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When to use Comparable[ ] in Java?
Is Java “pass-by-reference” or “pass-by-value”?How do I efficiently iterate over each entry in a Java Map?Does a finally block always get executed in Java?What is the difference between public, protected, package-private and private in Java?How do I read / convert an InputStream into a String in Java?When to use LinkedList over ArrayList in Java?How do I generate random integers within a specific range in Java?Comparing Java enum members: == or equals()?How do I convert a String to an int in Java?Creating a memory leak with Java
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I was watching over a code which was using Comparable[] as an array that is exactly working as a collection framework list.As the task was done easily by using it without too many loops, is it a good practice to use it for other data types?
public class MergeSortExample
public Comparable[] mergeSort(Comparable[] inputList)
if(inputList.length <= 1)
return inputList;
Comparable[] list1 = new Comparable[inputList.length/2];
Comparable[] list2 = new Comparable[inputList.length - list1.length];
System.arraycopy(inputList, 0, list1, 0, list1.length);
System.arraycopy(inputList, list1.length, list2, 0, list2.length);
mergeSort(list1);
mergeSort(list2);
merge(list1, list2, inputList);
return inputList;
public void merge(Comparable[] list1, Comparable[] list2, Comparable[] resultList)
int indexOfList1 = 0;
int indexOfList2 = 0;
int indexOfMergedList = 0;
while(indexOfList1 < list1.length && indexOfList2 < list2.length)
if(list1[indexOfList1].compareTo(list2[indexOfList2]) < 0)
resultList[indexOfMergedList] = list1[indexOfList1];
indexOfList1++;
else
resultList[indexOfMergedList] = list2[indexOfList2];
indexOfList2++;
indexOfMergedList++;
System.arraycopy(list1, indexOfList1, resultList, indexOfMergedList, list1.length - indexOfList1);
System.arraycopy(list2, indexOfList2, resultList, indexOfMergedList, list2.length - indexOfList2);
java comparable
asked Mar 23 at 18:23
Al-AminAl-Amin
13
add a comment |
I was watching over a code which was using Comparable[] as an array that is exactly working as a collection framework list.As the task was done easily by using it without too many loops, is it a good practice to use it for other data types?
public class MergeSortExample
public Comparable[] mergeSort(Comparable[] inputList)
if(inputList.length <= 1)
return inputList;
Comparable[] list1 = new Comparable[inputList.length/2];
Comparable[] list2 = new Comparable[inputList.length - list1.length];
System.arraycopy(inputList, 0, list1, 0, list1.length);
System.arraycopy(inputList, list1.length, list2, 0, list2.length);
mergeSort(list1);
mergeSort(list2);
merge(list1, list2, inputList);
return inputList;
public void merge(Comparable[] list1, Comparable[] list2, Comparable[] resultList)
int indexOfList1 = 0;
int indexOfList2 = 0;
int indexOfMergedList = 0;
while(indexOfList1 < list1.length && indexOfList2 < list2.length)
if(list1[indexOfList1].compareTo(list2[indexOfList2]) < 0)
resultList[indexOfMergedList] = list1[indexOfList1];
indexOfList1++;
else
resultList[indexOfMergedList] = list2[indexOfList2];
indexOfList2++;
indexOfMergedList++;
System.arraycopy(list1, indexOfList1, resultList, indexOfMergedList, list1.length - indexOfList1);
System.arraycopy(list2, indexOfList2, resultList, indexOfMergedList, list2.length - indexOfList2);
java comparable
asked Mar 23 at 18:23
Al-AminAl-Amin
13
2
Wut exactly are you asking? When to use an Array instead of a list? Or when to use theComparable-Interface?
– Jere
Mar 23 at 18:29
No benefit, but there is certainly a drawback: it’s a raw type. Compile with all warnings turned on, and you will see it for yourself.
– VGR
Mar 23 at 18:31
The raw type warning is not from the array though, it is because Comparable is used instead of for example Comparable<SomeClass>. The use of raw types is a separate thing. Perhaps this is legacy code from before generics were introduced when all types were raw.
– ewramner
Mar 23 at 18:53
add a comment |
I was watching over a code which was using Comparable[] as an array that is exactly working as a collection framework list.As the task was done easily by using it without too many loops, is it a good practice to use it for other data types?
public class MergeSortExample
public Comparable[] mergeSort(Comparable[] inputList)
if(inputList.length <= 1)
return inputList;
Comparable[] list1 = new Comparable[inputList.length/2];
Comparable[] list2 = new Comparable[inputList.length - list1.length];
System.arraycopy(inputList, 0, list1, 0, list1.length);
System.arraycopy(inputList, list1.length, list2, 0, list2.length);
mergeSort(list1);
mergeSort(list2);
merge(list1, list2, inputList);
return inputList;
public void merge(Comparable[] list1, Comparable[] list2, Comparable[] resultList)
int indexOfList1 = 0;
int indexOfList2 = 0;
int indexOfMergedList = 0;
while(indexOfList1 < list1.length && indexOfList2 < list2.length)
if(list1[indexOfList1].compareTo(list2[indexOfList2]) < 0)
resultList[indexOfMergedList] = list1[indexOfList1];
indexOfList1++;
else
resultList[indexOfMergedList] = list2[indexOfList2];
indexOfList2++;
indexOfMergedList++;
System.arraycopy(list1, indexOfList1, resultList, indexOfMergedList, list1.length - indexOfList1);
System.arraycopy(list2, indexOfList2, resultList, indexOfMergedList, list2.length - indexOfList2);
java comparable
asked Mar 23 at 18:23
Al-AminAl-Amin
13
I was watching over a code which was using Comparable[] as an array that is exactly working as a collection framework list.As the task was done easily by using it without too many loops, is it a good practice to use it for other data types?
public class MergeSortExample
public Comparable[] mergeSort(Comparable[] inputList)
if(inputList.length <= 1)
return inputList;
Comparable[] list1 = new Comparable[inputList.length/2];
Comparable[] list2 = new Comparable[inputList.length - list1.length];
System.arraycopy(inputList, 0, list1, 0, list1.length);
System.arraycopy(inputList, list1.length, list2, 0, list2.length);
mergeSort(list1);
mergeSort(list2);
merge(list1, list2, inputList);
return inputList;
public void merge(Comparable[] list1, Comparable[] list2, Comparable[] resultList)
int indexOfList1 = 0;
int indexOfList2 = 0;
int indexOfMergedList = 0;
while(indexOfList1 < list1.length && indexOfList2 < list2.length)
if(list1[indexOfList1].compareTo(list2[indexOfList2]) < 0)
resultList[indexOfMergedList] = list1[indexOfList1];
indexOfList1++;
else
resultList[indexOfMergedList] = list2[indexOfList2];
indexOfList2++;
indexOfMergedList++;
System.arraycopy(list1, indexOfList1, resultList, indexOfMergedList, list1.length - indexOfList1);
System.arraycopy(list2, indexOfList2, resultList, indexOfMergedList, list2.length - indexOfList2);
java comparable
java comparable
asked Mar 23 at 18:23
Al-AminAl-Amin
13
asked Mar 23 at 18:23
Al-AminAl-Amin
13
edited Mar 23 at 19:06
Al-Amin
asked Mar 23 at 18:23
Al-AminAl-Amin
13
asked Mar 23 at 18:23
Al-AminAl-Amin
13
asked Mar 23 at 18:23
Al-AminAl-Amin
13
13
2
Wut exactly are you asking? When to use an Array instead of a list? Or when to use theComparable-Interface?
– Jere
Mar 23 at 18:29
No benefit, but there is certainly a drawback: it’s a raw type. Compile with all warnings turned on, and you will see it for yourself.
– VGR
Mar 23 at 18:31
The raw type warning is not from the array though, it is because Comparable is used instead of for example Comparable<SomeClass>. The use of raw types is a separate thing. Perhaps this is legacy code from before generics were introduced when all types were raw.
– ewramner
Mar 23 at 18:53
add a comment |
2
Wut exactly are you asking? When to use an Array instead of a list? Or when to use theComparable-Interface?
– Jere
Mar 23 at 18:29
No benefit, but there is certainly a drawback: it’s a raw type. Compile with all warnings turned on, and you will see it for yourself.
– VGR
Mar 23 at 18:31
The raw type warning is not from the array though, it is because Comparable is used instead of for example Comparable<SomeClass>. The use of raw types is a separate thing. Perhaps this is legacy code from before generics were introduced when all types were raw.
– ewramner
Mar 23 at 18:53
2
2
Wut exactly are you asking? When to use an Array instead of a list? Or when to use the
Comparable-Interface?– Jere
Mar 23 at 18:29
Wut exactly are you asking? When to use an Array instead of a list? Or when to use the
Comparable-Interface?– Jere
Mar 23 at 18:29
No benefit, but there is certainly a drawback: it’s a raw type. Compile with all warnings turned on, and you will see it for yourself.
– VGR
Mar 23 at 18:31
No benefit, but there is certainly a drawback: it’s a raw type. Compile with all warnings turned on, and you will see it for yourself.
– VGR
Mar 23 at 18:31
The raw type warning is not from the array though, it is because Comparable is used instead of for example Comparable<SomeClass>. The use of raw types is a separate thing. Perhaps this is legacy code from before generics were introduced when all types were raw.
– ewramner
Mar 23 at 18:53
The raw type warning is not from the array though, it is because Comparable is used instead of for example Comparable<SomeClass>. The use of raw types is a separate thing. Perhaps this is legacy code from before generics were introduced when all types were raw.
– ewramner
Mar 23 at 18:53
add a comment |
1 Answer
1
active
oldest
votes
In the old days before generics, collections could only use Object and were not type-safe. Arrays have always been type-safe. In those days it was common to use arrays for that reason. In modern code I would normally prefer to use a list in general-purpose code, but there is nothing wrong with arrays. The collections are implemented using arrays internally and sometimes an array is just what you want. Hard to give a better answer without seeing more of your code!
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
add a comment |
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In the old days before generics, collections could only use Object and were not type-safe. Arrays have always been type-safe. In those days it was common to use arrays for that reason. In modern code I would normally prefer to use a list in general-purpose code, but there is nothing wrong with arrays. The collections are implemented using arrays internally and sometimes an array is just what you want. Hard to give a better answer without seeing more of your code!
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
add a comment |
In the old days before generics, collections could only use Object and were not type-safe. Arrays have always been type-safe. In those days it was common to use arrays for that reason. In modern code I would normally prefer to use a list in general-purpose code, but there is nothing wrong with arrays. The collections are implemented using arrays internally and sometimes an array is just what you want. Hard to give a better answer without seeing more of your code!
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
add a comment |
In the old days before generics, collections could only use Object and were not type-safe. Arrays have always been type-safe. In those days it was common to use arrays for that reason. In modern code I would normally prefer to use a list in general-purpose code, but there is nothing wrong with arrays. The collections are implemented using arrays internally and sometimes an array is just what you want. Hard to give a better answer without seeing more of your code!
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
In the old days before generics, collections could only use Object and were not type-safe. Arrays have always been type-safe. In those days it was common to use arrays for that reason. In modern code I would normally prefer to use a list in general-purpose code, but there is nothing wrong with arrays. The collections are implemented using arrays internally and sometimes an array is just what you want. Hard to give a better answer without seeing more of your code!
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
answered Mar 23 at 18:29
ewramnerewramner
4,01721226
4,01721226
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
add a comment |
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
I got your point.I think it's too old practice to use comparable array that's why i could not find any resource about it.thanks
– Al-Amin
Mar 24 at 5:24
add a comment |
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2
Wut exactly are you asking? When to use an Array instead of a list? Or when to use the
Comparable-Interface?– Jere
Mar 23 at 18:29
No benefit, but there is certainly a drawback: it’s a raw type. Compile with all warnings turned on, and you will see it for yourself.
– VGR
Mar 23 at 18:31
The raw type warning is not from the array though, it is because Comparable is used instead of for example Comparable<SomeClass>. The use of raw types is a separate thing. Perhaps this is legacy code from before generics were introduced when all types were raw.
– ewramner
Mar 23 at 18:53