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Category: Interview Question

What is IdentityHashMap?

What is IdentityHashMap?

What is IdentityHashMap? In journal == operator meant for reference comparison (address comparison) and equals() method meant for content comparison. It is exactly same as HashMap(including methods and constructors) except the following difference. In the case of normal HashMap, JVM will use .equals() method to identify duplicates keys, which is meant for content . . . Read more

Difference between Comparator and Comparable in Java?

Difference between Comparator and Comparable in Java?

Difference between Comparator and Comparable in Java? Comparator[I] It is present in java.lang package and it contains only one method. [highlight]compareTo()[/highlight];   If we are depending on default natural sorting order then while adding the object into the TreeSet JVM will call compareTo() method.  If default natural sorting order not available or . . . Read more