Java : Collection Framework : TreeMap (Key and value)

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TreeMapExample.java

import java.util.Set;
import java.util.TreeMap;

/*
 * Example of keySet() method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

        /*
         * Returns a Set view of the keys contained in this map. The set is
         * backed by the map, so changes to the map are reflected in the set,
         * and vice-versa.
         * 
         * If the map is modified while an iteration over the set is in progress
         * (except through the iterator's own remove operation), the results of
         * the iteration are undefined. The set supports element removal, which
         * removes the corresponding mapping from the map, via the
         * Iterator.remove, Set.remove, removeAll, retainAll, and clear
         * operations. It does not support the add or addAll operations.
         */
        Set<Integer> set = treeMap.keySet();

        System.out.println("set : " + set + "\n");

        System.out.println("-----------------------");
        System.out.println("Key" + " | " + "value");
        System.out.println("-----------------------");

        for( Integer key : set )
        {
            String value = treeMap.get(key);
            System.out.println(key + "   |  " + value);

        }

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

set : [1, 2, 3, 4]

-----------------------
Key | value
-----------------------
1   |  Cat
2   |  Dog
3   |  Ball
4   |  Apple

To Download TreeMapDemoKeyandValue Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoKeyandValue.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (KeySet)

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https://www.youtube.com/watch?v=lwa448Kf-NQ&list=UUhwKlOVR041tngjerWxVccw

TreeMapExample.java

import java.util.Set;
import java.util.TreeMap;

/*
 * Example of keySet() method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap +"\n");
      
        /*
         * Returns a Set view of the keys contained in this map. The set is
         * backed by the map, so changes to the map are reflected in the set,
         * and vice-versa. 
         * 
         * If the map is modified while an iteration over the
         * set is in progress (except through the iterator's own remove
         * operation), the results of the iteration are undefined. The set
         * supports element removal, which removes the corresponding mapping
         * from the map, via the Iterator.remove, Set.remove, removeAll,
         * retainAll, and clear operations. It does not support the add or
         * addAll operations.
         */
        Set<Integer> set = treeMap.keySet();

        System.out.println("set : " + set + "\n");

        for( Integer key : set )
        {
            System.out.println(key);
        }

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

set : [1, 2, 3, 4]

1
2
3
4

To Download TreeMapDemoKeySet Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoKeySet.zip?attredirects=0&d=1

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Java : Collection : TreeMap Sample Programs or Examples - Playlist

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Java : Collection : TreeMap - Playlist

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Java : Collection Framework : TreeMap (Remove)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of remove(Object key) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

        /*
         * Removes the mapping for this key from this TreeMap if present.
         * 
         * Returns: the previous value associated with key, or null if there was
         * no mapping for key. (A null return can also indicate that the map
         * previously associated null with key.)
         */

        String value = treeMap.remove(3);

        System.out.println("value : " + value + "\n");
        System.out.println("treeMap : " + treeMap + "\n");

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

value : Ball

treeMap : {1=Cat, 2=Dog, 4=Apple}

To Download TreeMapDemoRemove Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoRemove.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (PutReturn)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of put(K key,V value) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        /*
         * Associates the specified value with the specified key in this map. If
         * the map previously contained a mapping for the key, the old value is
         * replaced.
         * 
         * Returns: the previous value associated with key, or null if there was
         * no mapping for key. (A null return can also indicate that the map
         * previously associated null with key.)
         */
        String value = treeMap.put(1, "Apple");

        System.out.println("Previous value associated with key '1' : " + value);
        System.out.println("treeMap : " + treeMap + "\n");

        value = treeMap.put(1, "Ball");

        System.out.println("Previous value associated with key '1' : " + value);
        System.out.println("treeMap : " + treeMap);

    }
}

Output

Previous value associated with key '1' : null
treeMap : {1=Apple}

Previous value associated with key '1' : Apple
treeMap : {1=Ball}

To Download TreeMapDemoPutReturn Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoPutReturn.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (PutAll)

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https://www.youtube.com/watch?v=AHnX3bleK3U&list=UUhwKlOVR041tngjerWxVccw

TreeMapExample.java

import java.util.HashMap;
import java.util.TreeMap;

/*
 * Example of putAll(Map<? extends K,? extends V> map) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        HashMap<Integer, String> hashMap = new HashMap<Integer, String>();

        hashMap.put(1, "Cat");
        hashMap.put(2, "Dog");
        hashMap.put(4, "Apple");
        hashMap.put(3, "Ball");

        System.out.println("hashMap : " + hashMap + "\n");

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        /*
         * Copies all of the mappings from the specified map to this map. These
         * mappings replace any mappings that this map had for any of the keys
         * currently in the specified map.
         */
        treeMap.putAll(hashMap);

        System.out.println("treeMap : " + treeMap + "\n");

    }
}

Output

hashMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

To Download TreeMapDemoPutAll Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoPutAll.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (Put)

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https://www.youtube.com/watch?v=QqHhdViWIW0&list=UUhwKlOVR041tngjerWxVccw

TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of put(K key,V value) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        /*
         * Associates the specified value with the specified key in this map. If
         * the map previously contained a mapping for the key, the old value is
         * replaced.
         */
        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

To Download TreeMapDemoPut Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoPut.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (Constructor Accepts Map)

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TreeMapExample.java

import java.util.HashMap;
import java.util.TreeMap;

/*
 * Example of TreeMap(Map<? extends K,? extends V> m) Constructor.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        HashMap<Integer, String> hashMap = new HashMap<Integer, String>();

        hashMap.put(1, "Cat");
        hashMap.put(2, "Dog");
        hashMap.put(4, "Apple");
        hashMap.put(3, "Ball");

        System.out.println("hashMap : " + hashMap + "\n");

        /*
         * Constructs a new tree map containing the same mappings as the given
         * map, ordered according to the natural ordering of its keys. All keys
         * inserted into the new map must implement the Comparable interface.
         */

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>(hashMap);
        
        System.out.println("treeMap : " + treeMap + "\n");

    }
}

Output

hashMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

To Download TreeMapDemoConsAcceptsMap Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoConsAcceptsMap.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (ContainsValue)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of containsValue(Object value) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap +"\n");

        /*
         * Returns true if this map maps one or more keys to the specified
         * value.
         */
        boolean isValueExist = treeMap.containsValue("Ball");

        System.out.println("isValue 'Ball' Exist : " + isValueExist);

        isValueExist = treeMap.containsValue("Eagle");

        System.out.println("isValue 'Eagle' Exist : " + isValueExist);

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

isValue 'Ball' Exist : true
isValue 'Eagle' Exist : false

To Download TreeMapDemoContainsValue Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoContainsValue.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (ContainsKey)

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https://www.youtube.com/watch?v=PSftLa7dmCY&list=UUhwKlOVR041tngjerWxVccw

TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of containsKey(Object key) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap +"\n");

        /*
         * Returns true if this map contains a mapping for the specified key.
         */
        boolean isKeyExist = treeMap.containsKey(2);

        System.out.println("isKey '2' Exist : " + isKeyExist);

        isKeyExist = treeMap.containsKey(8);

        System.out.println("isKey '8' Exist : " + isKeyExist);

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

isKey '2' Exist : true
isKey '8' Exist : false

To Download TreeMapDemoContainsKey Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoContainsKey.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (Get)

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https://www.youtube.com/watch?v=VP537HT0rqw&list=UUhwKlOVR041tngjerWxVccw

TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of get(Object key) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap +"\n");

        /*
         * Returns the value to which the specified key is mapped, or null if
         * this map contains no mapping for the key.
         * 
         * A return value of null does not necessarily indicate that the map
         * contains no mapping for the key; it's also possible that the map
         * explicitly maps the key to null. The containsKey operation may be
         * used to distinguish these two cases.
         */
        String value = treeMap.get(2);

        System.out.println("value for the Key '2' : " + value);

        value = treeMap.get(10);

        System.out.println("value for the Key '10' : " + value);

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

value for the Key '2' : Dog
value for the Key '10' : null

To Download TreeMapDemoGet Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoGet.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (isEmpty)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of isEmpty() method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        System.out.println("treeMap : " + treeMap);

        /*
         * Returns true if this map contains no key-value mappings.
         */
        boolean isEmpty = treeMap.isEmpty();

        System.out.println("isEmpty : " + isEmpty + "\n");

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap );

        isEmpty = treeMap.isEmpty();

        System.out.println("isEmpty : " + isEmpty);

    }
}

Output

treeMap : {}
isEmpty : true

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}
isEmpty : false

To Download TreeMapDemoIsEmpty Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoIsEmpty.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (Size)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of size() method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

        /*
         * Returns the number of key-value mappings in this map.
         */
        int size = treeMap.size();

        System.out.println("size : " + size);

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

size : 4

To Download TreeMapDemoSize Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoSize.zip?attredirects=0&d=1

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Java : Collection Framework : TreeMap (Clear)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of clear() method.
 */
public class TreeMapExample
{
    public static void main(String[] args)
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

        /*
         * Removes all of the mappings from this map. The map will be empty
         * after this call returns.
         */
        treeMap.clear();

        System.out.println("treeMap : " + treeMap);

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

treeMap : {}

To Download TreeMapDemoClear Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoClear.zip?attredirects=0&d=1

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Java : Collection Framework : HashMap (Constructors Introduction)

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Java : Collection Framework : HashMap (Constructors Introduction) 

Java : Collection Framework : HashMap (Constructors Introduction) 

Java : Collection Framework : HashMap (Constructors Introduction) 

Java : Collection Framework : HashMap (Constructors Introduction) 

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Java : Collection Framework : TreeMap (Default Constructor)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of TreeMap() Constructor.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {
        /*
         * Constructs a new, empty tree map, using the natural ordering of its
         * keys. All keys inserted into the map must implement the Comparable
         * interface.
         */
        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(3, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(2, "Ball");
        

        System.out.println("treeMap : " + treeMap + "\n");

    }
}

Output

treeMap : {1=Cat, 2=Ball, 3=Dog, 4=Apple}

To Download TreeMapDemoDefaultCons Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoDefaultCons.zip?attredirects=0&d=1

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Java : Collection Framework : LinkedHashMap (EntrySet)

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LinkedHashMapExample.java

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

/*
 * Example of entrySet() method.
 */
public class LinkedHashMapExample
{
    public static void main(String[] args)
    {

        LinkedHashMap<Integer, String> linkedHashMap = new LinkedHashMap<Integer, String>();

        linkedHashMap.put(1, "Apple");
        linkedHashMap.put(3, "Cat");
        linkedHashMap.put(2, "Ball");

        System.out.println("linkedHashMap : " + linkedHashMap + "\n");

        /*
         * A map entry (key-value pair).
         * 
         * Returns a Set view of the mappings contained in this map.
         */
        Set<Map.Entry<Integer, String>> entrySet = linkedHashMap.entrySet();

        System.out.println("entrySet : " + entrySet + "\n");

        System.out.println("-----------------------");
        System.out.println("Key" + " | " + "value");
        System.out.println("-----------------------");

        for (Map.Entry<Integer, String> entry : entrySet)
        {
            System.out.println(entry.getKey() + "   | " + entry.getValue());
        }

    }
}

Output

linkedHashMap : {1=Apple, 3=Cat, 2=Ball}

entrySet : [1=Apple, 3=Cat, 2=Ball]

-----------------------
Key | value
-----------------------
1   | Apple
3   | Cat
2   | Ball

To Download LinkedHashMapDemoEntrySet Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/LinkedHashMapDemoEntrySet.zip?attredirects=0&d=1

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