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Hash Table in java

import java.util.*;
import java.io.*;
class ab
{
public static void main(String args[])throws Exception
{
Hashtable s =new Hashtable();

System.out.println(s);
s.put("1","a");
s.put("2","b");
s.put("3","c");
System.out.println(s);
System.out.println(s.get("0"));
System.out.println(s.get("1"));
System.out.println("Size of table is : "+s.size());
s.clear();
System.out.println("Size of table is : "+s.size());
}
}

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