The checkedSet() method of java.util.Collections class is used to return a dynamically typesafe view of the specified set.
The returned set will be serializable if the specified set is serializable.
Since null is considered to be a value of any reference type, the returned set permits insertion of null elements whenever the backing set does.
Syntax:
public static Set checkedSet(Set s, Class type)
Parameters: This method takes the following argument as a parameter
- s: the set for which a dynamically typesafe view is to be returned
- type: the type of element that s is permitted to hold
Return Value: This method returns a dynamically typesafe view of the specified set.
Below are the examples to illustrate the checkedSet() method
Example 1:
Java
// Java program to demonstrate// checkedSet() method// for String valueimport java.util.*;public class GFG1 { public static void main(String[] argv) throws Exception { try { // creating object of Set<String> Set<String> hset = new TreeSet<String>(); // Adding element to hmap hset.add("Ram"); hset.add("Gopal"); hset.add("Verma"); // print the set System.out.println("Set: " + hset); // create typesafe view of the specified set Set<String> tsset = Collections .checkedSet(hset, String.class); // printing the typesafe view of specified list System.out.println("Typesafe view of Set: " + tsset); } catch (IllegalArgumentException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
Set: [Gopal, Ram, Verma] Typesafe view of Set: [Gopal, Ram, Verma]
Example 2:
Java
// Java program to demonstrate// checkedSet() method// for Integer valueimport java.util.*;public class GFG1 { public static void main(String[] argv) throws Exception { try { // creating object of Set<Integer> Set<Integer> hset = new TreeSet<Integer>(); // Adding element to hset hset.add(20); hset.add(30); hset.add(40); // print the set System.out.println("Set: " + hset); // create typesafe view of the specified set Set<Integer> tsset = Collections .checkedSet(hset, Integer.class); // printing the typesafe view of specified list System.out.println("Typesafe view of Set: " + tsset); } catch (IllegalArgumentException e) { System.out.println("Exception thrown : " + e); } }} |
Output:
Set: [20, 30, 40] Typesafe view of Set: [20, 30, 40]