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comparator

How to use Comparator in Java to sort

by IT Nursery

I learned how to use the comparable but I’m having difficulty with the Comparator. I am having a error in my code: Exception … Read more

Tags comparator, java, sorting

“Comparison method violates its general contract!”

by IT Nursery

Can someone explain me in simple terms, why does this code throw an exception, “Comparison method violates its general contract!”, and how do … Read more

Tags comparator, java

Java : Comparable vs Comparator [duplicate]

by IT Nursery

When your class implements Comparable, the compareTo method of the class is defining the “natural” ordering of that object. That method is contractually obligated (though not … Read more

Tags comparable, comparator, java

Java error: Comparison method violates its general contract

by IT Nursery

The exception message is actually pretty descriptive. The contract it mentions is transitivity: if A > B and B > C then for … Read more

Tags comparator, compare, java, java-7, migration

Java Comparator class to sort arrays

by IT Nursery

[…] How should Java Comparator class be declared to sort the arrays by their first elements in decreasing order […] Here’s a complete … Read more

Tags arrays, comparator, java, multidimensional-array

Java TreeMap Comparator

by IT Nursery

You can not sort TreeMap on values. A Red-Black tree based NavigableMap implementation. The map is sorted according to the natural ordering of its keys, … Read more

Tags comparator, java, sortedmap, treemap

Sort ArrayList of custom Objects by property

by IT Nursery

Since Date implements Comparable, it has a compareTo method just like String does. So your custom Comparator could look like this: public class CustomComparator implements Comparator<MyObject> { @Override public int compare(MyObject o1, … Read more

Tags comparator, date, java, sorting

Java get String CompareTo as a comparator object

by IT Nursery

The Arrays class has versions of sort() and binarySearch() which don’t require a Comparator. For example, you can use the version of Arrays.sort() … Read more

Tags comparator, java, object, string

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