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Java collections sort method for string is not working properly for case sensitive and special characters
2019 Community Moderator ElectionFastest way to determine if an integer's square root is an integerSorted collection in JavaCan I have someone verify my collections for the SCJP ExamClone a single tone objectMethod override returns nullOverriding private methods in (non-)static classesJava - Method executed prior to Default ConstructorWhen use java regular-expression pattern.matcher(), source does not match regex.But, my hope result is ,source matches regexJava collections not sorting complete stringString sort on basis of length and then on basis of case
16
I was working on sorting a list of String in Java (1.8) and came to know that it is not working as expected!
I am trying the following code for sorting:
private Set<String> getTestData()
Set<String> compRoles = new HashSet<>();
compRoles.add("AA");
compRoles.add("Aa");
compRoles.add("aA");
compRoles.add("aa");
compRoles.add("11");
compRoles.add("117");
compRoles.add("12");
compRoles.add("21");
compRoles.add("!@");
compRoles.add("@!");
compRoles.add("@@!");
compRoles.add("BB");
compRoles.add("Bb");
compRoles.add("bb");
return compRoles;
public static void main(String args[])
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
Collections.sort(test);
System.out.println(test);
Before sort: [AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
After sort: [!@, 11, 117, 12, 21, @!, @@!, AA, Aa, BB, Bb, aA, aa, bb]
My expectation is: [!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
Do I need to use something else other that natural sort for this?
java sorting collections
edited 3 hours ago
Peter Mortensen
13.8k1987113
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
add a comment |
16
I was working on sorting a list of String in Java (1.8) and came to know that it is not working as expected!
I am trying the following code for sorting:
private Set<String> getTestData()
Set<String> compRoles = new HashSet<>();
compRoles.add("AA");
compRoles.add("Aa");
compRoles.add("aA");
compRoles.add("aa");
compRoles.add("11");
compRoles.add("117");
compRoles.add("12");
compRoles.add("21");
compRoles.add("!@");
compRoles.add("@!");
compRoles.add("@@!");
compRoles.add("BB");
compRoles.add("Bb");
compRoles.add("bb");
return compRoles;
public static void main(String args[])
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
Collections.sort(test);
System.out.println(test);
Before sort: [AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
After sort: [!@, 11, 117, 12, 21, @!, @@!, AA, Aa, BB, Bb, aA, aa, bb]
My expectation is: [!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
Do I need to use something else other that natural sort for this?
java sorting collections
edited 3 hours ago
Peter Mortensen
13.8k1987113
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
12
so, for you 'a' comes before 'A' .. ok. well, you'll need to write your own sorting logic, but it 'll be pretty broad. you'll actually have to compare char by char. good luck.
– Stultuske
12 hours ago
7
The answer is in the question. Given that the natural ordering doesn't order elements as you would like to, you need something else.
– JB Nizet
12 hours ago
This is already implemented in jQuery sort. datatables.net/examples/styling/bootstrap4 But I don't the the algo they are using! Because of this UI and back-end is not in sync. Any idea on this?
– Prabal Srivastava
12 hours ago
1
The unicode of ! is smaller than that of @ , unicode of @ is small than 1, unicode of 1 is smaller than A, uncicode of A is smaller than a. Hope it answers for the output that you get. Now If you need sorting as per your ordering , implement your comparator.
– nits.kk
11 hours ago
@nits.kk: I am totally agree with the answer given by jaspreet. We can solve this issue by using docs.oracle.com/javase/7/docs/api/java/text/Collator.html
– Prabal Srivastava
10 hours ago
add a comment |
16
16
16
4
I was working on sorting a list of String in Java (1.8) and came to know that it is not working as expected!
I am trying the following code for sorting:
private Set<String> getTestData()
Set<String> compRoles = new HashSet<>();
compRoles.add("AA");
compRoles.add("Aa");
compRoles.add("aA");
compRoles.add("aa");
compRoles.add("11");
compRoles.add("117");
compRoles.add("12");
compRoles.add("21");
compRoles.add("!@");
compRoles.add("@!");
compRoles.add("@@!");
compRoles.add("BB");
compRoles.add("Bb");
compRoles.add("bb");
return compRoles;
public static void main(String args[])
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
Collections.sort(test);
System.out.println(test);
Before sort: [AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
After sort: [!@, 11, 117, 12, 21, @!, @@!, AA, Aa, BB, Bb, aA, aa, bb]
My expectation is: [!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
Do I need to use something else other that natural sort for this?
java sorting collections
edited 3 hours ago
Peter Mortensen
13.8k1987113
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
I was working on sorting a list of String in Java (1.8) and came to know that it is not working as expected!
I am trying the following code for sorting:
private Set<String> getTestData()
Set<String> compRoles = new HashSet<>();
compRoles.add("AA");
compRoles.add("Aa");
compRoles.add("aA");
compRoles.add("aa");
compRoles.add("11");
compRoles.add("117");
compRoles.add("12");
compRoles.add("21");
compRoles.add("!@");
compRoles.add("@!");
compRoles.add("@@!");
compRoles.add("BB");
compRoles.add("Bb");
compRoles.add("bb");
return compRoles;
public static void main(String args[])
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
Collections.sort(test);
System.out.println(test);
Before sort: [AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
After sort: [!@, 11, 117, 12, 21, @!, @@!, AA, Aa, BB, Bb, aA, aa, bb]
My expectation is: [!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
Do I need to use something else other that natural sort for this?
java sorting collections
java sorting collections
edited 3 hours ago
Peter Mortensen
13.8k1987113
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
edited 3 hours ago
Peter Mortensen
13.8k1987113
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
edited 3 hours ago
Peter Mortensen
13.8k1987113
edited 3 hours ago
Peter Mortensen
13.8k1987113
edited 3 hours ago
Peter Mortensen
13.8k1987113
13.8k1987113
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
asked 12 hours ago
Prabal SrivastavaPrabal Srivastava
15319
15319
12
so, for you 'a' comes before 'A' .. ok. well, you'll need to write your own sorting logic, but it 'll be pretty broad. you'll actually have to compare char by char. good luck.
– Stultuske
12 hours ago
7
The answer is in the question. Given that the natural ordering doesn't order elements as you would like to, you need something else.
– JB Nizet
12 hours ago
This is already implemented in jQuery sort. datatables.net/examples/styling/bootstrap4 But I don't the the algo they are using! Because of this UI and back-end is not in sync. Any idea on this?
– Prabal Srivastava
12 hours ago
1
The unicode of ! is smaller than that of @ , unicode of @ is small than 1, unicode of 1 is smaller than A, uncicode of A is smaller than a. Hope it answers for the output that you get. Now If you need sorting as per your ordering , implement your comparator.
– nits.kk
11 hours ago
@nits.kk: I am totally agree with the answer given by jaspreet. We can solve this issue by using docs.oracle.com/javase/7/docs/api/java/text/Collator.html
– Prabal Srivastava
10 hours ago
add a comment |
12
so, for you 'a' comes before 'A' .. ok. well, you'll need to write your own sorting logic, but it 'll be pretty broad. you'll actually have to compare char by char. good luck.
– Stultuske
12 hours ago
7
The answer is in the question. Given that the natural ordering doesn't order elements as you would like to, you need something else.
– JB Nizet
12 hours ago
This is already implemented in jQuery sort. datatables.net/examples/styling/bootstrap4 But I don't the the algo they are using! Because of this UI and back-end is not in sync. Any idea on this?
– Prabal Srivastava
12 hours ago
1
The unicode of ! is smaller than that of @ , unicode of @ is small than 1, unicode of 1 is smaller than A, uncicode of A is smaller than a. Hope it answers for the output that you get. Now If you need sorting as per your ordering , implement your comparator.
– nits.kk
11 hours ago
@nits.kk: I am totally agree with the answer given by jaspreet. We can solve this issue by using docs.oracle.com/javase/7/docs/api/java/text/Collator.html
– Prabal Srivastava
10 hours ago
12
12
so, for you 'a' comes before 'A' .. ok. well, you'll need to write your own sorting logic, but it 'll be pretty broad. you'll actually have to compare char by char. good luck.
– Stultuske
12 hours ago
so, for you 'a' comes before 'A' .. ok. well, you'll need to write your own sorting logic, but it 'll be pretty broad. you'll actually have to compare char by char. good luck.
– Stultuske
12 hours ago
7
7
The answer is in the question. Given that the natural ordering doesn't order elements as you would like to, you need something else.
– JB Nizet
12 hours ago
The answer is in the question. Given that the natural ordering doesn't order elements as you would like to, you need something else.
– JB Nizet
12 hours ago
This is already implemented in jQuery sort. datatables.net/examples/styling/bootstrap4 But I don't the the algo they are using! Because of this UI and back-end is not in sync. Any idea on this?
– Prabal Srivastava
12 hours ago
This is already implemented in jQuery sort. datatables.net/examples/styling/bootstrap4 But I don't the the algo they are using! Because of this UI and back-end is not in sync. Any idea on this?
– Prabal Srivastava
12 hours ago
1
1
The unicode of ! is smaller than that of @ , unicode of @ is small than 1, unicode of 1 is smaller than A, uncicode of A is smaller than a. Hope it answers for the output that you get. Now If you need sorting as per your ordering , implement your comparator.
– nits.kk
11 hours ago
The unicode of ! is smaller than that of @ , unicode of @ is small than 1, unicode of 1 is smaller than A, uncicode of A is smaller than a. Hope it answers for the output that you get. Now If you need sorting as per your ordering , implement your comparator.
– nits.kk
11 hours ago
@nits.kk: I am totally agree with the answer given by jaspreet. We can solve this issue by using docs.oracle.com/javase/7/docs/api/java/text/Collator.html
– Prabal Srivastava
10 hours ago
@nits.kk: I am totally agree with the answer given by jaspreet. We can solve this issue by using docs.oracle.com/javase/7/docs/api/java/text/Collator.html
– Prabal Srivastava
10 hours ago
add a comment |
2 Answers
2
active
oldest
votes
28
You can use the Collator class of Java.
public static void main(String[] args)
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
test.sort(Collator.getInstance(Locale.ENGLISH));
System.out.println(test);
Output:-
[AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
[!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
answered 12 hours ago
jaspreetjaspreet
774421
1
Thanks alot (y)
– Prabal Srivastava
11 hours ago
2
Now days theListclass has its ownsortmethod, so going through is an unnecessary step. It is a little bit clearer to write the code like this:list.sort(Collator.getInstance(Locale.ENGLISH));.
– Lii
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
1
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:var test = new ArrayList<>(new Test().getTestData());
– Lii
7 hours ago
add a comment |
3
You could create a custom comparator for your sorting logics. After this you can use it like this:
Collections.sort(yourArrayList, new YourComparator());
answered 12 hours ago
ipaveipave
1889
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
1
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
28
You can use the Collator class of Java.
public static void main(String[] args)
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
test.sort(Collator.getInstance(Locale.ENGLISH));
System.out.println(test);
Output:-
[AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
[!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
answered 12 hours ago
jaspreetjaspreet
774421
1
Thanks alot (y)
– Prabal Srivastava
11 hours ago
2
Now days theListclass has its ownsortmethod, so going through is an unnecessary step. It is a little bit clearer to write the code like this:list.sort(Collator.getInstance(Locale.ENGLISH));.
– Lii
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
1
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:var test = new ArrayList<>(new Test().getTestData());
– Lii
7 hours ago
add a comment |
28
You can use the Collator class of Java.
public static void main(String[] args)
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
test.sort(Collator.getInstance(Locale.ENGLISH));
System.out.println(test);
Output:-
[AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
[!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
answered 12 hours ago
jaspreetjaspreet
774421
1
Thanks alot (y)
– Prabal Srivastava
11 hours ago
2
Now days theListclass has its ownsortmethod, so going through is an unnecessary step. It is a little bit clearer to write the code like this:list.sort(Collator.getInstance(Locale.ENGLISH));.
– Lii
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
1
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:var test = new ArrayList<>(new Test().getTestData());
– Lii
7 hours ago
add a comment |
28
28
28
You can use the Collator class of Java.
public static void main(String[] args)
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
test.sort(Collator.getInstance(Locale.ENGLISH));
System.out.println(test);
Output:-
[AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
[!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
answered 12 hours ago
jaspreetjaspreet
774421
You can use the Collator class of Java.
public static void main(String[] args)
List<String> test = new ArrayList<>(new Test().getTestData());
System.out.println(test);
test.sort(Collator.getInstance(Locale.ENGLISH));
System.out.println(test);
Output:-
[AA, Aa, aA, aa, 11, BB, Bb, bb, 12, @!, @@!, 117, 21, !@]
[!@, @!, @@!, 11, 117, 12, 21, aa, aA, Aa, AA, bb, Bb, BB]
answered 12 hours ago
jaspreetjaspreet
774421
edited 8 hours ago
answered 12 hours ago
jaspreetjaspreet
774421
answered 12 hours ago
jaspreetjaspreet
774421
answered 12 hours ago
jaspreetjaspreet
774421
774421
1
Thanks alot (y)
– Prabal Srivastava
11 hours ago
2
Now days theListclass has its ownsortmethod, so going through is an unnecessary step. It is a little bit clearer to write the code like this:list.sort(Collator.getInstance(Locale.ENGLISH));.
– Lii
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
1
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:var test = new ArrayList<>(new Test().getTestData());
– Lii
7 hours ago
add a comment |
1
Thanks alot (y)
– Prabal Srivastava
11 hours ago
2
Now days theListclass has its ownsortmethod, so going through is an unnecessary step. It is a little bit clearer to write the code like this:list.sort(Collator.getInstance(Locale.ENGLISH));.
– Lii
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
1
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:var test = new ArrayList<>(new Test().getTestData());
– Lii
7 hours ago
1
1
Thanks alot (y)
– Prabal Srivastava
11 hours ago
Thanks alot (y)
– Prabal Srivastava
11 hours ago
2
2
Now days the
List class has its own sort method, so going through is an unnecessary step. It is a little bit clearer to write the code like this: list.sort(Collator.getInstance(Locale.ENGLISH));.– Lii
8 hours ago
Now days the
List class has its own sort method, so going through is an unnecessary step. It is a little bit clearer to write the code like this: list.sort(Collator.getInstance(Locale.ENGLISH));.– Lii
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
Thanks @Lii . Updated the answer. I didn't read he was working in Java 8 so answered Collections.sort instead of list.sort
– jaspreet
8 hours ago
1
1
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:
var test = new ArrayList<>(new Test().getTestData());– Lii
7 hours ago
It not always clear what Java version to target in our answers. But Java 8 has been out almost 5 years now! I think we can safely assume that that is the standard. Now days you can even declare your list like this:
var test = new ArrayList<>(new Test().getTestData());– Lii
7 hours ago
add a comment |
3
You could create a custom comparator for your sorting logics. After this you can use it like this:
Collections.sort(yourArrayList, new YourComparator());
answered 12 hours ago
ipaveipave
1889
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
1
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
add a comment |
3
You could create a custom comparator for your sorting logics. After this you can use it like this:
Collections.sort(yourArrayList, new YourComparator());
answered 12 hours ago
ipaveipave
1889
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
1
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
add a comment |
3
3
3
You could create a custom comparator for your sorting logics. After this you can use it like this:
Collections.sort(yourArrayList, new YourComparator());
answered 12 hours ago
ipaveipave
1889
You could create a custom comparator for your sorting logics. After this you can use it like this:
Collections.sort(yourArrayList, new YourComparator());
answered 12 hours ago
ipaveipave
1889
answered 12 hours ago
ipaveipave
1889
answered 12 hours ago
ipaveipave
1889
answered 12 hours ago
ipaveipave
1889
1889
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
1
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
add a comment |
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
1
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
Appropriate your answer. I know the use of comparator and comparable. I am looking for the logic or algorithm used behind this.
– Prabal Srivastava
12 hours ago
1
1
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
Then you question should look like you need a custom comparator, and should contain question about sorting algortims. The easiest way is to have weights for each letter and compare them in your way.
– ipave
12 hours ago
add a comment |
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12
so, for you 'a' comes before 'A' .. ok. well, you'll need to write your own sorting logic, but it 'll be pretty broad. you'll actually have to compare char by char. good luck.
– Stultuske
12 hours ago
7
The answer is in the question. Given that the natural ordering doesn't order elements as you would like to, you need something else.
– JB Nizet
12 hours ago
This is already implemented in jQuery sort. datatables.net/examples/styling/bootstrap4 But I don't the the algo they are using! Because of this UI and back-end is not in sync. Any idea on this?
– Prabal Srivastava
12 hours ago
1
The unicode of ! is smaller than that of @ , unicode of @ is small than 1, unicode of 1 is smaller than A, uncicode of A is smaller than a. Hope it answers for the output that you get. Now If you need sorting as per your ordering , implement your comparator.
– nits.kk
11 hours ago
@nits.kk: I am totally agree with the answer given by jaspreet. We can solve this issue by using docs.oracle.com/javase/7/docs/api/java/text/Collator.html
– Prabal Srivastava
10 hours ago