Array list return a double with the highest integer
I have a class DrugUseYear that contains a calculation method for the mean drug use used per month. The months are in an Enum class.
An trying to find the highest value within the means found.
I understand why my code is wrong but i am unsure on how to fix it.
public class Rainfall {
private DrugUseYear DrugUseYears;
public double calculateHighestMeanAnnualDrugUse(){
Arrays.sort(DrugUseYears);
double maxValue = DrugUseYears[DrugUseYears.length - 1];
return maxValue;
}
}
java
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
add a comment |
I have a class DrugUseYear that contains a calculation method for the mean drug use used per month. The months are in an Enum class.
An trying to find the highest value within the means found.
I understand why my code is wrong but i am unsure on how to fix it.
public class Rainfall {
private DrugUseYear DrugUseYears;
public double calculateHighestMeanAnnualDrugUse(){
Arrays.sort(DrugUseYears);
double maxValue = DrugUseYears[DrugUseYears.length - 1];
return maxValue;
}
}
java
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
The first thing to do is to read and try to understand the error message from the compiler. It's outputted for a reason: in order for you to read it. You can't initialize a variable of type double with an element of an array of DrugUseYear, because a DrugUseYear is not a double. It's a DrugUseYear.
– JB Nizet
Nov 14 '18 at 18:50
I would loop through the years and find the highest value. BTW a DrugUseYears is not a double. most likely you need to to get a field likegetMeanUse
– Peter Lawrey
Nov 14 '18 at 18:50
Follow proper naming conventions and keep your variable names lowercase:private DrugUseYear drugUseYears;Also,Arrays.sort()may struggle to sort classes without comparators, so you will likely not be sorting this array as you expect.
– Bucket
Nov 14 '18 at 18:50
add a comment |
I have a class DrugUseYear that contains a calculation method for the mean drug use used per month. The months are in an Enum class.
An trying to find the highest value within the means found.
I understand why my code is wrong but i am unsure on how to fix it.
public class Rainfall {
private DrugUseYear DrugUseYears;
public double calculateHighestMeanAnnualDrugUse(){
Arrays.sort(DrugUseYears);
double maxValue = DrugUseYears[DrugUseYears.length - 1];
return maxValue;
}
}
java
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
I have a class DrugUseYear that contains a calculation method for the mean drug use used per month. The months are in an Enum class.
An trying to find the highest value within the means found.
I understand why my code is wrong but i am unsure on how to fix it.
public class Rainfall {
private DrugUseYear DrugUseYears;
public double calculateHighestMeanAnnualDrugUse(){
Arrays.sort(DrugUseYears);
double maxValue = DrugUseYears[DrugUseYears.length - 1];
return maxValue;
}
}
java
java
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
edited Nov 14 '18 at 18:48
zengr
26.2k31110178
26.2k31110178
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
asked Nov 14 '18 at 18:48
Klyde MoradeyoKlyde Moradeyo
1
1
The first thing to do is to read and try to understand the error message from the compiler. It's outputted for a reason: in order for you to read it. You can't initialize a variable of type double with an element of an array of DrugUseYear, because a DrugUseYear is not a double. It's a DrugUseYear.
– JB Nizet
Nov 14 '18 at 18:50
I would loop through the years and find the highest value. BTW a DrugUseYears is not a double. most likely you need to to get a field likegetMeanUse
– Peter Lawrey
Nov 14 '18 at 18:50
Follow proper naming conventions and keep your variable names lowercase:private DrugUseYear drugUseYears;Also,Arrays.sort()may struggle to sort classes without comparators, so you will likely not be sorting this array as you expect.
– Bucket
Nov 14 '18 at 18:50
add a comment |
The first thing to do is to read and try to understand the error message from the compiler. It's outputted for a reason: in order for you to read it. You can't initialize a variable of type double with an element of an array of DrugUseYear, because a DrugUseYear is not a double. It's a DrugUseYear.
– JB Nizet
Nov 14 '18 at 18:50
I would loop through the years and find the highest value. BTW a DrugUseYears is not a double. most likely you need to to get a field likegetMeanUse
– Peter Lawrey
Nov 14 '18 at 18:50
Follow proper naming conventions and keep your variable names lowercase:private DrugUseYear drugUseYears;Also,Arrays.sort()may struggle to sort classes without comparators, so you will likely not be sorting this array as you expect.
– Bucket
Nov 14 '18 at 18:50
The first thing to do is to read and try to understand the error message from the compiler. It's outputted for a reason: in order for you to read it. You can't initialize a variable of type double with an element of an array of DrugUseYear, because a DrugUseYear is not a double. It's a DrugUseYear.
– JB Nizet
Nov 14 '18 at 18:50
The first thing to do is to read and try to understand the error message from the compiler. It's outputted for a reason: in order for you to read it. You can't initialize a variable of type double with an element of an array of DrugUseYear, because a DrugUseYear is not a double. It's a DrugUseYear.
– JB Nizet
Nov 14 '18 at 18:50
I would loop through the years and find the highest value. BTW a DrugUseYears is not a double. most likely you need to to get a field like
getMeanUse– Peter Lawrey
Nov 14 '18 at 18:50
I would loop through the years and find the highest value. BTW a DrugUseYears is not a double. most likely you need to to get a field like
getMeanUse– Peter Lawrey
Nov 14 '18 at 18:50
Follow proper naming conventions and keep your variable names lowercase:
private DrugUseYear drugUseYears; Also, Arrays.sort() may struggle to sort classes without comparators, so you will likely not be sorting this array as you expect.– Bucket
Nov 14 '18 at 18:50
Follow proper naming conventions and keep your variable names lowercase:
private DrugUseYear drugUseYears; Also, Arrays.sort() may struggle to sort classes without comparators, so you will likely not be sorting this array as you expect.– Bucket
Nov 14 '18 at 18:50
add a comment |
1 Answer
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This is incorrect:
double maxValue = DrugUseYears[DrugUseYears.length - 1];
because accessing DrugUseYears array will return an object of type DrugUseYear. You need something like:
double maxValue = DrugUseYears[DrugUseYears.length - 1].getValueToSortBy();
But also this is probably incorrect:
Arrays.sort(DrugUseYears);
To sort object of class DrugUseYear, you need to either implement Comparable interface for that class (which you did not mention doing) or provide a comparator to sort() method:
Arrays.sort(array, new Comparator<DrugUseYear>() {
@Override
public int compare(DrugUseYear o1, DrugUseYear o2) {
return Double.compare(o1.getValueToSortBy(), o2.getValueToSortBy());
}
});
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
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oldest
votes
This is incorrect:
double maxValue = DrugUseYears[DrugUseYears.length - 1];
because accessing DrugUseYears array will return an object of type DrugUseYear. You need something like:
double maxValue = DrugUseYears[DrugUseYears.length - 1].getValueToSortBy();
But also this is probably incorrect:
Arrays.sort(DrugUseYears);
To sort object of class DrugUseYear, you need to either implement Comparable interface for that class (which you did not mention doing) or provide a comparator to sort() method:
Arrays.sort(array, new Comparator<DrugUseYear>() {
@Override
public int compare(DrugUseYear o1, DrugUseYear o2) {
return Double.compare(o1.getValueToSortBy(), o2.getValueToSortBy());
}
});
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
add a comment |
This is incorrect:
double maxValue = DrugUseYears[DrugUseYears.length - 1];
because accessing DrugUseYears array will return an object of type DrugUseYear. You need something like:
double maxValue = DrugUseYears[DrugUseYears.length - 1].getValueToSortBy();
But also this is probably incorrect:
Arrays.sort(DrugUseYears);
To sort object of class DrugUseYear, you need to either implement Comparable interface for that class (which you did not mention doing) or provide a comparator to sort() method:
Arrays.sort(array, new Comparator<DrugUseYear>() {
@Override
public int compare(DrugUseYear o1, DrugUseYear o2) {
return Double.compare(o1.getValueToSortBy(), o2.getValueToSortBy());
}
});
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
add a comment |
This is incorrect:
double maxValue = DrugUseYears[DrugUseYears.length - 1];
because accessing DrugUseYears array will return an object of type DrugUseYear. You need something like:
double maxValue = DrugUseYears[DrugUseYears.length - 1].getValueToSortBy();
But also this is probably incorrect:
Arrays.sort(DrugUseYears);
To sort object of class DrugUseYear, you need to either implement Comparable interface for that class (which you did not mention doing) or provide a comparator to sort() method:
Arrays.sort(array, new Comparator<DrugUseYear>() {
@Override
public int compare(DrugUseYear o1, DrugUseYear o2) {
return Double.compare(o1.getValueToSortBy(), o2.getValueToSortBy());
}
});
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
This is incorrect:
double maxValue = DrugUseYears[DrugUseYears.length - 1];
because accessing DrugUseYears array will return an object of type DrugUseYear. You need something like:
double maxValue = DrugUseYears[DrugUseYears.length - 1].getValueToSortBy();
But also this is probably incorrect:
Arrays.sort(DrugUseYears);
To sort object of class DrugUseYear, you need to either implement Comparable interface for that class (which you did not mention doing) or provide a comparator to sort() method:
Arrays.sort(array, new Comparator<DrugUseYear>() {
@Override
public int compare(DrugUseYear o1, DrugUseYear o2) {
return Double.compare(o1.getValueToSortBy(), o2.getValueToSortBy());
}
});
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
answered Nov 14 '18 at 19:07
syntagmasyntagma
12.8k1249106
12.8k1249106
add a comment |
add a comment |
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The first thing to do is to read and try to understand the error message from the compiler. It's outputted for a reason: in order for you to read it. You can't initialize a variable of type double with an element of an array of DrugUseYear, because a DrugUseYear is not a double. It's a DrugUseYear.
– JB Nizet
Nov 14 '18 at 18:50
I would loop through the years and find the highest value. BTW a DrugUseYears is not a double. most likely you need to to get a field like
getMeanUse– Peter Lawrey
Nov 14 '18 at 18:50
Follow proper naming conventions and keep your variable names lowercase:
private DrugUseYear drugUseYears;Also,Arrays.sort()may struggle to sort classes without comparators, so you will likely not be sorting this array as you expect.– Bucket
Nov 14 '18 at 18:50