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0

It looks to me like it's impossible to include Integer.MAX_VALUE and Long.MAX_VALUE as possible random values when you create an IntStream or LongStream using bounds with the java.util.Random class.

This seems like a kind of annoying oversight. I can understand why they were trying to be consistent with the .doubles() version, but it makes any attempt to get a stream of random ints or longs that could include the max value (but not the full range of values, obviously, since there are methods that do that) a lot more complicated than it needs to be.

Am I missing something or has this been discussed elsewhere?

java random java-stream

share|improve this question

asked Mar 9 at 2:43

TOBTOB

1,091923

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not really clear why do you believe that ... it's impossible to include Integer.MAX_VALUE? Or what do you mean by that, can you please add a block of code to clarify that.
  
  – Naman
  Mar 9 at 3:16
  
  

  
  
  
  

add a comment | 

0

It looks to me like it's impossible to include Integer.MAX_VALUE and Long.MAX_VALUE as possible random values when you create an IntStream or LongStream using bounds with the java.util.Random class.

This seems like a kind of annoying oversight. I can understand why they were trying to be consistent with the .doubles() version, but it makes any attempt to get a stream of random ints or longs that could include the max value (but not the full range of values, obviously, since there are methods that do that) a lot more complicated than it needs to be.

Am I missing something or has this been discussed elsewhere?

java random java-stream

share|improve this question

asked Mar 9 at 2:43

TOBTOB

1,091923

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not really clear why do you believe that ... it's impossible to include Integer.MAX_VALUE? Or what do you mean by that, can you please add a block of code to clarify that.
  
  – Naman
  Mar 9 at 3:16
  
  

  
  
  
  

add a comment | 

It looks to me like it's impossible to include Integer.MAX_VALUE and Long.MAX_VALUE as possible random values when you create an IntStream or LongStream using bounds with the java.util.Random class.

This seems like a kind of annoying oversight. I can understand why they were trying to be consistent with the .doubles() version, but it makes any attempt to get a stream of random ints or longs that could include the max value (but not the full range of values, obviously, since there are methods that do that) a lot more complicated than it needs to be.

Am I missing something or has this been discussed elsewhere?

java random java-stream

share|improve this question

asked Mar 9 at 2:43

TOBTOB

1,091923

share|improve this question

asked Mar 9 at 2:43

TOBTOB

1,091923

share|improve this question

asked Mar 9 at 2:43

TOBTOB

1,091923

asked Mar 9 at 2:43

TOBTOB

1,091923

asked Mar 9 at 2:43

TOBTOB

1,091923

1 Answer
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0

You are correct. The javadoc states that the upper bound is exclusive. That means that you cannot use ints(lower, upper) to get a stream that includes Integer.MAX_VALUE.

Rationale?

This is possibly an edge-case that the designers didn't consider to start with¹, or that they thought was not worth a "fix" that complicated the API.

Note that Random.nextInt(bound) has this same problem, so this shortcoming in Random has been present since Java 1.2. Therefore, another possibility is that the designers were aware of the shortcoming when they added the ints(...) and longs(...) methods, but decided not to address it because it would lead to an awkward inconsistency with the older methods.

^{1 - This is unlikely, IMO. The Java team were / are smart people. And it is clear from the source code that they are well aware of this now.}

---

Anyway ... if you need streams of random numbers with a range that includes the MAX_VALUEs, you can use the no-args overloads (ints() and longs()) and filter the streams. Alternatively, you could roll your own streams.

share|improve this answer

edited Mar 9 at 6:03

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The filter approach isn't too awful. Thanks!
  
  – TOB
  Mar 13 at 18:51
  

  
  
  
  

add a comment | 

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0

You are correct. The javadoc states that the upper bound is exclusive. That means that you cannot use ints(lower, upper) to get a stream that includes Integer.MAX_VALUE.

Rationale?

This is possibly an edge-case that the designers didn't consider to start with¹, or that they thought was not worth a "fix" that complicated the API.

Note that Random.nextInt(bound) has this same problem, so this shortcoming in Random has been present since Java 1.2. Therefore, another possibility is that the designers were aware of the shortcoming when they added the ints(...) and longs(...) methods, but decided not to address it because it would lead to an awkward inconsistency with the older methods.

^{1 - This is unlikely, IMO. The Java team were / are smart people. And it is clear from the source code that they are well aware of this now.}

---

Anyway ... if you need streams of random numbers with a range that includes the MAX_VALUEs, you can use the no-args overloads (ints() and longs()) and filter the streams. Alternatively, you could roll your own streams.

share|improve this answer

edited Mar 9 at 6:03

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The filter approach isn't too awful. Thanks!
  
  – TOB
  Mar 13 at 18:51
  

  
  
  
  

add a comment | 

0

You are correct. The javadoc states that the upper bound is exclusive. That means that you cannot use ints(lower, upper) to get a stream that includes Integer.MAX_VALUE.

Rationale?

This is possibly an edge-case that the designers didn't consider to start with¹, or that they thought was not worth a "fix" that complicated the API.

Note that Random.nextInt(bound) has this same problem, so this shortcoming in Random has been present since Java 1.2. Therefore, another possibility is that the designers were aware of the shortcoming when they added the ints(...) and longs(...) methods, but decided not to address it because it would lead to an awkward inconsistency with the older methods.

^{1 - This is unlikely, IMO. The Java team were / are smart people. And it is clear from the source code that they are well aware of this now.}

---

Anyway ... if you need streams of random numbers with a range that includes the MAX_VALUEs, you can use the no-args overloads (ints() and longs()) and filter the streams. Alternatively, you could roll your own streams.

share|improve this answer

edited Mar 9 at 6:03

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The filter approach isn't too awful. Thanks!
  
  – TOB
  Mar 13 at 18:51
  

  
  
  
  

add a comment | 

You are correct. The javadoc states that the upper bound is exclusive. That means that you cannot use ints(lower, upper) to get a stream that includes Integer.MAX_VALUE.

Rationale?

This is possibly an edge-case that the designers didn't consider to start with¹, or that they thought was not worth a "fix" that complicated the API.

Note that Random.nextInt(bound) has this same problem, so this shortcoming in Random has been present since Java 1.2. Therefore, another possibility is that the designers were aware of the shortcoming when they added the ints(...) and longs(...) methods, but decided not to address it because it would lead to an awkward inconsistency with the older methods.

^{1 - This is unlikely, IMO. The Java team were / are smart people. And it is clear from the source code that they are well aware of this now.}

---

Anyway ... if you need streams of random numbers with a range that includes the MAX_VALUEs, you can use the no-args overloads (ints() and longs()) and filter the streams. Alternatively, you could roll your own streams.

share|improve this answer

edited Mar 9 at 6:03

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944

share|improve this answer

edited Mar 9 at 6:03

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944

answered Mar 9 at 5:48

Stephen CStephen C

526k72586944