How to Copy a Set in Java - Step by Step Examples

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How to Copy a Set in Java ?

Answer

To copy a Set in Java, you can use the copy constructor or the addAll() method.

✐ Examples

1 Copy a Set using Copy Constructor

In this example,

We have an existing Set named originalSet with some elements.
We create a new Set named copiedSet using the copy constructor HashSet(originalSet).
The copy constructor creates a new Set with the same elements as the original Set.

Java Program

Set<String> originalSet = new HashSet<>(Arrays.asList("apple", "banana", "cherry"));
Set<String> copiedSet = new HashSet<>(originalSet);
System.out.println("Original Set: " + originalSet);
System.out.println("Copied Set: " + copiedSet);

Output

Original Set: [apple, banana, cherry]
Copied Set: [apple, banana, cherry]

2 Copy a Set using addAll() Method

In this example,

We have an existing Set named originalSet with some elements.
We create a new Set named copiedSet and add all elements from originalSet using the addAll() method.
The addAll() method adds all elements from the specified collection to the new Set.

Java Program

Set<String> originalSet = new HashSet<>(Arrays.asList("apple", "banana", "cherry"));
Set<String> copiedSet = new HashSet<>();
copiedSet.addAll(originalSet);
System.out.println("Original Set: " + originalSet);
System.out.println("Copied Set: " + copiedSet);

Output

Original Set: [apple, banana, cherry]
Copied Set: [apple, banana, cherry]

Summary

In this tutorial, we learned How to Copy a Set in Java language with well detailed examples.

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How to Copy a Set in Java - Step by Step Examples

How to Copy a Set in Java ?

Answer

✐ Examples

1 Copy a Set using Copy Constructor

Java Program

Output

2 Copy a Set using addAll() Method

Java Program

Output

Summary

More Java Sets Tutorials