Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("CSS", "style");
        map.put("HTML", "mark up");
        map.put("Oracle", "database");
        map.put("XML", "data");

        System.out.println("Map: " + map.toString());

        listValues(map);
        listEntries(map);
    }

    public static void listKeys(Map<String, String> map) {
        System.out.println("Key Set:");
        Set<String> keys = map.keySet();
        keys.forEach(System.out::println);
        System.out.println();
    }

    public static void listValues(Map<String, String> map) {
        System.out.println("Values Collection:");
        Collection<String> values = map.values();
        values.forEach(System.out::println);
        System.out.println();
    }

    public static void listEntries(Map<String, String> map) {
        System.out.println("Entry Set:");

        // Get the entry Set
        Set<Map.Entry<String, String>> entries = map.entrySet();
        entries.forEach((Map.Entry<String, String> entry) -> {
            String key = entry.getKey();
            String value = entry.getValue();
            System.out.println("key=" + key + ",  value=" + value);
        });
    }
}