Here is an example of using the class Hashtable. It is got from google but was changed a little bit.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Hashtable;
import java.util.Map;
import java.util.TreeMap;

public class Main{
public static void main(String[] args) throws IOException{
int key;
try{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("How many elements you want to enter to the hash table : ");
int n = Integer.parseInt(in.readLine());
Hashtable<Integer, String> hashTable = new Hashtable<Integer, String>();
for(int i = 0; i < n; i++){
System.out.print("Enter key for the hash table : ");
key = Integer.parseInt(in.readLine());
System.out.print("Enter value for the key : ");
hashTable.put(key, in.readLine());
}
Map<Integer, String> map = new TreeMap<Integer, String>(hashTable);
System.out.println(map);
}
catch(NumberFormatException ne){
System.out.println(ne.getMessage() + " is not a legal value.");
System.out.println("Please enter a numeric value.");
System.exit(1);
}
}
}

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