treeset java

TreeSet類pollLast()方法 (TreeSet Class pollLast() method)

• pollLast() method is available in java.util package.

  pollLast()方法在java.util包中可用。

• pollLast() method is used to return the last highest element and then remove the element from this TreeSet.

  pollLast()方法用于返回最后一個最高元素，然后從此TreeSet中刪除該元素。

• pollLast() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  pollLast()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名訪問該方法，則會收到錯誤消息。

• pollLast() method does not throw an exception at the time of returning the highest element.

  返回最高元素時， pollLast()方法不會引發異常。

Syntax:

句法：

public Element pollLast();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is Element, it returns the last highest element from this TreeSet otherwise it returns null when no such element exists.

方法的返回類型為Element ，它返回此TreeSet中的最后一個最高元素，否則當不存在此類元素時返回null。

Example:

例：

// Java program to demonstrate the example // of Element pollLast() method of TreeSet import java.util.*;public class PollLastOfTreeSet {public static void main(String[] args) {// Instantiates a TreeSet objectTreeSet < String > tree_set = new TreeSet < String > ();// By using add() method is to add//the given object of this TreeSet tree_set.add("C");tree_set.add("C++");tree_set.add("JAVA");tree_set.add("PHP");tree_set.add("SFDC");// Display TreeSetSystem.out.println("TreeSet: " + tree_set);// By using pollLast() method is to return// the last highest element and then remove// the element exists from this TreeSetObject last_highest = tree_set.pollLast();// Display last_highestSystem.out.println("tree_set.pollLast(): " + last_highest);// Display Modified TreeSetSystem.out.println("Modified TreeSet: " + tree_set);} }

Output

輸出量

TreeSet: [C, C++, JAVA, PHP, SFDC] tree_set.pollLast(): SFDC Modified TreeSet: [C, C++, JAVA, PHP]

翻譯自: https://www.includehelp.com/java/treeset-polllast-method-with-example.aspx

treeset java

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