The document contains Java code that prompts the user to input a date and a specific weather data type. It includes various methods for retrieving and processing weather data but is plagued by numerous syntax errors. The user encounters unresolved compilation problems mainly related to variable scope and incorrect syntax within the if-else statements.

1. Please fix the java code (using eclipse)
package hw4p1;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
public class MeanMedianHWv2 {
public static void main(String[] args) throws IOException {
String[] arrDate = { "", "", "","" };
Scanner in = new Scanner(System.in);
Boolean day = true;
// Year
do
{
System.out.println("Enter a year (2016)");
arrDate[0] = in.next();
if (!arrDate[0].equalsIgnoreCase("2016"))
{
System.out.println("Wrong Input. '2016' only! Try again.");
}
else
{
arrDate[0] = "2016";
}
} while(!arrDate[0].equalsIgnoreCase("2016"));
// Month
do

2. {
System.out.println("Enter a month (01)");
arrDate[1] = in.next();
if (!arrDate[1].equalsIgnoreCase("01"))
{
System.out.println("Wrong Input. '01' only! Try again!");
}
else
{
arrDate[1] = "01";
}
} while(!arrDate[1].equalsIgnoreCase("01"));
// Day
do
{
System.out.println("Enter a Day (04-10)");
arrDate[2] = in.next();
//if (arrDate[2] > 10 || arrDate[2] < 4)
if (!arrDate[2].equalsIgnoreCase("04"))
{
System.out.println("Wrong Inpit. '04' - '10' only! Try again!");
}
//else if (arrDate[2] == 4)
else if (!arrDate[2].equalsIgnoreCase("05"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("06"))
{

3. System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("07"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("08"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("09"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("10"))
{
System.out.println("Error! Invalid day. Try again!");
}
else
{
arrDate[2] = "04";
day = false;
arrDate[2] = "05";
day = false;
arrDate[2] = "06";
day = false;
arrDate[2] = "07";
day = false;
arrDate[2] = "08";
day = false;

4. arrDate[2] = "09";
day = false;
arrDate[2] = "10";
day = false;
}
} while (day);
do {
System.out.println("which data? 'w' for wind, 'b' for baro pressure, 't' for temp");
arrDate[3] = in.next();
if (!arrDate[3]. equalsIgnoreCase ("w") && !arrDate[3].equalsIgnoreCase("b") &&
!arrDate[3].equalsIgnoreCase("t"))
{
System.out.println("Wrong input. 'w' / 'b' / 't' only! Try again");
}
//while(!arrDate[2].equalsIgnoreCase("04") && !arrDate[2].equalsIgnoreCase("05") &&
!arrDate[2].equalsIgnoreCase("05"));
if (arrDate[3].equalsIgnoreCase("w"))
{
System.out.println("w");
}
else if (arrDate[3].equalsIgnoreCase("b"))
{
System.out.println("b");
}
else if (arrDate[3].equalsIgnoreCase("t"))
{
System.out.println("t");
}
} while (!arrDate[3].equalsIgnoreCase("w") && !arrDate[3].equalsIgnoreCase("b") &&
!arrDate[3].equalsIgnoreCase("t"));
in.close();
String Date = arrDate[0] + "_" + arrDate[1] + "_" + arrDate[2];
System.out.println("------------------------------------");

5. System.out.println("What you typed in is below");
System.out.println("Date" + Date);
System.out.println("Date :" + arrDate[3]);
System.out.println("-----------------------------------");
if (arrDate[3].equalsIgnoreCase("w"))
{
ArrayList windGust = getWindData(Date.arrDate);
System.out.println("Wind Gust");
System.out.println(" Results of" + Date + "");
System.out.println("mean :" + mean(windGust));
System.out.println("Median: " + median(windGust));
System.out.println("-----------------------------------");
}
else {arrDate[3].equalsIgnoreCase("b");
{
ArrayList pressure = getPData(Date, arrDate);
System.out.println("Pressure");
System.out.println(" Results of" + Date + "");
System.out.println("mean :" + mean(pressure));
System.out.println("Median: " + median(pressure));
System.out.println("-----------------------------------");
}
else
{
ArrayList airTemp = getTdata(Date, arrDate);
System.out.println("Temperature");
System.out.println(" Results of" + Date + "");
System.out.println("mean :" + mean(airTemp));
System.out.println("Median: " + median(airTemp));
System.out.println("-----------------------------------");
}
System.out.println("Printing all data");
ArrayListweaData = getAllData(Date, arrDate);
displayData(weaData);

6. }
// System.out.println("Sll Data");
// System.out.println(" Results of" + Date + "");
// else
// {
// ArrayList tempData = getbaroData(arrDate);
// }
//ArrayList barodata = getbaroData(arrDate);
//ArrayList airTemp = getData("Air_Temp", arrDate);
//ArrayList pressure = getData("Barometric_Press", arrDate);
// System.out.println("Gust: mean " + mean(windGust) + ", median " +
median(windGust));
// //System.out.println("Temp: mean " + mean(airTemp) + ", median " +
median(airTemp));
// //System.out.println("Pressure: mean " + mean(pressure) + ", median " +
median(pressure));
//
// displayData(weaData);
// }
// GEtting wind data
public static ArrayList getWindData(String Date, String [] arrDt) throws
NumberFormatException, IOException {
// construct the url if necessary
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] + "/" + label);
//URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/weather.txt");
//URL url = new URL("http://umd-
fmis.d.umn.edu/cpblee/data/2016/2016_01_04/2016_01_04.txt");
String newurl = "http://umd-fmis.d.umn.edu/cpblee/data/" + Date + "/" + Date + ".txt";
System.out.println("Searching " + newurl);

7. URL url = new URL(newurl);
//URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] +
"_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt/");
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
// get wind gust data
ArrayList windData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {
windData.add(Double.parseDouble(inputLine.substring(20,22)));
}
buffer.close();
return windData;
}
// Getting temp data.
public static ArrayList gettempData(String[] arrDt) throws NumberFormatException,
IOException {
// construct the url if necessary
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] + "/" + label); URL url = new
URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] + "_" + arrDt[1]
+ "_" + arrDt[2] +".txt/");
URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" +
arrDt[2] +".txt/");
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
// alternatively,

8. //BufferedReader data = new BufferedReader(new
InputStreamReader(dataSource.openStream()));
// get wind gust data
ArrayList tempData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {
tempData.add(Double.parseDouble(inputLine.substring(20)));
}
buffer.close();
return tempData;
}
// Getting Baro Data.
public static ArrayList getbaroData(String[] arrDt) throws NumberFormatException,
IOException {
// construct the url if necessary
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] + "/" + label); URL url = new
URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] + "_" + arrDt[1]
+ "_" + arrDt[2] +".txt/");
URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" +
arrDt[2] +".txt/");
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
// alternatively,
//BufferedReader data = new BufferedReader(new
InputStreamReader(dataSource.openStream()));
// get wind gust data
ArrayList baroData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {

9. baroData.add(Double.parseDouble(inputLine.substring(20)));
}
buffer.close();
return baroData;
}
//GEtting all data
public static ArrayList getAllData(String[] arrDt) throws NumberFormatException,
IOException {
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] + "/" + label);
//URL url = new URL("http://umd-
fmis.d.umn.edu/cpblee/data/2016/2016_01_04/2016_01_04.txt");
//URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" +
arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" +
arrDt[2] +".txt");
URL url = new URL ("http://umd-fmis.d.umn.edu/cpblee/data/2016/ + arrData[0] + “_”+
arrDt[1]” + “_” + arrDt[2]+“/”+“ arrDt[0]” + “_”+ “arrDt[1]” + “_” + arrDt[2]+“.txt”");
// http://umd-fmis.d.umn.edu/cpblee/data/2016/2016_01_04/2016_01_04.txt
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
//BufferedReader data = new BufferedReader(new
InputStreamReader(dataSource.openStream()));
// get date, time, and wind gust data (replicate data)
ArrayList allData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {
allData.add(inputLine.substring(0));
}

10. buffer.close();
return allData;
}
public static void displayData(ArrayList a) {
for (String s : a) {
System.out.println(s);
}
}
public static double mean(ArrayList a)
{
double sum = 0;
for (double i : a) {
sum += i;
}
return sum / a.size();
}
public static double median(ArrayList a)
{
Collections.sort(a);
if (a.size() / 2 * 2 == a.size()) {
return (a.get(a.size() / 2) + a.get(a.size() / 2 - 1)) / 2;
} else {
return a.get(a.size() / 2);
}
}
}
**** this is the error i am getting:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
arrDate cannot be resolved or is not a field
arrDate cannot be resolved to a variable
Syntax error on token "else", delete this token
arrDate cannot be resolved to a variable
arrDate cannot be resolved to a variable
Syntax error, insert "}" to complete Block
at hw4p1.MeanMedianHWv2.main(MeanMedianHWv2.java:153)

11. Solution
There is a minor mistake in the else block you wrote. You just mistyped it seems. An open
paranthesis ( should be there in the else if condition, but you used open braces { it seems. Here is
the modificeation for you:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
public class MeanMedian {
public static void main(String[] args) throws IOException {
String[] arrDate = { "", "", "","" };
Scanner in = new Scanner(System.in);
Boolean day = true;
// Year
do
{
System.out.println("Enter a year (2016)");
arrDate[0] = in.next();
if (!arrDate[0].equalsIgnoreCase("2016"))
{
System.out.println("Wrong Input. '2016' only! Try again.");
}
else
{
arrDate[0] = "2016";
}
} while(!arrDate[0].equalsIgnoreCase("2016"));

12. // Month
do
{
System.out.println("Enter a month (01)");
arrDate[1] = in.next();
if (!arrDate[1].equalsIgnoreCase("01"))
{
System.out.println("Wrong Input. '01' only! Try again!");
}
else
{
arrDate[1] = "01";
}
} while(!arrDate[1].equalsIgnoreCase("01"));
// Day
do
{
System.out.println("Enter a Day (04-10)");
arrDate[2] = in.next();
//if (arrDate[2] > 10 || arrDate[2] < 4)
if (!arrDate[2].equalsIgnoreCase("04"))
{
System.out.println("Wrong Inpit. '04' - '10' only! Try again!");
}
//else if (arrDate[2] == 4)
else if (!arrDate[2].equalsIgnoreCase("05"))
{
System.out.println("Error! Invalid day. Try again!");
}

13. else if (!arrDate[2].equalsIgnoreCase("06"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("07"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("08"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("09"))
{
System.out.println("Error! Invalid day. Try again!");
}
else if (!arrDate[2].equalsIgnoreCase("10"))
{
System.out.println("Error! Invalid day. Try again!");
}
else
{
arrDate[2] = "04";
day = false;
arrDate[2] = "05";
day = false;
arrDate[2] = "06";
day = false;
arrDate[2] = "07";

14. day = false;
arrDate[2] = "08";
day = false;
arrDate[2] = "09";
day = false;
arrDate[2] = "10";
day = false;
}
} while (day);
do {
System.out.println("which data? 'w' for wind, 'b' for baro pressure, 't' for temp");
arrDate[3] = in.next();
if (!arrDate[3]. equalsIgnoreCase ("w") && !arrDate[3].equalsIgnoreCase("b") &&
!arrDate[3].equalsIgnoreCase("t"))
{
System.out.println("Wrong input. 'w' / 'b' / 't' only! Try again");
}
//while(!arrDate[2].equalsIgnoreCase("04") && !arrDate[2].equalsIgnoreCase("05") &&
!arrDate[2].equalsIgnoreCase("05"));
if (arrDate[3].equalsIgnoreCase("w"))
{
System.out.println("w");
}
else if (arrDate[3].equalsIgnoreCase("b"))
{
System.out.println("b");
}
else if (arrDate[3].equalsIgnoreCase("t"))
{
System.out.println("t");
}
} while (!arrDate[3].equalsIgnoreCase("w") && !arrDate[3].equalsIgnoreCase("b") &&
!arrDate[3].equalsIgnoreCase("t"));
in.close();

15. String Date = arrDate[0] + "_" + arrDate[1] + "_" + arrDate[2];
System.out.println("------------------------------------");
System.out.println("What you typed in is below");
System.out.println("Date" + Date);
System.out.println("Date :" + arrDate[3]);
System.out.println("-----------------------------------");
if (arrDate[3].equalsIgnoreCase("w"))
{
ArrayList windGust = getWindData(Date.arrDate);
System.out.println("Wind Gust");
System.out.println(" Results of" + Date + "");
System.out.println("mean :" + mean(windGust));
System.out.println("Median: " + median(windGust));
System.out.println("-----------------------------------");
}
else if(arrDate[3].equalsIgnoreCase("b"))
{
ArrayList pressure = getPData(Date, arrDate);
System.out.println("Pressure");
System.out.println(" Results of" + Date + "");
System.out.println("mean :" + mean(pressure));
System.out.println("Median: " + median(pressure));
System.out.println("-----------------------------------");
}
else
{
ArrayList airTemp = getTdata(Date, arrDate);
System.out.println("Temperature");
System.out.println(" Results of" + Date + "");
System.out.println("mean :" + mean(airTemp));
System.out.println("Median: " + median(airTemp));
System.out.println("-----------------------------------");
}

16. System.out.println("Printing all data");
ArrayListweaData = getAllData(arrDate);
displayData(weaData);
}
// System.out.println("Sll Data");
// System.out.println(" Results of" + Date + "");
// else
// {
// ArrayList tempData = getbaroData(arrDate);
// }
//ArrayList barodata = getbaroData(arrDate);
//ArrayList airTemp = getData("Air_Temp", arrDate);
//ArrayList pressure = getData("Barometric_Press", arrDate);
// System.out.println("Gust: mean " + mean(windGust) + ", median " + median(windGust));
// //System.out.println("Temp: mean " + mean(airTemp) + ", median " + median(airTemp));
// //System.out.println("Pressure: mean " + mean(pressure) + ", median " +
median(pressure));
//
// displayData(weaData);
// }
// GEtting wind data
public static ArrayList getWindData(String Date, String [] arrDt) throws
NumberFormatException, IOException {
// construct the url if necessary
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" + arrDt[0]
+ "_" + arrDt[1] + "_" + arrDt[2] + "/" + label);
//URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/weather.txt");
//URL url = new URL("http://umd-
fmis.d.umn.edu/cpblee/data/2016/2016_01_04/2016_01_04.txt");
String newurl = "http://umd-fmis.d.umn.edu/cpblee/data/" + Date + "/" + Date + ".txt";

17. System.out.println("Searching " + newurl);
URL url = new URL(newurl);
//URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] +
"_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt/");
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
// get wind gust data
ArrayList windData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {
windData.add(Double.parseDouble(inputLine.substring(20,22)));
}
buffer.close();
return windData;
}
// Getting temp data.
public static ArrayList gettempData(String[] arrDt) throws NumberFormatException,
IOException {
// construct the url if necessary
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" + arrDt[0]
+ "_" + arrDt[1] + "_" + arrDt[2] + "/" + label); URL url = new URL("http://umd-
fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt/");
URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] +
"_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt/");
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));

18. // alternatively,
//BufferedReader data = new BufferedReader(new
InputStreamReader(dataSource.openStream()));
// get wind gust data
ArrayList tempData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {
tempData.add(Double.parseDouble(inputLine.substring(20)));
}
buffer.close();
return tempData;
}
// Getting Baro Data.
public static ArrayList getbaroData(String[] arrDt) throws NumberFormatException,
IOException {
// construct the url if necessary
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" + arrDt[0]
+ "_" + arrDt[1] + "_" + arrDt[2] + "/" + label); URL url = new URL("http://umd-
fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt/");
URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0] +
"_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt/");
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
// alternatively,
//BufferedReader data = new BufferedReader(new
InputStreamReader(dataSource.openStream()));
// get wind gust data
ArrayList baroData = new ArrayList();
String inputLine;

19. while ((inputLine = buffer.readLine()) != null) {
baroData.add(Double.parseDouble(inputLine.substring(20)));
}
buffer.close();
return baroData;
}
//GEtting all data
public static ArrayList getAllData(String[] arrDt) throws NumberFormatException,
IOException {
//URL dataSource = new URL("https://lpo.dt.navy.mil/data/DM/" + arrDt[0] + "/" + arrDt[0]
+ "_" + arrDt[1] + "_" + arrDt[2] + "/" + label);
//URL url = new URL("http://umd-
fmis.d.umn.edu/cpblee/data/2016/2016_01_04/2016_01_04.txt");
//URL url = new URL("http://umd-fmis.d.umn.edu/cpblee/data/" + arrDt[0] + "/" + arrDt[0]
+ "_" + arrDt[1] + "_" + arrDt[2] +"/" + arrDt[0] + "_" + arrDt[1] + "_" + arrDt[2]
+".txt");
URL url = new URL ("http://umd-fmis.d.umn.edu/cpblee/data/2016/ + arrData[0] + “_”+
arrDt[1]” + “_” + arrDt[2]+“/”+“ arrDt[0]” + “_”+ “arrDt[1]” + “_” + arrDt[2]+“.txt”");
// http://umd-fmis.d.umn.edu/cpblee/data/2016/2016_01_04/2016_01_04.txt
BufferedReader buffer = new BufferedReader(new
InputStreamReader(url.openConnection().getInputStream()));
//BufferedReader data = new BufferedReader(new
InputStreamReader(dataSource.openStream()));
// get date, time, and wind gust data (replicate data)
ArrayList allData = new ArrayList();
String inputLine;
while ((inputLine = buffer.readLine()) != null) {
allData.add(inputLine.substring(0));

20. }
buffer.close();
return allData;
}
public static void displayData(ArrayList a) {
for (String s : a) {
System.out.println(s);
}
}
public static double mean(ArrayList a)
{
double sum = 0;
for (double i : a) {
sum += i;
}
return sum / a.size();
}
public static double median(ArrayList a)
{
Collections.sort(a);
if (a.size() / 2 * 2 == a.size()) {
return (a.get(a.size() / 2) + a.get(a.size() / 2 - 1)) / 2;
} else {
return a.get(a.size() / 2);
}
}
}
And may be you tried some methods which are not here it seems. Anyways, if you still need any
refinements, just get back to me.