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Collections checkedSet() method in Java with Examples
  • Last Updated : 08 Oct, 2018

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 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 elemnet 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 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 elemnet 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]

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