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Collections checkedSet() method in Java with Examples

Last Updated : 06 Jun, 2021
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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 value import 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 value import 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]

 

R
rohitprasad3
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