Java 获取哈希表的大小

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import java.util.Hashtable;

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 /**

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 * 时 代 J a v a - N o w J a v a . c o m 

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public class Main {

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  public static void main(String[] args) {

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    Hashtable ht = new Hashtable();

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    System.out.println("Size of Hashtable : " + ht.size());

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    //add key value pairs to Hashtable using put method

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    ht.put("1","One");

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    ht.put("2","Two");

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    ht.put("3","Three");

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    System.out.println("Size of Hashtable after addition : " + ht.size());

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    Object obj = ht.remove("2");

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