IdentityHashMap類的size()方法 (IdentityHashMap 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 (i.e. How many key-value pair exists) of this IdentityHashMap.

  size()方法用于返回此IdentityHashMap的大小(即，存在多少個鍵值對)。

• 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(tài)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(fā)異常。

Syntax:

句法：

public int size();

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 int, it returns the size of this IdentityHashMap.

方法的返回類型為int ，它返回此IdentityHashMap的大小。

Example:

例：

// Java program to demonstrate the example // of int size() method of IdentityHashMap import java.util.*;public class SizeOfIdentityHashMap {public static void main(String[] args) {// Instantiates a IdentityHashMap objectMap < Integer, String > map = new IdentityHashMap < Integer, String > ();// By using put() method is to add// key-value pairs in a IdentityHashMapmap.put(10, "C");map.put(20, "C++");map.put(50, "JAVA");map.put(40, "PHP");map.put(30, "SFDC");//Display IdentityHashMapSystem.out.println("IdentityHashMap: " + map);// By using size() method is to return// the size of this IdentityHashMapint size = map.size();// Display sizeSystem.out.print("map.size(): " + size);} }

Output

輸出量

IdentityHashMap: {20=C++, 40=PHP, 50=JAVA, 30=SFDC, 10=C} map.size(): 5

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

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