- Java.util Package Classes
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- Java.util - ArrayDeque
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- Java.util - BitSet
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- Java.util - Currency
- Java.util - Date
- Java.util - Dictionary
- Java.util - EnumMap
- Java.util - EnumSet
- Java.util - Formatter
- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java Collections checkedCollection() Method
Description
The Java Collections checkedCollection(Collection<E>, Class<E>) method is used to get a dynamically typesafe view of the specified collection.
Declaration
Following is the declaration for java.util.Collections.checkedCollection() method.
public static <E> Collection<E> checkedCollection(Collection<E> c,Class<E> type)
Parameters
c − This is the collection for which a dynamically typesafe view is to be returned.
type − This is the type of element that c is permitted to hold.
Return Value
The method call returns a dynamically typesafe view of the specified collection.
Exception
NA
Getting a TypeSafe View of Collection of Integers Example
The following example shows the usage of Java Collection checkedCollection(Collection,Class ) method to get a typesafe view of collection of integers. We've created a List object with some integers, printed the original list. Using checkedCollection(Collection, Integer) method, we're getting a collection of Integer and then it is printed.
package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { List<Integer> list = new ArrayList<>(Arrays.asList(1,2,3,4,5)); System.out.println("Initial collection value: " + list); Collection<Integer> safeList = Collections.checkedCollection(list, Integer.class); System.out.println("Typesafe View: "+safeList); } }
Output
Let us compile and run the above program, this will produce the following result.
Initial collection value: [1, 2, 3, 4, 5] Typesafe View: [1, 2, 3, 4, 5]
Getting a TypeSafe View of Collection of Strings Example
The following example shows the usage of Java Collection checkedCollection(Collection,Class ) method to get a typesafe view of collection of strings. We've created a List object with some strings, printed the original list. Using checkedCollection(Collection, String) method, we're getting a collection of String and then it is printed.
package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { List<String> list = new ArrayList<>(Arrays.asList("Welcome","to","Tutorialspoint")); System.out.println("Initial collection value: " + list); Collection<String> safeList = Collections.checkedCollection(list, String.class); System.out.println("Typesafe View: "+safeList); } }
Output
Let us compile and run the above program, this will produce the following result.
Initial collection value: [Welcome, to, Tutorialspoint] Typesafe View: [Welcome, to, Tutorialspoint]
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