Java uses the shuffle() function of the Collections class to disrupt the order of elements in the collection.

Java uses the shuffle() function of the Collections class to disrupt the order of elements in the collection

In the Java programming language, the Collections class is a tool class that provides various static methods for operating collections. One of them is the shuffle() function, which can be used to shuffle the order of elements in a collection. This article demonstrates how to use this function and provides corresponding code examples.

First, we need to import the Collections class in the java.util package in order to use the shuffle() function. The sample code is as follows:

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ShuffleExample {

    public static void main(String[] args) {
        List<Integer> numbers = new ArrayList<>();
        
        // 向集合中添加元素
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(5);
        numbers.add(6);
        
        System.out.println("打乱前的集合顺序：" + numbers);
        
        // 使用shuffle()函数打乱集合元素的顺序
        Collections.shuffle(numbers);
        
        System.out.println("打乱后的集合顺序：" + numbers);
    }
}

In the above code, we create an ArrayList collection numbers and add some integer elements to it. Then, we print out the collection order before shuffling.

Next, we use the shuffle() function of the Collections class to shuffle the order of the collection elements. This function receives a List type parameter and uses the default random source for shuffling.

Finally, we print out the shuffled collection order again. Run the program and you will see output similar to the following:

打乱前的集合顺序：[1, 2, 3, 4, 5, 6]
打乱后的集合顺序：[4, 2, 1, 5, 3, 6]

As you can see, the order of the elements in the collection has been successfully shuffled.

In addition to List collections, the shuffle() function can also be used to shuffle other types of collections, such as Set and Queue. Just pass the corresponding collection object to the shuffle() function.

It should be noted that the shuffle() function will modify the original collection object and will not create a new shuffled collection. If you need to preserve the order of the original collection, you can make a copy of the collection and then use the shuffle() function on the copied collection.

Summary:
In this article, we introduced the use of the shuffle() function of the Collections class in Java to disrupt the order of elements in the collection. By using this function, you can easily shuffle the order of elements in a collection, making them more random. This is very useful in certain application scenarios, such as random draws or shuffle games.

I hope this article will help you understand and use the shuffle() function of Java's Collections class!

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