java treemap_Java TreeMap lastKey()方法与示例
java treemap
TreeMap類(lèi)lastKey()方法 (TreeMap Class lastKey() method)
lastKey() method is available in java.util package.
lastKey()方法在java.util包中可用。
lastKey() method is used to return the last highest key element value exists in this TreeMap.
lastKey()方法用于返回此TreeMap中存在的最后一個(gè)最高鍵元素值。
lastKey() 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.
lastKey()方法是一種非靜態(tài)方法,只能通過(guò)類(lèi)對(duì)象訪(fǎng)問(wèn),如果嘗試使用類(lèi)名稱(chēng)訪(fǎng)問(wèn)該方法,則會(huì)收到錯(cuò)誤消息。
lastKey() method may throw an exception at the time of returning the last highest key-value element.
返回最后一個(gè)最高鍵值元素時(shí), lastKey()方法可能會(huì)引發(fā)異常。
NoSuchElementException: This exception may throw when this TreeMap is blank.
NoSuchElementException :如果此TreeMap為空白,則可能引發(fā)此異常。
Syntax:
句法:
public Key lastKey();Parameter(s):
參數(shù):
It does not accept any parameter.
它不接受任何參數(shù)。
Return value:
返回值:
The return type of the method is Key, it retrieves the last higest key element exists in this TreeMap.
方法的返回類(lèi)型為Key ,它檢索此TreeMap中存在的最后一個(gè)higest key元素。
Example:
例:
// Java program to demonstrate the example // of Key lastKey() method of TreeMap import java.util.*;public class LastKeyOfTreeMap {public static void main(String[] args) {// Instantiates TreeMapTreeMap < Integer, String > tm = new TreeMap < Integer, String > ();// By using put() method is// to put the key-value pairs in// treemap tmtm.put(1, "C");tm.put(4, "C++");tm.put(3, "Java");tm.put(2, "Php");// Display TreeMap tmSystem.out.println("tm: " + tm);// By using lastKey() method is// used to return the key element// linked with the largest key element // value i.e. 4// Display Returned Key ElementSystem.out.println("tm.lastKey(): " + tm.lastKey());} }Output
輸出量
tm: {1=C, 2=Php, 3=Java, 4=C++} tm.lastKey(): 4翻譯自: https://www.includehelp.com/java/treemap-lastkey-method-with-example.aspx
java treemap
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