Generate ranges in java












-2














I am trying to generate ranges from input batchSize and batchInterval. But, I am missing some batches due to the logic issues.



I am getting a batch of records from a SQL DB. Due to the huge latency in data transfer the downstream services are having issues. Therefore, I would like to batch query the data.



select * from table WHERE RN > ? AND RN <= ?


The two questions marks are lower and upper bound in the ranges



public class Ranges {

public static void main(String args) {
int batchTotal= 605;
int batchInterval = 100;

System.out.println(generateBatches(batchTotal, batchInterval).toString());

batchTotal = 605;
batchInterval = 5;

System.out.println(generateBatches(batchTotal, batchInterval).toString());
}

public static Set<String> generateBatches(int batchTotal, int batchInterval) {
int rangeLower = 0;
int rangeUpper = 0;
Set<String> ranges = new TreeSet<String>();
int numberOfIterableBatches = 0;
if (batchTotal < batchInterval) {
ranges.add(rangeLower + " - " + batchInterval);
} else {
numberOfIterableBatches = (int) java.lang.Math.ceil(batchTotal / batchInterval);
System.out.println(numberOfIterableBatches);
for (int i = 0; i <= numberOfIterableBatches; i++) {
if (i == 0) {
rangeLower = 0;
rangeUpper = i + 1;
} else {
rangeLower = i - 1;
rangeUpper = i;
}
ranges.add(rangeLower + " - " + rangeUpper);
}
}

return ranges;
}

}


When I am using List<String> I am getting duplicates. Therefore I am using Set<String>. Here is the sample output



6
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6]
121
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6, 6 - 7, 7 - 8, 8 - 9, 9 - 10, 10 - 11, 11 - 12, 12 - 13, 13 - 14, 14 - 15, 15 - 16, 16 - 17, 17 - 18, 18 - 19, 19 - 20, 20 - 21, 21 - 22, 22 - 23, 23 - 24, 24 - 25, 25 - 26, 26 - 27, 27 - 28, 28 - 29, 29 - 30, 30 - 31, 31 - 32, 32 - 33, 33 - 34, 34 - 35, 35 - 36, 36 - 37, 37 - 38, 38 - 39, 39 - 40, 40 - 41, 41 - 42, 42 - 43, 43 - 44, 44 - 45, 45 - 46, 46 - 47, 47 - 48, 48 - 49, 49 - 50, 50 - 51, 51 - 52, 52 - 53, 53 - 54, 54 - 55, 55 - 56, 56 - 57, 57 - 58, 58 - 59, 59 - 60, 60 - 61, 61 - 62, 62 - 63, 63 - 64, 64 - 65, 65 - 66, 66 - 67, 67 - 68, 68 - 69, 69 - 70, 70 - 71, 71 - 72, 72 - 73, 73 - 74, 74 - 75, 75 - 76, 76 - 77, 77 - 78, 78 - 79, 79 - 80, 80 - 81, 81 - 82, 82 - 83, 83 - 84, 84 - 85, 85 - 86, 86 - 87, 87 - 88, 88 - 89, 89 - 90, 90 - 91, 91 - 92, 92 - 93, 93 - 94, 94 - 95, 95 - 96, 96 - 97, 97 - 98, 98 - 99, 99 - 100, 100 - 101, 101 - 102, 102 - 103, 103 - 104, 104 - 105, 105 - 106, 106 - 107, 107 - 108, 108 - 109, 109 - 110, 110 - 111, 111 - 112, 112 - 113, 113 - 114, 114 - 115, 115 - 116, 116 - 117, 117 - 118, 118 - 119, 119 - 120, 120 - 121]









share|improve this question




















  • 3




    What's the output you're getting? What's the output you were trying to achieve?
    – Mark
    Nov 14 '18 at 14:06






  • 1




    Not related to your issue but you should rename your variables. Both main method and generateBatches has a batchSize argument but they don't match. That's quite misleading.
    – jhamon
    Nov 14 '18 at 14:11












  • Much better. But then: you better drop that "is there any library" part, because that renders the question off topic. And I am still not sure what you consider "wrong" about the code snippet you provided.
    – GhostCat
    Nov 14 '18 at 15:23










  • @GhostCat If my BatchSize is 506 or 1005 i am missing some records thats my problem.
    – wandermonk
    Nov 14 '18 at 16:06










  • In Postgres you can use LIMIT and OFFSET (see postgresql.org/docs/11/queries-limit.html), does your database have something similar?
    – Robert
    Nov 14 '18 at 16:51
















-2














I am trying to generate ranges from input batchSize and batchInterval. But, I am missing some batches due to the logic issues.



I am getting a batch of records from a SQL DB. Due to the huge latency in data transfer the downstream services are having issues. Therefore, I would like to batch query the data.



select * from table WHERE RN > ? AND RN <= ?


The two questions marks are lower and upper bound in the ranges



public class Ranges {

public static void main(String args) {
int batchTotal= 605;
int batchInterval = 100;

System.out.println(generateBatches(batchTotal, batchInterval).toString());

batchTotal = 605;
batchInterval = 5;

System.out.println(generateBatches(batchTotal, batchInterval).toString());
}

public static Set<String> generateBatches(int batchTotal, int batchInterval) {
int rangeLower = 0;
int rangeUpper = 0;
Set<String> ranges = new TreeSet<String>();
int numberOfIterableBatches = 0;
if (batchTotal < batchInterval) {
ranges.add(rangeLower + " - " + batchInterval);
} else {
numberOfIterableBatches = (int) java.lang.Math.ceil(batchTotal / batchInterval);
System.out.println(numberOfIterableBatches);
for (int i = 0; i <= numberOfIterableBatches; i++) {
if (i == 0) {
rangeLower = 0;
rangeUpper = i + 1;
} else {
rangeLower = i - 1;
rangeUpper = i;
}
ranges.add(rangeLower + " - " + rangeUpper);
}
}

return ranges;
}

}


When I am using List<String> I am getting duplicates. Therefore I am using Set<String>. Here is the sample output



6
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6]
121
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6, 6 - 7, 7 - 8, 8 - 9, 9 - 10, 10 - 11, 11 - 12, 12 - 13, 13 - 14, 14 - 15, 15 - 16, 16 - 17, 17 - 18, 18 - 19, 19 - 20, 20 - 21, 21 - 22, 22 - 23, 23 - 24, 24 - 25, 25 - 26, 26 - 27, 27 - 28, 28 - 29, 29 - 30, 30 - 31, 31 - 32, 32 - 33, 33 - 34, 34 - 35, 35 - 36, 36 - 37, 37 - 38, 38 - 39, 39 - 40, 40 - 41, 41 - 42, 42 - 43, 43 - 44, 44 - 45, 45 - 46, 46 - 47, 47 - 48, 48 - 49, 49 - 50, 50 - 51, 51 - 52, 52 - 53, 53 - 54, 54 - 55, 55 - 56, 56 - 57, 57 - 58, 58 - 59, 59 - 60, 60 - 61, 61 - 62, 62 - 63, 63 - 64, 64 - 65, 65 - 66, 66 - 67, 67 - 68, 68 - 69, 69 - 70, 70 - 71, 71 - 72, 72 - 73, 73 - 74, 74 - 75, 75 - 76, 76 - 77, 77 - 78, 78 - 79, 79 - 80, 80 - 81, 81 - 82, 82 - 83, 83 - 84, 84 - 85, 85 - 86, 86 - 87, 87 - 88, 88 - 89, 89 - 90, 90 - 91, 91 - 92, 92 - 93, 93 - 94, 94 - 95, 95 - 96, 96 - 97, 97 - 98, 98 - 99, 99 - 100, 100 - 101, 101 - 102, 102 - 103, 103 - 104, 104 - 105, 105 - 106, 106 - 107, 107 - 108, 108 - 109, 109 - 110, 110 - 111, 111 - 112, 112 - 113, 113 - 114, 114 - 115, 115 - 116, 116 - 117, 117 - 118, 118 - 119, 119 - 120, 120 - 121]









share|improve this question




















  • 3




    What's the output you're getting? What's the output you were trying to achieve?
    – Mark
    Nov 14 '18 at 14:06






  • 1




    Not related to your issue but you should rename your variables. Both main method and generateBatches has a batchSize argument but they don't match. That's quite misleading.
    – jhamon
    Nov 14 '18 at 14:11












  • Much better. But then: you better drop that "is there any library" part, because that renders the question off topic. And I am still not sure what you consider "wrong" about the code snippet you provided.
    – GhostCat
    Nov 14 '18 at 15:23










  • @GhostCat If my BatchSize is 506 or 1005 i am missing some records thats my problem.
    – wandermonk
    Nov 14 '18 at 16:06










  • In Postgres you can use LIMIT and OFFSET (see postgresql.org/docs/11/queries-limit.html), does your database have something similar?
    – Robert
    Nov 14 '18 at 16:51














-2












-2








-2







I am trying to generate ranges from input batchSize and batchInterval. But, I am missing some batches due to the logic issues.



I am getting a batch of records from a SQL DB. Due to the huge latency in data transfer the downstream services are having issues. Therefore, I would like to batch query the data.



select * from table WHERE RN > ? AND RN <= ?


The two questions marks are lower and upper bound in the ranges



public class Ranges {

public static void main(String args) {
int batchTotal= 605;
int batchInterval = 100;

System.out.println(generateBatches(batchTotal, batchInterval).toString());

batchTotal = 605;
batchInterval = 5;

System.out.println(generateBatches(batchTotal, batchInterval).toString());
}

public static Set<String> generateBatches(int batchTotal, int batchInterval) {
int rangeLower = 0;
int rangeUpper = 0;
Set<String> ranges = new TreeSet<String>();
int numberOfIterableBatches = 0;
if (batchTotal < batchInterval) {
ranges.add(rangeLower + " - " + batchInterval);
} else {
numberOfIterableBatches = (int) java.lang.Math.ceil(batchTotal / batchInterval);
System.out.println(numberOfIterableBatches);
for (int i = 0; i <= numberOfIterableBatches; i++) {
if (i == 0) {
rangeLower = 0;
rangeUpper = i + 1;
} else {
rangeLower = i - 1;
rangeUpper = i;
}
ranges.add(rangeLower + " - " + rangeUpper);
}
}

return ranges;
}

}


When I am using List<String> I am getting duplicates. Therefore I am using Set<String>. Here is the sample output



6
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6]
121
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6, 6 - 7, 7 - 8, 8 - 9, 9 - 10, 10 - 11, 11 - 12, 12 - 13, 13 - 14, 14 - 15, 15 - 16, 16 - 17, 17 - 18, 18 - 19, 19 - 20, 20 - 21, 21 - 22, 22 - 23, 23 - 24, 24 - 25, 25 - 26, 26 - 27, 27 - 28, 28 - 29, 29 - 30, 30 - 31, 31 - 32, 32 - 33, 33 - 34, 34 - 35, 35 - 36, 36 - 37, 37 - 38, 38 - 39, 39 - 40, 40 - 41, 41 - 42, 42 - 43, 43 - 44, 44 - 45, 45 - 46, 46 - 47, 47 - 48, 48 - 49, 49 - 50, 50 - 51, 51 - 52, 52 - 53, 53 - 54, 54 - 55, 55 - 56, 56 - 57, 57 - 58, 58 - 59, 59 - 60, 60 - 61, 61 - 62, 62 - 63, 63 - 64, 64 - 65, 65 - 66, 66 - 67, 67 - 68, 68 - 69, 69 - 70, 70 - 71, 71 - 72, 72 - 73, 73 - 74, 74 - 75, 75 - 76, 76 - 77, 77 - 78, 78 - 79, 79 - 80, 80 - 81, 81 - 82, 82 - 83, 83 - 84, 84 - 85, 85 - 86, 86 - 87, 87 - 88, 88 - 89, 89 - 90, 90 - 91, 91 - 92, 92 - 93, 93 - 94, 94 - 95, 95 - 96, 96 - 97, 97 - 98, 98 - 99, 99 - 100, 100 - 101, 101 - 102, 102 - 103, 103 - 104, 104 - 105, 105 - 106, 106 - 107, 107 - 108, 108 - 109, 109 - 110, 110 - 111, 111 - 112, 112 - 113, 113 - 114, 114 - 115, 115 - 116, 116 - 117, 117 - 118, 118 - 119, 119 - 120, 120 - 121]









share|improve this question















I am trying to generate ranges from input batchSize and batchInterval. But, I am missing some batches due to the logic issues.



I am getting a batch of records from a SQL DB. Due to the huge latency in data transfer the downstream services are having issues. Therefore, I would like to batch query the data.



select * from table WHERE RN > ? AND RN <= ?


The two questions marks are lower and upper bound in the ranges



public class Ranges {

public static void main(String args) {
int batchTotal= 605;
int batchInterval = 100;

System.out.println(generateBatches(batchTotal, batchInterval).toString());

batchTotal = 605;
batchInterval = 5;

System.out.println(generateBatches(batchTotal, batchInterval).toString());
}

public static Set<String> generateBatches(int batchTotal, int batchInterval) {
int rangeLower = 0;
int rangeUpper = 0;
Set<String> ranges = new TreeSet<String>();
int numberOfIterableBatches = 0;
if (batchTotal < batchInterval) {
ranges.add(rangeLower + " - " + batchInterval);
} else {
numberOfIterableBatches = (int) java.lang.Math.ceil(batchTotal / batchInterval);
System.out.println(numberOfIterableBatches);
for (int i = 0; i <= numberOfIterableBatches; i++) {
if (i == 0) {
rangeLower = 0;
rangeUpper = i + 1;
} else {
rangeLower = i - 1;
rangeUpper = i;
}
ranges.add(rangeLower + " - " + rangeUpper);
}
}

return ranges;
}

}


When I am using List<String> I am getting duplicates. Therefore I am using Set<String>. Here is the sample output



6
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6]
121
[0 - 1, 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6, 6 - 7, 7 - 8, 8 - 9, 9 - 10, 10 - 11, 11 - 12, 12 - 13, 13 - 14, 14 - 15, 15 - 16, 16 - 17, 17 - 18, 18 - 19, 19 - 20, 20 - 21, 21 - 22, 22 - 23, 23 - 24, 24 - 25, 25 - 26, 26 - 27, 27 - 28, 28 - 29, 29 - 30, 30 - 31, 31 - 32, 32 - 33, 33 - 34, 34 - 35, 35 - 36, 36 - 37, 37 - 38, 38 - 39, 39 - 40, 40 - 41, 41 - 42, 42 - 43, 43 - 44, 44 - 45, 45 - 46, 46 - 47, 47 - 48, 48 - 49, 49 - 50, 50 - 51, 51 - 52, 52 - 53, 53 - 54, 54 - 55, 55 - 56, 56 - 57, 57 - 58, 58 - 59, 59 - 60, 60 - 61, 61 - 62, 62 - 63, 63 - 64, 64 - 65, 65 - 66, 66 - 67, 67 - 68, 68 - 69, 69 - 70, 70 - 71, 71 - 72, 72 - 73, 73 - 74, 74 - 75, 75 - 76, 76 - 77, 77 - 78, 78 - 79, 79 - 80, 80 - 81, 81 - 82, 82 - 83, 83 - 84, 84 - 85, 85 - 86, 86 - 87, 87 - 88, 88 - 89, 89 - 90, 90 - 91, 91 - 92, 92 - 93, 93 - 94, 94 - 95, 95 - 96, 96 - 97, 97 - 98, 98 - 99, 99 - 100, 100 - 101, 101 - 102, 102 - 103, 103 - 104, 104 - 105, 105 - 106, 106 - 107, 107 - 108, 108 - 109, 109 - 110, 110 - 111, 111 - 112, 112 - 113, 113 - 114, 114 - 115, 115 - 116, 116 - 117, 117 - 118, 118 - 119, 119 - 120, 120 - 121]






java






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 14 '18 at 15:57

























asked Nov 14 '18 at 14:02









wandermonk

1,45021239




1,45021239








  • 3




    What's the output you're getting? What's the output you were trying to achieve?
    – Mark
    Nov 14 '18 at 14:06






  • 1




    Not related to your issue but you should rename your variables. Both main method and generateBatches has a batchSize argument but they don't match. That's quite misleading.
    – jhamon
    Nov 14 '18 at 14:11












  • Much better. But then: you better drop that "is there any library" part, because that renders the question off topic. And I am still not sure what you consider "wrong" about the code snippet you provided.
    – GhostCat
    Nov 14 '18 at 15:23










  • @GhostCat If my BatchSize is 506 or 1005 i am missing some records thats my problem.
    – wandermonk
    Nov 14 '18 at 16:06










  • In Postgres you can use LIMIT and OFFSET (see postgresql.org/docs/11/queries-limit.html), does your database have something similar?
    – Robert
    Nov 14 '18 at 16:51














  • 3




    What's the output you're getting? What's the output you were trying to achieve?
    – Mark
    Nov 14 '18 at 14:06






  • 1




    Not related to your issue but you should rename your variables. Both main method and generateBatches has a batchSize argument but they don't match. That's quite misleading.
    – jhamon
    Nov 14 '18 at 14:11












  • Much better. But then: you better drop that "is there any library" part, because that renders the question off topic. And I am still not sure what you consider "wrong" about the code snippet you provided.
    – GhostCat
    Nov 14 '18 at 15:23










  • @GhostCat If my BatchSize is 506 or 1005 i am missing some records thats my problem.
    – wandermonk
    Nov 14 '18 at 16:06










  • In Postgres you can use LIMIT and OFFSET (see postgresql.org/docs/11/queries-limit.html), does your database have something similar?
    – Robert
    Nov 14 '18 at 16:51








3




3




What's the output you're getting? What's the output you were trying to achieve?
– Mark
Nov 14 '18 at 14:06




What's the output you're getting? What's the output you were trying to achieve?
– Mark
Nov 14 '18 at 14:06




1




1




Not related to your issue but you should rename your variables. Both main method and generateBatches has a batchSize argument but they don't match. That's quite misleading.
– jhamon
Nov 14 '18 at 14:11






Not related to your issue but you should rename your variables. Both main method and generateBatches has a batchSize argument but they don't match. That's quite misleading.
– jhamon
Nov 14 '18 at 14:11














Much better. But then: you better drop that "is there any library" part, because that renders the question off topic. And I am still not sure what you consider "wrong" about the code snippet you provided.
– GhostCat
Nov 14 '18 at 15:23




Much better. But then: you better drop that "is there any library" part, because that renders the question off topic. And I am still not sure what you consider "wrong" about the code snippet you provided.
– GhostCat
Nov 14 '18 at 15:23












@GhostCat If my BatchSize is 506 or 1005 i am missing some records thats my problem.
– wandermonk
Nov 14 '18 at 16:06




@GhostCat If my BatchSize is 506 or 1005 i am missing some records thats my problem.
– wandermonk
Nov 14 '18 at 16:06












In Postgres you can use LIMIT and OFFSET (see postgresql.org/docs/11/queries-limit.html), does your database have something similar?
– Robert
Nov 14 '18 at 16:51




In Postgres you can use LIMIT and OFFSET (see postgresql.org/docs/11/queries-limit.html), does your database have something similar?
– Robert
Nov 14 '18 at 16:51












2 Answers
2






active

oldest

votes


















0














The code is unnecessarily complicated or I misunderstood the question :)



public class Ranges {

public static void main(String args) {
int batchTotal = 605;
int batchInterval = 100;

System.out.println(generateBatches(batchTotal, batchInterval).toString());

batchTotal = 605;
batchInterval = 5;

System.out.println(generateBatches(batchTotal, batchInterval).toString());
}

public static List<String> generateBatches(int batchTotal, int batchInterval) {
List<String> ranges = new ArrayList<String>();
int n = batchTotal;
int rangeStart = 0;
while (n > 0) {
ranges.add(rangeStart + "-" + ((rangeStart + batchInterval) > batchTotal ? batchTotal : rangeStart + batchInterval));
rangeStart += batchInterval;
n -= batchInterval;
}
return ranges;
}

}





share|improve this answer





















  • You have a point!! I made it very complex. Thanks for making it so simple.
    – wandermonk
    Nov 14 '18 at 18:13



















0














Take a look at Iterables in the guava library:



public static <T> Iterable<List<T>> partition(Iterable<T> iterable, int size)



You could use it like this:



int outerLowerBound = 0;    
int outerUpperBound = 605;
int numberOfParts = 5;

List<Integer> collect = IntStream.range(outerLowerBound, outerUpperBound)
.boxed().collect(Collectors.toList());
Iterable<List<Integer>> partitions = Iterables.partition(collect, numberOfParts);


Inside the partitions list are your intervals. Then for each interval; 1st item is lower bound and last item is upper bound.



for (List<Integer> partition : partitions) {
System.out.println("[ " + Iterables.getFirst(partition, 0) + ", " + Iterables.getLast(partition) + " ]");
}


Output:



[ 1, 5 ]
[ 6, 10 ]
[ 11, 15 ]
[ 16, 20 ]
[ 21, 25 ]
[ 26, 30 ]
[ 31, 35 ]
...
[ 581, 585 ]
[ 586, 590 ]
[ 591, 595 ]
[ 596, 600 ]
[ 601, 604 ]


See doc:



https://google.github.io/guava/releases/21.0/api/docs/com/google/common/collect/Iterables.html#partition-java.lang.Iterable-int-






share|improve this answer























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    2 Answers
    2






    active

    oldest

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    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    0














    The code is unnecessarily complicated or I misunderstood the question :)



    public class Ranges {

    public static void main(String args) {
    int batchTotal = 605;
    int batchInterval = 100;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());

    batchTotal = 605;
    batchInterval = 5;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());
    }

    public static List<String> generateBatches(int batchTotal, int batchInterval) {
    List<String> ranges = new ArrayList<String>();
    int n = batchTotal;
    int rangeStart = 0;
    while (n > 0) {
    ranges.add(rangeStart + "-" + ((rangeStart + batchInterval) > batchTotal ? batchTotal : rangeStart + batchInterval));
    rangeStart += batchInterval;
    n -= batchInterval;
    }
    return ranges;
    }

    }





    share|improve this answer





















    • You have a point!! I made it very complex. Thanks for making it so simple.
      – wandermonk
      Nov 14 '18 at 18:13
















    0














    The code is unnecessarily complicated or I misunderstood the question :)



    public class Ranges {

    public static void main(String args) {
    int batchTotal = 605;
    int batchInterval = 100;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());

    batchTotal = 605;
    batchInterval = 5;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());
    }

    public static List<String> generateBatches(int batchTotal, int batchInterval) {
    List<String> ranges = new ArrayList<String>();
    int n = batchTotal;
    int rangeStart = 0;
    while (n > 0) {
    ranges.add(rangeStart + "-" + ((rangeStart + batchInterval) > batchTotal ? batchTotal : rangeStart + batchInterval));
    rangeStart += batchInterval;
    n -= batchInterval;
    }
    return ranges;
    }

    }





    share|improve this answer





















    • You have a point!! I made it very complex. Thanks for making it so simple.
      – wandermonk
      Nov 14 '18 at 18:13














    0












    0








    0






    The code is unnecessarily complicated or I misunderstood the question :)



    public class Ranges {

    public static void main(String args) {
    int batchTotal = 605;
    int batchInterval = 100;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());

    batchTotal = 605;
    batchInterval = 5;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());
    }

    public static List<String> generateBatches(int batchTotal, int batchInterval) {
    List<String> ranges = new ArrayList<String>();
    int n = batchTotal;
    int rangeStart = 0;
    while (n > 0) {
    ranges.add(rangeStart + "-" + ((rangeStart + batchInterval) > batchTotal ? batchTotal : rangeStart + batchInterval));
    rangeStart += batchInterval;
    n -= batchInterval;
    }
    return ranges;
    }

    }





    share|improve this answer












    The code is unnecessarily complicated or I misunderstood the question :)



    public class Ranges {

    public static void main(String args) {
    int batchTotal = 605;
    int batchInterval = 100;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());

    batchTotal = 605;
    batchInterval = 5;

    System.out.println(generateBatches(batchTotal, batchInterval).toString());
    }

    public static List<String> generateBatches(int batchTotal, int batchInterval) {
    List<String> ranges = new ArrayList<String>();
    int n = batchTotal;
    int rangeStart = 0;
    while (n > 0) {
    ranges.add(rangeStart + "-" + ((rangeStart + batchInterval) > batchTotal ? batchTotal : rangeStart + batchInterval));
    rangeStart += batchInterval;
    n -= batchInterval;
    }
    return ranges;
    }

    }






    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Nov 14 '18 at 17:48









    Dakshinamurthy Karra

    4,12111021




    4,12111021












    • You have a point!! I made it very complex. Thanks for making it so simple.
      – wandermonk
      Nov 14 '18 at 18:13


















    • You have a point!! I made it very complex. Thanks for making it so simple.
      – wandermonk
      Nov 14 '18 at 18:13
















    You have a point!! I made it very complex. Thanks for making it so simple.
    – wandermonk
    Nov 14 '18 at 18:13




    You have a point!! I made it very complex. Thanks for making it so simple.
    – wandermonk
    Nov 14 '18 at 18:13













    0














    Take a look at Iterables in the guava library:



    public static <T> Iterable<List<T>> partition(Iterable<T> iterable, int size)



    You could use it like this:



    int outerLowerBound = 0;    
    int outerUpperBound = 605;
    int numberOfParts = 5;

    List<Integer> collect = IntStream.range(outerLowerBound, outerUpperBound)
    .boxed().collect(Collectors.toList());
    Iterable<List<Integer>> partitions = Iterables.partition(collect, numberOfParts);


    Inside the partitions list are your intervals. Then for each interval; 1st item is lower bound and last item is upper bound.



    for (List<Integer> partition : partitions) {
    System.out.println("[ " + Iterables.getFirst(partition, 0) + ", " + Iterables.getLast(partition) + " ]");
    }


    Output:



    [ 1, 5 ]
    [ 6, 10 ]
    [ 11, 15 ]
    [ 16, 20 ]
    [ 21, 25 ]
    [ 26, 30 ]
    [ 31, 35 ]
    ...
    [ 581, 585 ]
    [ 586, 590 ]
    [ 591, 595 ]
    [ 596, 600 ]
    [ 601, 604 ]


    See doc:



    https://google.github.io/guava/releases/21.0/api/docs/com/google/common/collect/Iterables.html#partition-java.lang.Iterable-int-






    share|improve this answer




























      0














      Take a look at Iterables in the guava library:



      public static <T> Iterable<List<T>> partition(Iterable<T> iterable, int size)



      You could use it like this:



      int outerLowerBound = 0;    
      int outerUpperBound = 605;
      int numberOfParts = 5;

      List<Integer> collect = IntStream.range(outerLowerBound, outerUpperBound)
      .boxed().collect(Collectors.toList());
      Iterable<List<Integer>> partitions = Iterables.partition(collect, numberOfParts);


      Inside the partitions list are your intervals. Then for each interval; 1st item is lower bound and last item is upper bound.



      for (List<Integer> partition : partitions) {
      System.out.println("[ " + Iterables.getFirst(partition, 0) + ", " + Iterables.getLast(partition) + " ]");
      }


      Output:



      [ 1, 5 ]
      [ 6, 10 ]
      [ 11, 15 ]
      [ 16, 20 ]
      [ 21, 25 ]
      [ 26, 30 ]
      [ 31, 35 ]
      ...
      [ 581, 585 ]
      [ 586, 590 ]
      [ 591, 595 ]
      [ 596, 600 ]
      [ 601, 604 ]


      See doc:



      https://google.github.io/guava/releases/21.0/api/docs/com/google/common/collect/Iterables.html#partition-java.lang.Iterable-int-






      share|improve this answer


























        0












        0








        0






        Take a look at Iterables in the guava library:



        public static <T> Iterable<List<T>> partition(Iterable<T> iterable, int size)



        You could use it like this:



        int outerLowerBound = 0;    
        int outerUpperBound = 605;
        int numberOfParts = 5;

        List<Integer> collect = IntStream.range(outerLowerBound, outerUpperBound)
        .boxed().collect(Collectors.toList());
        Iterable<List<Integer>> partitions = Iterables.partition(collect, numberOfParts);


        Inside the partitions list are your intervals. Then for each interval; 1st item is lower bound and last item is upper bound.



        for (List<Integer> partition : partitions) {
        System.out.println("[ " + Iterables.getFirst(partition, 0) + ", " + Iterables.getLast(partition) + " ]");
        }


        Output:



        [ 1, 5 ]
        [ 6, 10 ]
        [ 11, 15 ]
        [ 16, 20 ]
        [ 21, 25 ]
        [ 26, 30 ]
        [ 31, 35 ]
        ...
        [ 581, 585 ]
        [ 586, 590 ]
        [ 591, 595 ]
        [ 596, 600 ]
        [ 601, 604 ]


        See doc:



        https://google.github.io/guava/releases/21.0/api/docs/com/google/common/collect/Iterables.html#partition-java.lang.Iterable-int-






        share|improve this answer














        Take a look at Iterables in the guava library:



        public static <T> Iterable<List<T>> partition(Iterable<T> iterable, int size)



        You could use it like this:



        int outerLowerBound = 0;    
        int outerUpperBound = 605;
        int numberOfParts = 5;

        List<Integer> collect = IntStream.range(outerLowerBound, outerUpperBound)
        .boxed().collect(Collectors.toList());
        Iterable<List<Integer>> partitions = Iterables.partition(collect, numberOfParts);


        Inside the partitions list are your intervals. Then for each interval; 1st item is lower bound and last item is upper bound.



        for (List<Integer> partition : partitions) {
        System.out.println("[ " + Iterables.getFirst(partition, 0) + ", " + Iterables.getLast(partition) + " ]");
        }


        Output:



        [ 1, 5 ]
        [ 6, 10 ]
        [ 11, 15 ]
        [ 16, 20 ]
        [ 21, 25 ]
        [ 26, 30 ]
        [ 31, 35 ]
        ...
        [ 581, 585 ]
        [ 586, 590 ]
        [ 591, 595 ]
        [ 596, 600 ]
        [ 601, 604 ]


        See doc:



        https://google.github.io/guava/releases/21.0/api/docs/com/google/common/collect/Iterables.html#partition-java.lang.Iterable-int-







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Nov 14 '18 at 17:35

























        answered Nov 14 '18 at 15:38









        Rob

        410319




        410319






























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