@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+  <classpathentry kind="src" path="src/test/java" output="target/test-classes" including="**/*.java"/>
+  <classpathentry kind="src" path="src/main/java" including="**/*.java"/>
+  <classpathentry kind="output" path="target/classes"/>
+  <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+  <classpathentry kind="var" path="M2_REPO/junit/junit/3.8.1/junit-3.8.1.jar"/>
+</classpath>
@@ -0,0 +1,25 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.hmkcode</groupId>
+  <artifactId>java-list-map</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>java-list-map</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>
@@ -0,0 +1,68 @@
+package com.hmkcode;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+import com.hmkcode.vo.Person;
+
+public class ListApp 
+{
+
+    public static void main( String[] args )
+    {
+
+        // ( 1 ) List
+
+        // A. Initiate
+        List<Person> arrayList = new ArrayList<Person>();
+        List<Person> linkedList = new LinkedList<Person>();
+
+        // B. Populate
+        for(Person person:getPersons()){
+        	arrayList.add(person);
+        	linkedList.add(person);
+        }
+
+        // --> print
+        System.out.println("--------- Print All -------------");
+
+        System.out.println("ArrayList: "+arrayList);
+        System.out.println("LinkedList: "+linkedList);
+
+        // C. Iterate
+        System.out.println("--------- Print Iterate by index -------------");
+
+        for(int i = 0; i < linkedList.size(); i++){
+        	System.out.println("LinkedList[ "+i+" ]"+linkedList.get(i));        	
+        }
+
+        System.out.println("--------- Print Iterate by for each -------------");
+
+        //this is an efficient way to iterate
+        for(Person person:linkedList){
+        	System.out.println("LinkedList: "+person);
+        }
+
+        // D. Sort
+        Collections.sort(linkedList);
+
+        // --> print
+        System.out.println("--------- Print Sorted List -------------");
+
+        System.out.println("Sorted LinkedList: "+linkedList);
+    }
+
+    private static Person[] getPersons(){
+    	Person[] persons = new Person[5];
+
+    	persons[0] = new Person("Brit", 29);
+    	persons[1] = new Person("John", 32);
+    	persons[2] = new Person("Jack", 27);
+    	persons[3] = new Person("Jenifer", 24);
+    	persons[4] = new Person("Brit", 37);
+
+    	return persons;
+    }
+}
@@ -0,0 +1,98 @@
+package com.hmkcode;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.TreeMap;
+
+
+import com.hmkcode.vo.Person;
+
+
+public class MapApp 
+{
+	
+    public static void main( String[] args )
+    {
+       
+        
+        // ( 1 ) Map
+        
+        // A. Initiate
+        Map<String,Person> hashMap = new HashMap<String,Person>();
+        Map<String,Person> treeMap = new TreeMap<String,Person>();
+        
+        // B. Populate
+        int k = 0 ;
+        for(Person person:getPersons()){
+        	hashMap.put(""+k,person);
+        	treeMap.put(""+k++,person);
+        }
+        
+        // --> print
+        System.out.println("--------- Print All -------------");      
+        System.out.println("HashMap: "+hashMap);
+        System.out.println("TreeMap: "+treeMap);
+
+
+        // C. Iterate
+        // --> print
+    	System.out.println("--------- Print Iterate by get(key) -------------");     
+        for(String key:treeMap.keySet()){
+        		
+        	System.out.println("treeMap: [key: "+key+" , value: "+treeMap.get(key));
+        }
+        // --> print
+    	System.out.println("--------- Print Iterate by Entry -------------");  
+        for(Entry<String, Person> entry:treeMap.entrySet()){
+    		
+        	System.out.println("treeMap: [key: "+entry.getKey()+" , value: "+entry.getValue());
+        }   
+                        
+        // D. Sort by value
+        TreeMap<String,Person> sorted_map = new TreeMap<String,Person>(new ValueComparator());
+        sorted_map.putAll(hashMap);
+                
+        
+        // --> print
+        System.out.println("--------- Print Sorted Map by Value -------------");       
+        System.out.println("Sorted HashMap: "+sorted_map);
+        
+        
+        // E. Convert Map to List
+        
+        List<Person> persons = new ArrayList<Person>(sorted_map.values());
+        
+        // --> print
+        System.out.println("--------- Print List<Person> -------------");
+        System.out.println("List<Person>: "+persons);
+    }
+    
+    private static Person[] getPersons(){
+    	Person[] persons = new Person[5];
+    	
+    	persons[0] = new Person("Brit", 29);
+    	persons[1] = new Person("John", 32);
+    	persons[2] = new Person("Jack", 27);
+    	persons[3] = new Person("Jenifer", 24);
+    	persons[4] = new Person("Brit", 37);
+
+    	return persons;
+    }
+}
+class ValueComparator implements Comparator {
+	  
+	  Map map;
+	  
+	  public ValueComparator(){
+	  	
+	  }
+	  public int compare(Object keyA, Object keyB){
+	  		  	
+	  	return ((String) keyA).compareTo((String) keyB);
+	  	
+	  }
+}
@@ -0,0 +1,34 @@
+package com.hmkcode.vo;
+
+public class Person implements Comparable<Person> {
+
+	private int age;
+	private String name;
+	
+	public Person(String name, int age){
+		this.name = name;
+		this.age = age;
+	}
+	public int getAge() {
+		return age;
+	}
+	public void setAge(int age) {
+		this.age = age;
+	}
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	@Override
+	public String toString() {
+		return "Person [age=" + age + ", name=" + name + "]";
+	}
+	@Override
+	public int compareTo(Person person) {
+		return this.age-person.getAge();
+	}
+	
+	
+}