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HashtableTest.java

import java.util.*;
public class 
HashtableTest {
   
public static void 
main(String[] args) {
      Hashtable h = 
new 
Hashtable();
      h.put(
"Name"new String("jabook"
));
      h.put(
"Age"new Integer(27
));
      h.put(
"Height"new Double(175.5
));
      System.out.println(h.size());
      h.clear();
      System.out.println(
"===================="
);
      System.out.println(h.size());
   }
}

D:\javaclass\111>javac HashtableTest.java
D:\javaclass\111>java HashtableTest
3
====================
0

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