX.XXXXX.com:XXXX:XXXXXX";
Connection conn = DriverManager.getConnection(connString,db_user,db_pass);

/* Get months of year as 'to' and 'from' timestamps */
// Financial year runs from Sept-Aug so earlyMonths are those where 'year = FY-1' and lateMonths are those where 'year = FY'
HashMap hm = new HashMap();
int[] earlyMonths = {8, 9, 10, 11}; // Sept to Dec
int earlyYear = year -1;
for (int i : earlyMonths) {
    month = i;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(earlyYear,month,1,0,0,0);
    Long start = cal.getTimeInMillis();
    hm.put(month + "_start", new Long(start));
    cal.clear();
    cal.set(earlyYear,month,1);
    lastDayofMonth = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
    cal.set(earlyYear,month,lastDayofMonth,23,59,59);
    Long end = cal.getTimeInMillis();
    hm.put(month + "_end", new Long(end));
}
int[] lateMonths = {0, 1, 2, 3, 4, 5, 6, 7}; // Jan to Aug
for (int i : lateMonths) {
    month = i;
    Calendar cal = Calendar.getInstance();
    cal.clear();
    cal.set(year,month,1,0,0,0);
    Long start = cal.getTimeInMillis();
    hm.put(month + "_start", new Long(start));
    cal.clear();
    cal.set(year,month,1);
    lastDayofMonth = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
    cal.set(year,month,lastDayofMonth,23,59,59);
    Long end = cal.getTimeInMillis();
    hm.put(month + "_end", new Long(end));
}
%>

<!-- Header -->
<a href="index.jsp"><-- Back to Index</a><br>
<div align="center">
<h2>IITP Availability Report</h2>
<%
Calendar c = Calendar.getInstance();
out.println("Report Generated: " + c.getTime() + " and accurate up to (and including) yesterday");
%>
</div>

<!-- Start Table -->
<table class="mar">
<tr>
    <th class="header">KPI Name</th>
    <th class="header">Description</th>
    <th class="header" colspan="2">Sep <% out.println( year - 1 ); %></th>  
    <th class="header" colspan="2">Oct <% out.println( year - 1 ); %></th>  
    <th class="header" colspan="2">Nov <% out.println( year - 1 ); %></th>
    <th class="header" colspan="2">Dec <% out.println( year - 1 ); %></th>
    <th class="header" colspan="2">Jan <% out.println( year ); %></th>
    <th class="header" colspan="2">Feb <% out.println( year ); %></th>
    <th class="header" colspan="2">Mar <% out.println( year ); %></th>
    <th class="header" colspan="2">Apr <% out.println( year ); %></th>
    <th class="header" colspan="2">May <% out.println( year ); %></th>
    <th class="header" colspan="2">Jun <% out.println( year ); %></th>
    <th class="header" colspan="2">Jul <% out.println( year ); %></th>
    <th class="header" colspan="2">Aug <% out.println( year ); %></th>
    <th class="header" colspan="2">Avg <% out.println( year ); %></th>
</tr>
<tr>
    <th class="top">&nbsp</th>
    <th class="top">&nbsp</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
    <th class="top">Mins Down</th>
    <th class="top">% Avail</th>
</tr>
<%
// Get all KPI_ID's
Statement stmt = conn.createStatement();
ResultSet rs_id = stmt.executeQuery("select distinct (KPI_ID) from JAGEL_KPI_SPECS order by KPI_ID");

// initialise Result Set
ResultSet rs_minsDown;

while (rs_id.next()){
    int id = rs_id.getInt("KPI_ID");

    // Get the kpi name and description from db
    PreparedStatement ps_names = conn.prepareStatement("select KPI_ID, KPI_GROUP_NAME, DESCRIPTION from JAGEL_KPI_SPECS where KPI_ID = " + id);
    ResultSet rs_names = ps_names.executeQuery();
    while (rs_names.next()) {
        out.println("<tr><td>" + rs_names.getString("KPI_GROUP_NAME") + "</td><td>" + rs_names.getString("DESCRIPTION") + "</td>");
    }
    rs_names.close();

    // get the number of minutes down for each month and availability %
    PreparedStatement ps_minsDown = conn.prepareStatement("select count(timestamp) from jagel_hq_log where timestamp > ? and timestamp < ? and kpi_id = " + id);
    //September
    startTime = (Long) hm.get("8_start");
    endTime = (Long) hm.get("8_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsSep*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //October
    startTime = (Long) hm.get("9_start");
    endTime = (Long) hm.get("9_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsOct*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //November
    startTime = (Long) hm.get("10_start");
    endTime = (Long) hm.get("10_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsNov*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }   
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //December
    startTime = (Long) hm.get("11_start");
    endTime = (Long) hm.get("11_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsDec*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //January
    startTime = (Long) hm.get("0_start");
    endTime = (Long) hm.get("0_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsJan*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //February
    startTime = (Long) hm.get("1_start");
    endTime = (Long) hm.get("1_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsFeb*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //March
    startTime = (Long) hm.get("2_start");
    endTime = (Long) hm.get("2_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsMar*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //April
    startTime = (Long) hm.get("3_start");
    endTime = (Long) hm.get("3_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsApr*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //May
    startTime = (Long) hm.get("4_start");
    endTime = (Long) hm.get("4_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsMay*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //June
    startTime = (Long) hm.get("5_start");
    endTime = (Long) hm.get("5_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsMay*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //July
    startTime = (Long) hm.get("6_start");
    endTime = (Long) hm.get("6_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsJul*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //August
    startTime = (Long) hm.get("7_start");
    endTime = (Long) hm.get("7_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsAug*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
    //YEAR
    startTime = (Long) hm.get("8_start");
    endTime = (Long) hm.get("7_end");
    ps_minsDown.setLong(1,startTime);
    ps_minsDown.setLong(2,endTime);
    rs_minsDown = ps_minsDown.executeQuery();
    rs_minsDown.next();
    mins_down = rs_minsDown.getInt("COUNT(TIMESTAMP)");
    avail = 100-(mins_down/minsYear*100);
    if(avail < 99.98) {
        colour=minAvail;
        }
    else if(avail < 100){
        colour=medAvail;
        }
    else {
        colour=maxAvail;
    }
    out.println("<td bgcolor=" + colour + ">" + mins_down + "</td><td bgcolor=" + colour + ">" + round.format(avail) + "%");
    rs_minsDown.close();
}
// close remaining result set and connection
rs_id.close();
conn.close();
%>
</table>
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0

ответ дан 9 December 2019 в 20:41

Сохранение значений в массиве позволит вам получить к ним доступ с помощью констант Calendar.Month

import java.util.Calendar;
import java.util.GregorianCalendar;

public class Cal {

    Long[] start = new Long[12];
    Long[] end = new Long[12];

    private void init(int year) {
        for (int month = 0; month < 12; month++) {
            Calendar cal = Calendar.getInstance();
            cal.clear();
            cal.set(year, month, 1, 0, 0, 0);
            start[month] = cal.getTimeInMillis();
            cal.clear();
            cal.set(year, month, 1);
            int lastDayofMonth = cal
                    .getActualMaximum(GregorianCalendar.DAY_OF_MONTH);
            cal.set(year, month, lastDayofMonth, 23, 59, 59);
            end[month] = cal.getTimeInMillis();
        }
    }

    public static void main(String[] args) {
        Cal cal = new Cal();
        cal.init(2010);

        System.out.println( "start:" + cal.start[Calendar.JANUARY]+ " - " + cal.end[Calendar.JANUARY ]);
    }

}

1

ответ дан 9 December 2019 в 20:41

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