How to use Java TreeMap with Examples

[no_toc]
In the tutorial, Grokonez introduces about Java TreeMap and how to use it by examples:
– Explore Java TreeMap’s hierarchy.
– Do examples with Java TreeMap method APIs

Let’s start with more details!

Related posts:
– How to use Java PriorityQueue with Examples

Java TreeMap

public class TreeMap
	extends AbstractMap
		implements NavigableMap, Cloneable, Serializable
		
public interface NavigableMap
	extends SortedMap

– Java TreeMap extends AbstractMap class and implements NavigableMap interface. Here is Java TreeMap hierarchy:

– Java TreeMap use a Red-Black tree based NavigableMap implementation.

– Java TreeMap is sorted according to the natural ordering of its keys, or by a Comparator provided at map creation time, depending on which constructor is used.

– Java TreeMap provides guaranteed log(n) time cost for the containsKey, get, put and remove operations.

– Java TreeMap’s implementation is not synchronized. If multiple threads access a map concurrently, and at least one of the threads modifies the map structurally, it must be synchronized externally.

SortedMap m = Collections.synchronizedSortedMap(new TreeMap(...));

– Java TreeMap has all the functionalities of SortedMap and NavigableMap interface. A SortedMap extended with navigation methods returning the closest matches for given search targets:

+ Methods lowerEntry, floorEntry, ceilingEntry, and higherEntry return Map.Entry objects associated with keys respectively less than, less than or equal, greater than or equal, and greater than a given key, returning null if there is no such key.
+ Methods lowerKey, floorKey, ceilingKey, and higherKey return only the associated keys
+ Methods firstEntry, pollFirstEntry, lastEntry, and pollLastEntry that return and/or remove the least and greatest mappings, if any exist, else returning null.

– Java TreeMap cannot contain duplicate keys; each key can map to at most one value.

– Java TreeMap cannot contain the null key. BUT It can have null values.

Construct Java TreeMap

Setup for Examples

– Create 2 classes KeyInfo and Employee:

class KeyInfo{
	Integer id;
	String name;
	
	public KeyInfo(Integer id, String name) {
		this.id = id;
		this.name = name;
	}
	
	public int getId() {
		return this.id;
	}
	
	public String getName() {
		return this.name;
	}
	
	public String toString() {
		return String.format("[id = %d, name = %s]", id, name);
	}
}

class Employee{
	Integer id;
	String name;
	Double salary;
	String city;
	
	public Employee(Integer id, String name, Double salary, String city){
		this.id = id;
		this.name = name;
		this.salary = salary;
		this.city = city;
	}
	
	public int getId() {
		return this.id;
	}
	
	public String getName() {
		return this.name;
	}
	
	public Double getSalary() {
		return this.salary;
	}
	
	public String getCity() {
		return this.city;
	}
	
	public String toString() {
		return String.format("[id = %d, name = %s, salary = %.2f, city = %s]", id, name, salary, city);
	}
}

1. TreeMap() Constructor

Detail:

public TreeMap()

– Constructs a new, empty Java Tree Map, using the natural ordering of its keys.
– All keys inserted into the map must implement the Comparable interface.

Example:

Map 	numberMap = new TreeMap();

numberMap.put(1, "one");
numberMap.put(9, "nine");
numberMap.put(5, "five");
numberMap.put(2, "two");
numberMap.put(7, "seven");
numberMap.put(4, "four");

System.out.println(numberMap);

-> Output:

{1=one, 2=two, 4=four, 5=five, 7=seven, 9=nine}

Java TreeMap with Comparable Object Keys

Add Comparable interface to KeyInfo class:

class KeyInfo implements Comparable{
	...
	
	@Override
	public int compareTo(KeyInfo o) {
		if(id == o.id)  
			return 0;  
		else if(id > o.id)  
			return 1;  
		else
			return -1; 
	}

	...
}

– Create Java TreeMap Example:

Map employeeMap = new TreeMap();

employeeMap.put(new KeyInfo(1, "Jack"), new Employee(1, "Jack", 6000.0, "Fall River"));
employeeMap.put(new KeyInfo(4, "Joe"), new Employee(4, "Joe", 7000.0, "Wilmington"));
employeeMap.put(new KeyInfo(10, "Davis"), new Employee(10, "Davis", 6500.0, "Hammond"));
employeeMap.put(new KeyInfo(7, "Mary"), new Employee(6, "Mary", 5700.0, "Duluth"));
employeeMap.put(new KeyInfo(9, "Jane"), new Employee(8, "Jane", 8000.0, "Albany"));
employeeMap.put(new KeyInfo(3, "Harry"), new Employee(3, "Harry", 6800.0, "Parma"));

System.out.println(employeeMap);

-> Output:

//	{	
//		[id = 1, name = Jack]=[id = 1, name = Jack, salary = 6000,00, city = Fall River], 
// 		[id = 3, name = Harry]=[id = 3, name = Harry, salary = 6800,00, city = Parma], 
//		[id = 4, name = Joe]=[id = 4, name = Joe, salary = 7000,00, city = Wilmington], 
//		[id = 7, name = Mary]=[id = 6, name = Mary, salary = 5700,00, city = Duluth], 
//		[id = 9, name = Jane]=[id = 8, name = Jane, salary = 8000,00, city = Albany], 
//		[id = 10, name = Davis]=[id = 10, name = Davis, salary = 6500,00, city = Hammond]
//	}

2. TreeMap(comparator) Constructor

Detail:

public TreeMap(Comparator comparator)

– Constructs a new, empty tree map, ordered according to the given comparator.
– All keys inserted into the map must be mutually comparable by the given comparator.
– The comparator that will be used to order this map. If null, the natural ordering of the keys will be used.

Example: reverse order of entries

Map 	numberMap = new TreeMap(Comparator.reverseOrder());

numberMap.put(1, "one");
numberMap.put(9, "nine");
numberMap.put(5, "five");
numberMap.put(2, "two");
numberMap.put(7, "seven");
numberMap.put(4, "four");

System.out.println(numberMap);

-> Output:

// {9=nine, 7=seven, 5=five, 4=four, 2=two, 1=one}

Create Java TreeMap Example with Object Keys using Comparator

– Implement Comparator class in Java TreeMap constructor:

Map employeeMap = new TreeMap(new Comparator() {

	@Override
	public int compare(KeyInfo o1, KeyInfo o2) {
		if (o1.id == o2.id) 
		    return 0; 
		else if(o1.id < o2.id)
			return 1;
		else 
			return -1;
	}
});

- Add entries to the TreeMap:

employeeMap.put(new KeyInfo(1, "Jack"), new Employee(1, "Jack", 6000.0, "Fall River"));
employeeMap.put(new KeyInfo(4, "Joe"), new Employee(4, "Joe", 7000.0, "Wilmington"));
employeeMap.put(new KeyInfo(10, "Davis"), new Employee(10, "Davis", 6500.0, "Hammond"));
employeeMap.put(new KeyInfo(7, "Mary"), new Employee(6, "Mary", 5700.0, "Duluth"));
employeeMap.put(new KeyInfo(9, "Jane"), new Employee(8, "Jane", 8000.0, "Albany"));
employeeMap.put(new KeyInfo(3, "Harry"), new Employee(3, "Harry", 6800.0, "Parma"));

System.out.println(employeeMap);

-> Output:

//	{
//		[id = 10, name = Davis]=[id = 10, name = Davis, salary = 6500,00, city = Hammond], 
//		[id = 9, name = Jane]=[id = 8, name = Jane, salary = 8000,00, city = Albany], 
//		[id = 7, name = Mary]=[id = 6, name = Mary, salary = 5700,00, city = Duluth], 
//		[id = 4, name = Joe]=[id = 4, name = Joe, salary = 7000,00, city = Wilmington], 
//		[id = 3, name = Harry]=[id = 3, name = Harry, salary = 6800,00, city = Parma], 
//		[id = 1, name = Jack]=[id = 1, name = Jack, salary = 6000,00, city = Fall River]
//	}

3. TreeMap(Map m) Constructor

Detail:

public TreeMap(Map m)

- 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.
- BigO = n*log(n) time.

Example:

- Add Comparable to KeyInfo:

class KeyInfo implements Comparable{
	...

	@Override
	public int compareTo(KeyInfo o) {
		if(id == o.id)  
			return 0;  
		else if(id > o.id)  
			return 1;  
		else
			return -1; 
	}
	
	...
}

- Create a Java TreeMap:

Map employeeMap = new TreeMap(new HashMap() {
	{
		put(new KeyInfo(1, "Jack"), new Employee(1, "Jack", 6000.0, "Fall River"));
		put(new KeyInfo(4, "Joe"), new Employee(4, "Joe", 7000.0, "Wilmington"));
		put(new KeyInfo(10, "Davis"), new Employee(10, "Davis", 6500.0, "Hammond"));
		put(new KeyInfo(7, "Mary"), new Employee(6, "Mary", 5700.0, "Duluth"));
		put(new KeyInfo(9, "Jane"), new Employee(8, "Jane", 8000.0, "Albany"));
		put(new KeyInfo(3, "Harry"), new Employee(3, "Harry", 6800.0, "Parma"));
	}
});

System.out.println(employeeMap);

-> Output:

//	{
//		[id = 10, name = Davis]=[id = 10, name = Davis, salary = 6500,00, city = Hammond], 
//		[id = 9, name = Jane]=[id = 8, name = Jane, salary = 8000,00, city = Albany], 
//		[id = 7, name = Mary]=[id = 6, name = Mary, salary = 5700,00, city = Duluth], 
//		[id = 4, name = Joe]=[id = 4, name = Joe, salary = 7000,00, city = Wilmington], 
//		[id = 3, name = Harry]=[id = 3, name = Harry, salary = 6800,00, city = Parma], 
//		[id = 1, name = Jack]=[id = 1, name = Jack, salary = 6000,00, city = Fall River]
//	}

4. TreeMap(SortedMap m) Constructor

Detail:

public TreeMap(SortedMap m)

- Constructs a new tree map containing the same mappings and using the same ordering as the specified sorted map.
- This method runs in linear time.

Example:

+ Create SortedMap:

SortedMap sortedMap = new TreeMap();

sortedMap.put(new KeyInfo(1, "Jack"), new Employee(1, "Jack", 6000.0, "Fall River"));
sortedMap.put(new KeyInfo(4, "Joe"), new Employee(4, "Joe", 7000.0, "Wilmington"));
sortedMap.put(new KeyInfo(10, "Davis"), new Employee(10, "Davis", 6500.0, "Hammond"));
sortedMap.put(new KeyInfo(7, "Mary"), new Employee(6, "Mary", 5700.0, "Duluth"));
sortedMap.put(new KeyInfo(9, "Jane"), new Employee(8, "Jane", 8000.0, "Albany"));
sortedMap.put(new KeyInfo(3, "Harry"), new Employee(3, "Harry", 6800.0, "Parma"));

+ Then init a Java TreeMap:

Map newEmployeesMap = new TreeMap(sortedMap);

System.out.println(newEmployeesMap);

-> Output:

//	{	
//		[id = 1, name = Jack]=[id = 1, name = Jack, salary = 6000,00, city = Fall River], 
// 		[id = 3, name = Harry]=[id = 3, name = Harry, salary = 6800,00, city = Parma], 
//		[id = 4, name = Joe]=[id = 4, name = Joe, salary = 7000,00, city = Wilmington], 
//		[id = 7, name = Mary]=[id = 6, name = Mary, salary = 5700,00, city = Duluth], 
//		[id = 9, name = Jane]=[id = 8, name = Jane, salary = 8000,00, city = Albany], 
//		[id = 10, name = Davis]=[id = 10, name = Davis, salary = 6500,00, city = Hammond]
//	}

Find/Search Key-Value Pair in Java TreeMap

Following the example, We use a set of TreeMap functionalities:

- ceilingEntry(K key):
-> returns a key-value mapping associated with the least key greater than or equal to the given key, or null if there is no such key.

- ceilingKey(K key):
-> returns the least key greater than or equal to the given key, or null if there is no such key.

- containsKey(Object key):
-> returns true if this map contains a mapping for the specified key.

- containsValue(Object value):
-> returns true if this map maps one or more keys to the specified value.

- firstEntry():
-> returns a key-value mapping associated with the least key in this map, or null if the map is empty.

- firstKey():
-> returns the first (lowest) key currently in this map.

- floorEntry(K key):
-> returns a key-value mapping associated with the greatest key less than or equal to the given key, or null if there is no such key.

- floorKey(K key):
-> returns the greatest key less than or equal to the given key, or null if there is no such key.

- get(Object key):
-> returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

- lastEntry():
-> Returns a key-value mapping associated with the greatest key in this map, or null if the map is empty.

- lastKey():
-> Returns the last (highest) key currently in this map.

- lowerEntry(K key):
-> Returns a key-value mapping associated with the greatest key strictly less than the given key, or null if there is no such key.

- lowerKey(K key):
-> Returns the greatest key strictly less than the given key, or null if there is no such key.

Example:

TreeMap numberMap = new TreeMap();

numberMap.put(1, "one");
numberMap.put(9, "nine");
numberMap.put(5, "five");
numberMap.put(2, "two");
numberMap.put(7, "seven");
numberMap.put(4, "four");

Entry keyValue = numberMap.ceilingEntry(6);
System.out.println(keyValue); // 7=seven

Integer key = numberMap.ceilingKey(6);
System.out.println(key); // 7

boolean c =numberMap.containsKey(6);
System.out.println(c); // false

c = numberMap.containsValue("seven");
System.out.println(c); // true

keyValue = numberMap.firstEntry();
System.out.println(keyValue); // 1=one

Integer firstKey = numberMap.firstKey();
System.out.println(firstKey); // 1

keyValue = numberMap.floorEntry(6);
System.out.println(keyValue); // 5=five

key = numberMap.floorKey(6);
System.out.println(key); // 5

String value = numberMap.get(5);
System.out.println(value); // five

keyValue = numberMap.lastEntry();
System.out.println(keyValue); // 9=nine

key = numberMap.lastKey();
System.out.println(key); // 9

keyValue = numberMap.lowerEntry(9);
System.out.println(keyValue); // 7=seven

key = numberMap.lowerKey(9);
System.out.println(key); // 7

Modify/Remove Entries of Java TreeMap

List of method APIs to modify and remove entries of Java TreeMap Collection:

- pollFirstEntry(): Removes and returns a key-value mapping associated with the least key in this map, or null if the map is empty.
- pollLastEntry(): Removes and returns a key-value mapping associated with the greatest key in this map, or null if the map is empty.
- put(K key, V value): Associates the specified value with the specified key in this map.
- putAll(Map map): Copies all of the mappings from the specified map to this map.

Example:

TreeMap numberMap = new TreeMap();

numberMap.put(1, "one");
numberMap.put(9, "nine");
numberMap.put(5, "five");
numberMap.put(2, "two");
numberMap.put(7, "seven");
numberMap.put(4, "four");

numberMap.pollFirstEntry();

System.out.println(numberMap); 
// {2=two, 4=four, 5=five, 7=seven, 9=nine}

numberMap.pollLastEntry();

System.out.println(numberMap);
// {2=two, 4=four, 5=five, 7=seven}

numberMap.put(2, "TWO");

System.out.println(numberMap);
// {2=TWO, 4=four, 5=five, 7=seven}

TreeMap addingNumberMap = new TreeMap();
addingNumberMap.put(10, "ten");
addingNumberMap.put(11, "eleven");

numberMap.putAll(addingNumberMap);

System.out.println(numberMap);
// {2=TWO, 4=four, 5=five, 7=seven, 10=ten, 11=eleven}

Getting a View of Java TreeMap

List of method APIs to get a view portion of Java TreeMap:

- descendingKeySet():
-> Returns a reverse order NavigableSet view of the keys contained in this map.

- descendingMap():
-> Returns a Set view of the mappings contained in this map.

- headMap(K toKey):
-> Returns a view of the portion of this map whose keys are strictly less than toKey.

- headMap(K toKey, boolean inclusive):
-> Returns a view of the portion of this map whose keys are less than (or equal to, if inclusive is true) toKey.

- subMap(K fromKey, boolean fromInclusive, K toKey, boolean toInclusive):
-> Returns a view of the portion of this map whose keys range from fromKey to toKey.

- subMap(K fromKey, K toKey):
-> Returns a view of the portion of this map whose keys range from fromKey, inclusive, to toKey, exclusive.

- tailMap(K fromKey):
-> Returns a view of the portion of this map whose keys are greater than or equal to fromKey.

- tailMap(K fromKey, boolean inclusive)
-> Returns a view of the portion of this map whose keys are greater than (or equal to, if inclusive is true) fromKey.

- values():
-> Returns a Collection view of the values contained in this map.

Example:

TreeMap numberMap = new TreeMap();

numberMap.put(1, "one");
numberMap.put(9, "nine");
numberMap.put(5, "five");
numberMap.put(2, "two");
numberMap.put(7, "seven");
numberMap.put(4, "four");

NavigableSet descendingKeySet = numberMap.descendingKeySet();
System.out.println(descendingKeySet);
// [9, 7, 5, 4, 2, 1]

NavigableMap descendingMap = numberMap.descendingMap();
System.out.println(descendingMap);
// {9=nine, 7=seven, 5=five, 4=four, 2=two, 1=one}

SortedMap headMap = numberMap.headMap(9);
System.out.println(headMap);
// {1=one, 2=two, 4=four, 5=five, 7=seven}

NavigableMap subMap = numberMap.subMap(2, false, 9, true);
System.out.println(subMap);
// {4=four, 5=five, 7=seven, 9=nine}

SortedMap tailMap = numberMap.tailMap(5);
System.out.println(tailMap);
// {5=five, 7=seven, 9=nine}

tailMap = numberMap.tailMap(5, false);
System.out.println(tailMap);
// {7=seven, 9=nine}

Collection values = numberMap.values();
System.out.println(values);
// [one, two, four, five, seven, nine]

Conclusion

We had learned how to use Java TreeMap by examples:

Explore Java TreeMap hierarchy.
How to construct Java TreeMap with difference constructors.
Create Java TreeMap and through almost Java TreeMap's method APIs.

Happy Learning! See you later!

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Java TreeMap

Construct Java TreeMap

Setup for Examples

1. TreeMap() Constructor

Java TreeMap with Comparable Object Keys

2. TreeMap(comparator) Constructor

Create Java TreeMap Example with Object Keys using Comparator

3. TreeMap(Map m) Constructor

4. TreeMap(SortedMap m) Constructor

Find/Search Key-Value Pair in Java TreeMap

Modify/Remove Entries of Java TreeMap

Getting a View of Java TreeMap

Conclusion

126 thoughts on “How to use Java TreeMap with Examples”

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