Java Collection How to - Replace key and value in hashmap with identical key and different values

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Question

We would like to know how to replace key and value in hashmap with identical key and different values.

Answer

import java.util.HashMap;
import java.util.Map;
//w  ww  .j av a2  s  .  c o m
public class Main {
  public static void main(String args[]) {
    Map<Integer, String> mils = new HashMap<>();
    mils.put(1, "foo");
    mils.put(2, "bar");
    System.out.println("mils:\t" + mils);
    mils.put(1, "bar");
    System.out.println("mils:\t" + mils);
  }
}

The code above generates the following result.

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