What is the headMap() method of the NavigableMap interface?

The headMap() method of the NavigableMap interface returns all the key value pairs in a navigable map whose keys are less than the element given in the method parameter. There are two versions of the headMap() method as follows:

• SortedMap<E> headMap(E toKey): This method returns the elements of the navigable map that are strictly less than toKey.
• NavigableMap<E> headMap(E toKey, boolean inclusive): This method returns the elements of the navigable map whose elements are less than or equal to the toKey. The toKey is included only if the value of inclusive is true.

The toKey element must be compatible with the navigable map’s comparator. Also, it must implement the Comparable interface. It throws the NullPointerException if the toKey element is null and the given map does not permit null elements. It throws the IllegalArgumentException if the navigable map has a restricted range and toKey lies outside the bounds of the range.

• Best exam simulation SUN scbcd download free trial.
• Pass SCDJWS in first attampt.
• Pass SUN scjp - SCJP
• Pass SUN scjp-5-0 - SCJP 5/6
• Pass SCJP 6.0 in first attampt.
• Pass SCJP Upgrade in first attampt.

• Previous Entry: What is the lowerEntry(k) method of the NavigableMap interface?
• Next Entry: What is the tailMap() method of the NavigableMap interface?