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How can you make a Collection class read Only in Java?

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Pragya Keshap answered on February 4, 2023 Popularity 2/10 Helpfulness 1/10

answer How can you make a Collection class read Only in Java?

How can you make a Collection class read Only in Java?

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In Java, there are useful methods to make a Collection class read

Only. We can make the Collection read Only by using one of the

following methods:

Collections.unmodifiableMap(Map m)

Collections.unmodifiableList(List l)

Collections.unmodifiableSet(Set s)

Collections.unmodifiableCollection(Collection c)

class GFG {
 
    public static void main(String[] args)
    {
        // Set of Integer
        Set<Integer> numbers = new HashSet<Integer>();
 
        // Set have 1 to 10 numbers
        for (int i = 1; i <= 5; i++) {
            numbers.add(i);
        }
 
        // print the integers
        numbers.stream().forEach(System.out::print);
 
        // Removing element from the list
        numbers.remove(5);
 
        System.out.println("\nAfter Performing Operation");
 
        numbers.stream().forEach(System.out::print);
 
        System.out.println(
            "\nSet is also By Default Readable and Writable");
 
        // Now making Read-Only Set
        // Using unmodifiableSet() method.
        try {
            numbers = Collections.unmodifiableSet(numbers);
 
            // This line will generate an Exception
            numbers.remove(4);
        }
        catch (UnsupportedOperationException
                   unsupportedOperationException) {
            System.out.println(
                "Exceptions is "
                + unsupportedOperationException);
        }
        finally {
            System.out.println(numbers.contains(3));
            System.out.println("Now Set is Read-Only");
        }
    }
}

https://www.geeksforgeeks.org/how-to-make-a-collection-read-only-in-java/#:~:text=The%20unmodifiableCollection()%20is%20a,()%20to%20make%20Read%2DOnly.

Popularity 2/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: class java

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

How can you make a Collection class read Only in Java?

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