- Java.util Package Classes
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- Java.util - LinkedHashMap
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- Java.util - Random
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- Java.util - SimpleTimeZone
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- Java.util - TimerTask
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- Java.util Package Extras
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- Java.util Useful Resources
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- Java.util - Discussion
Java Collections emptyNavigableMap() Method
Description
The Java Collections emptyNavigableMap() method is used to get the empty navigable map (immutable). This navigable map is serializable.
Declaration
Following is the declaration for java.util.Collections.emptyNavigableMap() method.
public static final <K,V> NavigableMap<K,V> emptyNavigableMap()
Parameters
NA
Return Value
NA
Exception
NA
Getting Empty NavigableMap of String, Integer Pair Example
The following example shows the usage of Java Collection emptyNavigableMap() method to get an empty navigable map of String, Integer pairs. We've created an empty navigable map using emptyNavigableMap() method and then tried adding few elements to it which results in exception.
package com.tutorialspoint; import java.util.Collections; import java.util.NavigableMap; public class CollectionsDemo { public static void main(String args[]) { // create an empty navigable map NavigableMap<String, Integer> emptyNavigableMap = Collections.emptyNavigableMap(); System.out.println("Created empty immutable navigable map: "+emptyNavigableMap); // try to add elements emptyNavigableMap.put("1", 1); emptyNavigableMap.put("2", 2); } }
Output
Let us compile and run the above program, this will produce the following result. Exception will be thrown as the navigable map is immutable.
Created empty immutable navigable map: {} Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.AbstractMap.put(AbstractMap.java:209) at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:15)
Getting Empty NavigableMap of String, String Pair Example
The following example shows the usage of Java Collection emptyNavigableMap() method to get an empty navigable map of String, String pairs. We've created an empty navigable map using emptyNavigableMap() method and then tried adding few elements to it which results in exception.
package com.tutorialspoint; import java.util.Collections; import java.util.NavigableMap; public class CollectionsDemo { public static void main(String args[]) { // create an empty navigable map NavigableMap<String, String> emptyNavigableMap = Collections.emptyNavigableMap(); System.out.println("Created empty immutable navigable map: "+emptyNavigableMap); // try to add elements emptyNavigableMap.put("1", "A"); emptyNavigableMap.put("2", "B"); } }
Output
Let us compile and run the above program, this will produce the following result. Exception will be thrown as the navigable map is immutable.
Created empty immutable navigable map: {} Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.AbstractMap.put(AbstractMap.java:209) at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:15)
Getting Empty NavigableMap of String, Object Pair Example
The following example shows the usage of Java Collection emptyNavigableMap() method to get an empty navigable map of String, Student object pairs. We've created an empty navigable map using emptyNavigableMap() method and then tried adding few elements to it which results in exception.
package com.tutorialspoint; import java.util.Collections; import java.util.NavigableMap; public class CollectionsDemo { public static void main(String args[]) { // create an empty navigable map NavigableMap<String, Object> emptyNavigableMap = Collections.emptyNavigableMap(); System.out.println("Created empty immutable navigable map: "+emptyNavigableMap); // try to add elements emptyNavigableMap.put("1", new Student(1, "Julie")); emptyNavigableMap.put("2", new Student(2, "Jene")); } } 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. Exception will be thrown as the navigable map is immutable.
Created empty immutable navigable map: {} Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.AbstractMap.put(AbstractMap.java:209) at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:15)
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