哈希表类size()方法 (Hashtable 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 number of key-value pairs that exist in this Hashtable.
size()方法用于返回此哈希表中存在的键值对的数量。
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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
size() method does not throw an exception at the time of returning size.
返回size时， size()方法不会引发异常。
Syntax:
句法：
public int size();
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 int, it returns the number of key-value pairs exists in this Hashtable.
方法的返回类型为int ，它返回此哈希表中存在的键值对的数量。
Example:
例：
// Java program to demonstrate the example
// of int size() method of Hashtable
import java.util.*;
public class SizeOfHashtable {
public static void main(String[] args) {
// Instantiate a hashtable object
Hashtable ht = new Hashtable();
// By using put() method is to
// add the linked values in an
// Hashtable ht
ht.put(10, "C");
ht.put(20, "C++");
ht.put(30, "JAVA");
ht.put(40, "PHP");
ht.put(50, "SFDC");
// Display Hashtable
System.out.println("Hashtable: " + ht);
// By using size() method is to
// return the size of this Hashtable
int size = ht.size();
System.out.println("ht.size(): " + size);
}
}
Output
输出量
Hashtable: {10=C, 20=C++, 30=JAVA, 40=PHP, 50=SFDC}
ht.size(): 5
翻译自: https://www.includehelp.com/java/hashtable-size-method-with-example.aspx
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