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Java Collections checkedList() Method

The checkedList() is a method of Java Collections class which returns a dynamically typesafe view of the specified list. If an element inserted of the wrong type, it will result in an immediate ClassCastException.

Syntax

Following is the declaration of checkedList() method:

Parameter

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

Returns

The checkedList() method returns a dynamically typesafe view of the specified List.

Exceptions

ClassCastException

Compatibility Version

Java 1.5 and above

Example 1

Test it Now

Output:

Type safe view of the List is: [A, B, C, D]

Example 2

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Output:

Checked list content: [one, two, three, four]
Exception in thread "main" java.lang.ClassCastException: Attempt to insert class java.lang.Integer element into collection with element type class java.lang.String
	at java.base/java.util.Collections$CheckedCollection.typeCheck(Collections.java:3038)
	at java.base/java.util.Collections$CheckedCollection.add(Collections.java:3081)
	at myPackage.CollectionCheckedListExample2.main(CollectionCheckedListExample2.java:15)

Example 3

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Output:

Type safe view of the List is: [10, 20, 30, 40]

Example 4

Test it Now

Output:

[RAJ]
[RAJ, 2]





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