TreeMap K firstKey() method in java

Let’s learn TreeMap K firstKey() method in java. TreeMap K firstKey() method in java firstKey() method of TreeMap class returns the first (lowest) key currently in this map. Syntax: public K firstKey() Throws: NoSuchElementException – if this map is empty. Now let’s see example on TreeMap K firstKey() method. import java.util.TreeMap; public class TreeMapFirstKeyMethodExample {…

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