MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.util.HashMap;
import java.util.Map;

public class MainClass {
    public static void main(String[] a) {

        Map map = new HashMap();
        map.put("key1", "value1");
        map.put("key2", "value2");
        map.put("key3", "value3");

        System.out.println(map.containsKey("key1"));
        System.out.println(map.containsValue("value2"));
    }
}