Use the last() method of the TreeSet class to get the last element in the tree collection

Use the last() method of the TreeSet class to obtain the last element in the tree collection

TreeSet is an ordered collection in the Java collection framework, which is implemented based on the red-black tree data structure. The elements are sorted according to natural order or a custom comparator. In TreeSet, we can easily get the last element in the set, which is the largest element.

In TreeSet, we can use the last() method to get the last element. This method returns the last (largest) element in the collection. The following is a code example:

import java.util.TreeSet;

public class TreeSetExample {
    public static void main(String[] args) {
        TreeSet<Integer> treeSet = new TreeSet<>();
        
        treeSet.add(5);
        treeSet.add(2);
        treeSet.add(8);
        treeSet.add(1);
        treeSet.add(6);
        
        // 使用last()方法获取最后一个元素
        int lastElement = treeSet.last();
        
        System.out.println("最后一个元素是：" + lastElement);
    }
}

In the above code, we first create a TreeSet object and add some elements to it. We then use the last() method to get the last element and save it in a variable. Finally, we display the results by printing the output.

Run this code, the output is:

最后一个元素是：8

As you can see, we successfully obtained the last element, which is the largest element in the collection. In TreeSet, by using the last() method, we can easily get the last element in the set.

It should be noted that if the TreeSet is an empty collection, that is, there are no elements, then calling the last() method will throw a NoSuchElementException exception. Therefore, before using the last() method, we need to ensure that there is at least one element in the collection.

To summarize, you can easily get the last element in the tree collection using the last() method of the TreeSet class. By using this method, we can easily find the largest element in the collection and process it accordingly.

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