comparator Archives - 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 ...

April 8, 2022
0 Comments

Java error: Comparison method violates its general contract

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

April 6, 2022
0 Comments

Java Comparator class to sort arrays

[…] How should Java Comparator class be declared to sort the arrays by their first elements in decreasing order...

April 6, 2022
0 Comments

Java TreeMap Comparator

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, ...

April 4, 2022
0 Comments

Sort ArrayList of custom Objects by property

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, ...

April 4, 2022
0 Comments

Java get String CompareTo as a comparator object

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() ...

April 3, 2022
0 Comments