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Java Collections checkedQueue() Method

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

Syntax

Following is the declaration of checkedQueue() method:

Parameter

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

Returns

The checkedQueue() method returns a dynamically typesafe view of the specified Queue.

Exceptions

ClassCastException

Compatibility Version

Java 1.8 and above

Example 1

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Output:

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

Example 2

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Output:

Type safe view of the Queue is: [55, 66, 66, 77, 88, 77]

Example 3

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Output:

[1, 2, 5]
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$CheckedCollection.typeCheck(Collections.java:3038)
	at java.base/java.util.Collections$CheckedQueue.offer(Collections.java:3188)
	at myPackage.CollectionCheckedQueueExample3.main(CollectionCheckedQueueExample3.java:12)





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