Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.HashMap;

public class Main {
    public static void main(String args[]) {
        HashMap<Integer, String> newmap = new HashMap<Integer, String>();

        // populate hash map
        newmap.put(1, "tutorials");
        newmap.put(2, "from");
        newmap.put(3, "java2s.com");

        System.out.println("Map value before change: " + newmap);

        // put new values at key 3
        String prevvalue = (String) newmap.put(3, "is great");

        // check returned previous value
        System.out.println("Returned previous value: " + prevvalue);

        System.out.println("Map value after change: " + newmap);
    }
}