Clone a List in Java

2019-10-22 2020-05-20

java / arraylist

a few seconds read (About 93 words)

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Using a Copy Constructor

ArrayList cloned = new ArrayList(collection c);

ArrayList<Integer> nums = new ArrayList<>(Arrays.asList(1, 2, 3, 4));
ArrayList<Integer> nums2 = new ArrayList<>(nums);
nums2.add(5);

System.out.println(nums);
System.out.println(nums2);

Using the addAll() method

boolean addAll(Collection c);

ArrayList<Integer> nums = new ArrayList<>(Arrays.asList(1, 2, 3, 4));
        ArrayList<Integer> nums2 = new ArrayList<>();

        nums2.addAll(nums);

Using streams in Java 8

1 2	ArrayList<Integer> nums = new ArrayList<>(Arrays.asList(1, 2, 3, 4)); List<Integer> nums2 = nums.stream().collect(Collectors.toList());

Using the clone() method

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2
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// Creating an empty list 
ArrayList<Integer> nums = new ArrayList<>(Arrays.asList(1, 2, 3, 4));
List<Integer> nums2 = (List<Integer>) nums.clone();

arraylist, java

Clone a List in Java

Using a Copy Constructor

Using the addAll() method

Using streams in Java 8

Using the clone() method

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