Canot interfer type: TreeSet with lambda Comparator
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I have tried a few things and i don't understand why it is not working.
I'm creating a SortedSet and like to use a TreeSet as the implementation with an lambda expression comparator:
SortedSet<int> all = new TreeSet<>(
(int a, int b) -> return (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0];
);
SortedSet<int> all = new TreeSet<>(
(a, b) -> (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0]
);
Whatever version i tried, it just doesn't work and i don't understand why it doesn't.
If a int is allowed, it should be able to understand what the type is, right?
java arrays int
asked Nov 11 at 12:22
sigi
8910
add a comment |
up vote
0
down vote
favorite
I have tried a few things and i don't understand why it is not working.
I'm creating a SortedSet and like to use a TreeSet as the implementation with an lambda expression comparator:
SortedSet<int> all = new TreeSet<>(
(int a, int b) -> return (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0];
);
SortedSet<int> all = new TreeSet<>(
(a, b) -> (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0]
);
Whatever version i tried, it just doesn't work and i don't understand why it doesn't.
If a int is allowed, it should be able to understand what the type is, right?
java arrays int
asked Nov 11 at 12:22
sigi
8910
2
A Comparator's compare method is supposed to return an integer. Your lambda returns a boolean.
– JB Nizet
Nov 11 at 12:24
Tx! Looked at it way too long already :-)
– sigi
Nov 11 at 12:30
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have tried a few things and i don't understand why it is not working.
I'm creating a SortedSet and like to use a TreeSet as the implementation with an lambda expression comparator:
SortedSet<int> all = new TreeSet<>(
(int a, int b) -> return (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0];
);
SortedSet<int> all = new TreeSet<>(
(a, b) -> (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0]
);
Whatever version i tried, it just doesn't work and i don't understand why it doesn't.
If a int is allowed, it should be able to understand what the type is, right?
java arrays int
asked Nov 11 at 12:22
sigi
8910
I have tried a few things and i don't understand why it is not working.
I'm creating a SortedSet and like to use a TreeSet as the implementation with an lambda expression comparator:
SortedSet<int> all = new TreeSet<>(
(int a, int b) -> return (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0];
);
SortedSet<int> all = new TreeSet<>(
(a, b) -> (a[0] == b[0]) ? a[1] >= b[1] : a[0] >= b[0]
);
Whatever version i tried, it just doesn't work and i don't understand why it doesn't.
If a int is allowed, it should be able to understand what the type is, right?
java arrays int
java arrays int
asked Nov 11 at 12:22
sigi
8910
asked Nov 11 at 12:22
sigi
8910
asked Nov 11 at 12:22
sigi
8910
asked Nov 11 at 12:22
sigi
8910
asked Nov 11 at 12:22
sigi
8910
8910
2
A Comparator's compare method is supposed to return an integer. Your lambda returns a boolean.
– JB Nizet
Nov 11 at 12:24
Tx! Looked at it way too long already :-)
– sigi
Nov 11 at 12:30
add a comment |
2
A Comparator's compare method is supposed to return an integer. Your lambda returns a boolean.
– JB Nizet
Nov 11 at 12:24
Tx! Looked at it way too long already :-)
– sigi
Nov 11 at 12:30
2
2
A Comparator's compare method is supposed to return an integer. Your lambda returns a boolean.
– JB Nizet
Nov 11 at 12:24
A Comparator's compare method is supposed to return an integer. Your lambda returns a boolean.
– JB Nizet
Nov 11 at 12:24
Tx! Looked at it way too long already :-)
– sigi
Nov 11 at 12:30
Tx! Looked at it way too long already :-)
– sigi
Nov 11 at 12:30
add a comment |
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2
A Comparator's compare method is supposed to return an integer. Your lambda returns a boolean.
– JB Nizet
Nov 11 at 12:24
Tx! Looked at it way too long already :-)
– sigi
Nov 11 at 12:30