How to, from a list, filter it and convert to Map
I am trying to, from a list of Strings, filter it, and load the results into a Map<String,String> of with the strings that passed through the test and a generic reason.
This is why I am trying:
Map<String,String> invalidStrings = null;
invalidStrings = src.getAllSubjects()
.stream()
.filter(name -> !(name.contains("-value") || name.contains("-key")))
.collect(Collectors.toMap(Function.identity(), "Some Reason"));
This is what I am getting:
The method toMap(Function, Function) in the type Collectors is not applicable for the arguments
(Function, String)
No idea why I am not being able to do this... Everywhere I search the suggestions are basically the same as I am doing.
java lambda filter java-stream collectors
asked Dec 27 '18 at 16:33
LeYAUable
175
add a comment |
I am trying to, from a list of Strings, filter it, and load the results into a Map<String,String> of with the strings that passed through the test and a generic reason.
This is why I am trying:
Map<String,String> invalidStrings = null;
invalidStrings = src.getAllSubjects()
.stream()
.filter(name -> !(name.contains("-value") || name.contains("-key")))
.collect(Collectors.toMap(Function.identity(), "Some Reason"));
This is what I am getting:
The method toMap(Function, Function) in the type Collectors is not applicable for the arguments
(Function, String)
No idea why I am not being able to do this... Everywhere I search the suggestions are basically the same as I am doing.
java lambda filter java-stream collectors
asked Dec 27 '18 at 16:33
LeYAUable
175
3
invalidStrings = invalidSchemas = src.getAllSubjects()what's this ? and what made you think of applying a string when for a similar argument you've applied aFunction.identity()?
– nullpointer
Dec 27 '18 at 16:35
That was a typo... will correct
– LeYAUable
Dec 27 '18 at 21:55
add a comment |
I am trying to, from a list of Strings, filter it, and load the results into a Map<String,String> of with the strings that passed through the test and a generic reason.
This is why I am trying:
Map<String,String> invalidStrings = null;
invalidStrings = src.getAllSubjects()
.stream()
.filter(name -> !(name.contains("-value") || name.contains("-key")))
.collect(Collectors.toMap(Function.identity(), "Some Reason"));
This is what I am getting:
The method toMap(Function, Function) in the type Collectors is not applicable for the arguments
(Function, String)
No idea why I am not being able to do this... Everywhere I search the suggestions are basically the same as I am doing.
java lambda filter java-stream collectors
asked Dec 27 '18 at 16:33
LeYAUable
175
I am trying to, from a list of Strings, filter it, and load the results into a Map<String,String> of with the strings that passed through the test and a generic reason.
This is why I am trying:
Map<String,String> invalidStrings = null;
invalidStrings = src.getAllSubjects()
.stream()
.filter(name -> !(name.contains("-value") || name.contains("-key")))
.collect(Collectors.toMap(Function.identity(), "Some Reason"));
This is what I am getting:
The method toMap(Function, Function) in the type Collectors is not applicable for the arguments
(Function, String)
No idea why I am not being able to do this... Everywhere I search the suggestions are basically the same as I am doing.
java lambda filter java-stream collectors
java lambda filter java-stream collectors
asked Dec 27 '18 at 16:33
LeYAUable
175
asked Dec 27 '18 at 16:33
LeYAUable
175
edited Dec 27 '18 at 21:55
asked Dec 27 '18 at 16:33
LeYAUable
175
asked Dec 27 '18 at 16:33
LeYAUable
175
asked Dec 27 '18 at 16:33
LeYAUable
175
175
3
invalidStrings = invalidSchemas = src.getAllSubjects()what's this ? and what made you think of applying a string when for a similar argument you've applied aFunction.identity()?
– nullpointer
Dec 27 '18 at 16:35
That was a typo... will correct
– LeYAUable
Dec 27 '18 at 21:55
add a comment |
3
invalidStrings = invalidSchemas = src.getAllSubjects()what's this ? and what made you think of applying a string when for a similar argument you've applied aFunction.identity()?
– nullpointer
Dec 27 '18 at 16:35
That was a typo... will correct
– LeYAUable
Dec 27 '18 at 21:55
3
3
invalidStrings = invalidSchemas = src.getAllSubjects() what's this ? and what made you think of applying a string when for a similar argument you've applied a Function.identity() ?– nullpointer
Dec 27 '18 at 16:35
invalidStrings = invalidSchemas = src.getAllSubjects() what's this ? and what made you think of applying a string when for a similar argument you've applied a Function.identity() ?– nullpointer
Dec 27 '18 at 16:35
That was a typo... will correct
– LeYAUable
Dec 27 '18 at 21:55
That was a typo... will correct
– LeYAUable
Dec 27 '18 at 21:55
add a comment |
1 Answer
1
active
oldest
votes
This is the important part of the error:
The method toMap(Function, Function) <--- note the
Function, Function
This means, toMap expects the first argument to be a function which you've done correctly via Function.identity() i.e. v -> v but the second value you've passed is a String
Rather the value mapper must be a function:
.collect(Collectors.toMap(Function.identity(), v -> "Some Reason"));
note the v -> "Some Reason";
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
1
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
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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This is the important part of the error:
The method toMap(Function, Function) <--- note the
Function, Function
This means, toMap expects the first argument to be a function which you've done correctly via Function.identity() i.e. v -> v but the second value you've passed is a String
Rather the value mapper must be a function:
.collect(Collectors.toMap(Function.identity(), v -> "Some Reason"));
note the v -> "Some Reason";
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
1
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
add a comment |
This is the important part of the error:
The method toMap(Function, Function) <--- note the
Function, Function
This means, toMap expects the first argument to be a function which you've done correctly via Function.identity() i.e. v -> v but the second value you've passed is a String
Rather the value mapper must be a function:
.collect(Collectors.toMap(Function.identity(), v -> "Some Reason"));
note the v -> "Some Reason";
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
1
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
add a comment |
This is the important part of the error:
The method toMap(Function, Function) <--- note the
Function, Function
This means, toMap expects the first argument to be a function which you've done correctly via Function.identity() i.e. v -> v but the second value you've passed is a String
Rather the value mapper must be a function:
.collect(Collectors.toMap(Function.identity(), v -> "Some Reason"));
note the v -> "Some Reason";
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
This is the important part of the error:
The method toMap(Function, Function) <--- note the
Function, Function
This means, toMap expects the first argument to be a function which you've done correctly via Function.identity() i.e. v -> v but the second value you've passed is a String
Rather the value mapper must be a function:
.collect(Collectors.toMap(Function.identity(), v -> "Some Reason"));
note the v -> "Some Reason";
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
answered Dec 27 '18 at 16:34
Aomine
39.7k73770
39.7k73770
1
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
add a comment |
1
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
1
1
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
Thanks for your help, this worked!
– LeYAUable
Dec 28 '18 at 10:20
add a comment |
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invalidStrings = invalidSchemas = src.getAllSubjects()what's this ? and what made you think of applying a string when for a similar argument you've applied aFunction.identity()?– nullpointer
Dec 27 '18 at 16:35
That was a typo... will correct
– LeYAUable
Dec 27 '18 at 21:55