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Java Collections unmodifiableNavigableMap() Method
Description
The Java Collections unmodifiableNavigableMap() method is used to return an unmodifiable view of the specified navigable map.
Declaration
Following is the declaration for java.util.Collections.unmodifiableNavigableMap() method.
public static <K,V> NavigableMap<K,V> unmodifiableNavigableMap(NavigableMap<? extends K,? extends V> m)
Parameters
m − This is the navigable map for which an unmodifiable view is to be returned.
Return Value
The method call returns an unmodifiable view of the specified navigable map.
Exception
NA
Getting Immutable NavigableMap From a Mutable NavigableMap of String, Integer Example
The following example shows the usage of Java Collection unmodifiableNavigableMap(NavigableMap) method. We've created a NavigableMap object of String and Integer. Few entries are added and then using unmodifiableNavigableMap(NavigableMap) method, we've retrieved the navigable version of navigable map and printed the navigable map.
package com.tutorialspoint; import java.util.Collections; import java.util.TreeMap; import java.util.NavigableMap; public class CollectionsDemo { public static void main(String[] args) { // create map NavigableMap<String,Integer> map = new TreeMap<String,Integer>(); // populate the map map.put("1",1); map.put("2",2); map.put("3",3); // create a navigable map NavigableMap<String,Integer> navigableMap = Collections.unmodifiableNavigableMap(map); System.out.println("Immutable Navigable map is :"+navigableMap); } }
Output
Let us compile and run the above program, this will produce the following result.
Immutable Navigable map is :{1=1, 2=2, 3=3}
Getting Immutable NavigableMap From a Mutable NavigableMap of String, String Example
The following example shows the usage of Java Collection unmodifiableNavigableMap(NavigableMap) method. We've created a NavigableMap object of String and String. Few entries are added and then using unmodifiableNavigableMap(NavigableMap) method, we've retrieved the navigable version of navigable map and printed the navigable map.
package com.tutorialspoint; import java.util.Collections; import java.util.TreeMap; import java.util.NavigableMap; public class CollectionsDemo { public static void main(String[] args) { // create map NavigableMap<String,String> map = new TreeMap<String,String>(); // populate the map map.put("1","TP"); map.put("2","IS"); map.put("3","BEST"); // create a navigable map NavigableMap<String,String> navigableMap = Collections.unmodifiableNavigableMap(map); System.out.println("Immutable Navigable map is :"+navigableMap); } }
Output
Let us compile and run the above program, this will produce the following result.
Immutable Navigable map is :{1=TP, 2=IS, 3=BEST}
Getting Immutable NavigableMap From a Mutable NavigableMap of String, Object Example
The following example shows the usage of Java Collection unmodifiableNavigableMap(NavigableMap) method. We've created a NavigableMap object of String and Student object. Few entries are added and then using unmodifiableNavigableMap(NavigableMap) method, we've retrieved the navigable version of navigable map and printed the navigable map.
package com.tutorialspoint; import java.util.Collections; import java.util.TreeMap; import java.util.NavigableMap; public class CollectionsDemo { public static void main(String[] args) { // create map NavigableMap<String,Student> map = new TreeMap<String,Student>(); // populate the map map.put("1",new Student(1, "Julie")); map.put("2",new Student(2, "Robert")); map.put("3",new Student(3, "Adam")); // create a navigable map NavigableMap<String,Student> navigableMap = Collections.unmodifiableNavigableMap(map); System.out.println("Immutable Navigable map is :"+navigableMap); } } 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 + " ]"; } }
Output
Let us compile and run the above program, this will produce the following result.
Immutable Navigable map is :{1=[ 1, Julie ], 2=[ 2, Robert ], 3=[ 3, Adam ]}
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