java treemap

TreeMap類的size()方法 (TreeMap Class size() method)

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

  size()方法在java.util包中可用。

• size() method is used to return the size of this TreeMap or in other words, we can say it returns the number of key-value pairs that exist in this TreeMap.

  size()方法用于返回此TreeMap的大小，換句話說，我們可以說它返回此TreeMap中存在的鍵/值對的數量。

• size() 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.

  size()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。

• size() method does not throw an exception at the time of returning size.

  返回size時， size()方法不會引發異常。

Syntax:

句法：

public int size();

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 int, it returns the number of existing key-value pairs in this TreeMap.

方法的返回類型為int ，它返回此TreeMap中現有的鍵值對的數量。

Example:

例：

// Java program to demonstrate the example // of int size() method of TreeMap import java.util.*;public class SizeOfTreeMap {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 size() method is to // return the size of this TreeMapint size = tm.size();// Display size of TreeMap tmSystem.out.println("tm.size(): " + size);} }

Output

輸出量

tm: {1=C, 2=Php, 3=Java, 4=C++} tm.size(): 4

翻譯自: https://www.includehelp.com/java/treemap-size-method-with-example.aspx

java treemap

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