- Java.util Package Classes
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- Java.util - Random
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- Java.util - SimpleTimeZone
- Java.util - Stack
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- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
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- Java.util - Discussion
Java TreeMap navigableKeySet() Method
Description
The Java TreeMap navigableKeySet() method is used to return a NavigableSet view of the keys contained in this map. The set's iterator returns the keys in ascending order. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa.
Declaration
Following is the declaration for java.util.TreeMap.navigableKeySet() method.
public NavigableSet<K> navigableKeySet()
Parameters
NA
Return Value
The method call returns a navigable set view of the keys in this map.
Exception
NA
Getting Navigable Set View from a TreeMap of Integer,Integer Pair Example
The following example shows the usage of Java TreeMap navigableKeySet() method to get a NavigableSet view of the keys of this map. We've created a TreeMap object of Integer,Integer pairs. Then few entries are added, and using navigableKeySet() we're printing a Navigable Set of keys of the map.
package com.tutorialspoint; import java.util.TreeMap; public class TreeMapDemo { public static void main(String[] args) { // creating tree map TreeMap<Integer, Integer> treemap = new TreeMap<>(); // populating tree map treemap.put(2, 2); treemap.put(1, 1); treemap.put(3, 3); treemap.put(6, 6); treemap.put(5, 5); // getting navigable key set System.out.println("Checking key set value"); System.out.println("Value is: "+ treemap.navigableKeySet()); } }
Output
Let us compile and run the above program, this will produce the following result.
Checking key set value Value is: [1, 2, 3, 5, 6]
Getting Navigable Set View from a TreeMap of Integer,String Pair Example
The following example shows the usage of Java TreeMap navigableKeySet() method to get a NavigableSet view of the keys of this map. We've created a TreeMap object of Integer,String pairs. Then few entries are added, and using navigableKeySet() we're printing a Navigable Set of keys of the map.
package com.tutorialspoint; import java.util.TreeMap; public class TreeMapDemo { public static void main(String[] args) { // creating tree map TreeMap<Integer, String> treemap = new TreeMap<>(); // populating tree map treemap.put(2, "two"); treemap.put(1, "one"); treemap.put(3, "three"); treemap.put(6, "six"); treemap.put(5, "five"); // getting navigable key set System.out.println("Checking key set value"); System.out.println("Value is: "+ treemap.navigableKeySet()); } }
Output
Let us compile and run the above program, this will produce the following result.
Checking key set value Value is: [1, 2, 3, 5, 6]
Getting Navigable Set View from a TreeMap of Integer,Object Pair Example
The following example shows the usage of Java TreeMap navigableKeySet() method to get a NavigableSet view of the keys of this map. We've created a TreeMap object of Integer,Student pairs. Then few entries are added, and using navigableKeySet() we're printing a Navigable Set of keys of the map.
package com.tutorialspoint; import java.util.TreeMap; public class TreeMapDemo { public static void main(String[] args) { // creating tree map TreeMap<Integer, Student> treemap = new TreeMap<>(); // populating tree map treemap.put(2, new Student(2, "Robert")); treemap.put(1, new Student(1, "Julie")); treemap.put(3, new Student(3, "Adam")); treemap.put(6, new Student(6, "Julia")); treemap.put(5, new Student(5, "Tom")); // getting navigable key set System.out.println("Checking key set value"); System.out.println("Value is: "+ treemap.navigableKeySet()); } } class Student { int rollNo; String name; Student(int rollNo, String name){ this.rollNo = rollNo; this.name = name; } @Override public String toString() { return "[ " + this.rollNo + ", " + this.name + " ]"; } @Override public boolean equals(Object obj) { if(obj == null) return false; Student s = (Student)obj; return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name); } }
Output
Let us compile and run the above program, this will produce the following result.
Checking key set value Value is: [1, 2, 3, 5, 6]
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