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treeset java
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个最高元素,然后从此TreeSet中删除该元素。
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()方法是一个非静态方法,只能通过类对象访问,如果尝试使用类名访问该方法,则会收到错误消息。
pollLast() method does not throw an exception at the time of returning the highest element.
返回最高元素时, pollLast()方法不会引发异常。
Syntax:
句法:
public Element pollLast();
Parameter(s):
参数:
It does not accept any parameter.
它不接受任何参数。
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.
方法的返回类型为Element ,它返回此TreeSet中的最后一个最高元素,否则当不存在此类元素时返回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 object TreeSet < 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 TreeSet System.out.println("TreeSet: " + tree_set); // By using pollLast() method is to return // the last highest element and then remove // the element exists from this TreeSet Object last_highest = tree_set.pollLast(); // Display last_highest System.out.println("tree_set.pollLast(): " + last_highest); // Display Modified TreeSet System.out.println("Modified TreeSet: " + tree_set); }}
Output
输出量
TreeSet: [C, C++, JAVA, PHP, SFDC]tree_set.pollLast(): SFDCModified TreeSet: [C, C++, JAVA, PHP]
翻译自:
treeset java
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