treemap « comparator « Java Collection Q&A

1. Java: SortedMap, TreeMap, Comparable? How to use?    stackoverflow.com

I have a list of objects I need to sort according to properties of one of their fields. I've heard that SortedMap and Comparators are the best way to do this.

1. Do ...

2. Java TreeMap (comparator) and get method ignoring the comparator    stackoverflow.com

public final Comparator<String> ID_IGN_CASE_COMP = new Comparator<String>() {

        public int compare(String s1, String s2) {
          ...

3. TreeMap only allowing one item to be put into it?    stackoverflow.com

I'm developing a Java application and am new to using TreeMap. The program needs to keep track of the number of occurrences of each word in a text file. However, I'm ...

4. Create a SortedMap in Java with a custom Comparator    stackoverflow.com

I want to create a TreeMap in Java with a custom sort order. The sorted keys which are string need to be sorted according to the second character. The values are ...

5. How to instantiate a Comparator inside of a Constructor    stackoverflow.com

I have never seen a comparator created inside of a constructor for a TreeMap structure. How would one go about doing this? Is there a way to make the ...

6. How can I use a Java ConcurrentNavigableMap with comparator instead of a TreeMap?    stackoverflow.com

I need build Queue that will stay allways sorted by its keys . the TreeMap seams to be great for it like in this example : http://www.javaexamples4u.com/2009/03/treemap-comparator.html but the big problem ...

7. Why will TreeMap(Comparator) not compile?    coderanch.com

8. TreeMap Comparator    forums.oracle.com

Output of Keys: Key: 1. Key: 1.1. Key: 1.2. Key: 1.3. Key: 1.4. Key: 10. Key: 10.1. Key: 10.1.1. Key: 10.2. Key: 10.3. Key: 11. Key: 12. Key: 12.1. Key: 12.2. Key: 13. Key: 13.1. Key: 14. Key: 14.1. Key: 14.2. Key: 14.3. Key: 15. Key: 15.1. Key: 15.2. Key: 15.3. Key: 2. Key: 2.1. Key: 2.2.