java.util.Hashtable.clear（）方法

package com.codingdict;

import java.util.*;

public class HashTableDemo {
   public static void main(String args[]) {

      // create hash table
      Hashtable htable = new Hashtable();

      // put values into the table
      htable.put(1, "A");
      htable.put(2, "B");
      htable.put(3, "C");
      htable.put(4, "D");

      // check table content
      System.out.println("Hash table content: "+htable);

      // clear the table
      htable.clear();

      // check content after clear
      System.out.println("Hash table content after clear: "+htable);      
   }    
}