Java Collections checkedSet() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections checkedSet() Method

The checkedSet() is an inbuilt method of Java Collections class. This method is used to get a dynamically typesafe view of the specified Set.

Syntax

Following is the declaration of checkedSet() method:

Parameter

Parameter	Description	Required/Optional
s	It is the set for which a dynamically typesafe view is to be returned.	Required
type	It is the type of element that s is permitted to hold.	Required

Returns

The checkedSet() method automatically returns a dynamically typesafe view of the specified Set in the ascending order.

Exceptions

ClassCastException

Compatibility Version

Java 1.5 and above

Example 1

  import java.util.*;  public class CollectionsCheckedSetExample1 {  public static void main(String[] args) {  TreeSet set = new TreeSet();  //Insert values in the Set  set.add(“TutorAspire”);  set.add(“Hindi100”);  set.add(“SSSIT”);  set.add(“JavaTraining”);        //Get type safe view of the Set                System.out.println(“Type safe view of the Set is: “+Collections.checkedSet(set,String.class));        }  }  

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Output:

Type safe view of the Set is: [Hindi100, TutorAspire , JavaTraining, SSSIT]

Example 2

  import java.util.*;  public class CollectionsCheckedSetExample2 {  public static void main(String[] args) {  TreeSet set = new TreeSet<>();  //Insert values in the Set  set.add(1100);  set.add(2200);  set.add(500);  set.add(900);        //Get type safe view of the Set    Set TypeSafeSet;  TypeSafeSet = Collections.checkedSet(set,Integer.class);        System.out.println(“The view of the Set is: “+TypeSafeSet);        }  }  

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Output:

The view of the Set is: [500, 900, 1100, 2200]

Example 3

  import java.util.*;  public class CollectionsCheckedSetExample3 {  public static void main(String[] args) {  Set set = new HashSet<>();              set = Collections.checkedSet(set, Integer.class);              set.add(1500);              set.add(1100);              set.add(1800);              System.out.println(“Dynamic type safe view of Set is: “+set);              Set set2 = set;              set2.add(“TutorAspire”);              System.out.println(set2);        }  }  

Test it Now

Output:

Dynamic type safe view of Set is: [1800, 1500, 1100]  Exception in thread "main" java.lang.ClassCastException: Attempt to insert class java.lang.String element into collection with element type class java.lang.Integer  at java.base/java.util.Collections$CheckedCollection.typeCheck(Collections.java:3038)  at java.base/java.util.Collections$CheckedCollection.add(Collections.java:3081)  at myPackage.CollectionCheckedSetExample3.main(CollectionCheckedSetExample3.java:12)

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Java Collections checkedSet() Method with Examples

Java Collections checkedSet() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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