java treemap_Java TreeMap lastKey()方法与示例
java treemap
TreeMap類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()方法是一種非靜態方法,只能通過類對象訪問,如果嘗試使用類名稱訪問該方法,則會收到錯誤消息。
lastKey() method may throw an exception at the time of returning the last highest key-value element.
返回最后一個最高鍵值元素時, lastKey()方法可能會引發異常。
NoSuchElementException: This exception may throw when this TreeMap is blank.
NoSuchElementException :如果此TreeMap為空白,則可能引發此異常。
Syntax:
句法:
public Key lastKey();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 Key, it retrieves the last higest key element exists in this TreeMap.
方法的返回類型為Key ,它檢索此TreeMap中存在的最后一個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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