src/main/java and src/test/java not created in Eclipse Maven Project

ISSUE

When I tried to Create a Maven Project in Eclipse, I couldn't see src/main/java and src/test/java source folders.

SOLUTION

Follow the below steps to resolve the issue.

1. Right click the Maven Project -> Build Path -> Configure Build Path

2. In Order and Export tab, you can see the message like '2 build path entries are missing'

3. Now select 'JRE System Library' and 'Maven Dependencies' checkbox

4. Click OK

Now you can see below in all type of Explorers (Package or Project or Navigator)

src/main/java

src/main/resources

src/test/java

Different Ways of Looping the Map in Java

INTRODUCTION

There are multiple ways to loop through a Map and display the Key and Value. They are:

1. Using EntrySet
2. Using KeySet
3. Using Iterator
4. Using Map Values

Below example will provide different ways of looping the Map Keys and its values.

EXAMPLE

import java.util.Collection; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import java.util.Set; public class LoopingMap {  public static void main(String[] args) {    Map<String, String> map = new HashMap<String, String>();    map.put("1000", "Ranjith");    map.put("2000", "Sekar");    map.put("3000", "Bala");    map.put("4000", "Kumar");    map.put("5000", "Rekha");    // Way 1: Using EntrySet    System.out.println("===1. Using Map's EntrySet===");    Set<Map.Entry<String, String>> entries = map.entrySet();    for (Map.Entry<String, String> entry : entries) {      System.out.println(entry.getKey() + " >> " + entry.getValue());    }    // Way 2: Using keySet    System.out.println("\n===2. Using Map's KeySet===");    Set<String> str = map.keySet();    for (Object obj : str) {      System.out.println(obj.toString() + " >> " + map.get(obj.toString()));    }    // Way 3: Using Iterator    System.out.println("\n===3. Using Iterator===");    Iterator<Entry<String, String>> iterator = map.entrySet().iterator();    while (iterator.hasNext()) {      Entry<String, String> entry = iterator.next();      System.out.println(entry.getKey() + " >> " + entry.getValue());    }    // Way 4: Using Map's Value (Iterators only Values in the Map)    System.out.println("\n===4. Using Map's Values===");    Collection<String> collection = map.values();    Iterator<String> itr = collection.iterator();    while (itr.hasNext()) {      System.out.println(itr.next());    }  } }

OUTPUT

===1. Using Map's EntrySet=== 5000 >> Rekha 3000 >> Bala 4000 >> Kumar 1000 >> Ranjith 2000 >> Sekar ===2. Using Map's KeySet=== 5000 >> Rekha 3000 >> Bala 4000 >> Kumar 1000 >> Ranjith 2000 >> Sekar ===3. Using Iterator=== 5000 >> Rekha 3000 >> Bala 4000 >> Kumar 1000 >> Ranjith 2000 >> Sekar ===4. Using Map's Values=== Rekha Bala Kumar Ranjith Sekar