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Java - shuffle ArrayList
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In this article, we would like to show you how to shuffle ArrayList in Java.
Quick solution:
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Collections.shuffle(myArrayList);
In this example, we use Collections.shuffle() method to randomize numbers ArrayList.
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import java.util.*;2
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public class Example {4
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public static void main(String[] args) {6
List<Integer> numbers = new ArrayList<>();7
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numbers.add(1);9
numbers.add(2);10
numbers.add(3);11
numbers.add(4);12
numbers.add(5);13
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System.out.println("Before: " + numbers);15
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Collections.shuffle(numbers); // shuffle ArrayList17
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System.out.println("After: " + numbers);19
}20
}Output:
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Before: [1, 2, 3, 4, 5]2
After: [1, 5, 4, 3, 2]