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how to get entryset from treemap in java?


TreeMap

TreeMap extends AbstractMap class and implements the NavigableMap interface. It contains the elements in key-value pair form. It maintains ascending order for its elements. It not allowed duplicate key.

Note: A TreeMap can have only one null key but can have multiple null values.

We can use entrySet() method to get entry set from treemap in java.

entrySet(): Returns a Set that contains the entries of this map. The set contains objects of type Map.Entry. It provides a set-view of this map.
Syntax: public Set entrySet().

Example

package com.codesjava;
 
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
 
public class Test {
  public static void main(String args[]){
	//Create TreeMap object.
	TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();
 
	//Add objects to the TreeMap.
	treeMap.put(4, "Roxy");
	treeMap.put(2, "Sunil");
	treeMap.put(5, "Sandy");
	treeMap.put(1, "Munish");
	treeMap.put(3, "Pardeep");
 
	//Print the TreeMap object.
	System.out.println("TreeMap elements:");
	System.out.println(treeMap);
 
	Set<Entry<Integer, String>> entires = treeMap.entrySet();
        for(Entry<Integer,String> entry:entires){
            System.out.println(entry.getKey()+" - "+entry.getValue());
        }
  }
}

Output

TreeMap elements:
TreeMap elements:
{1=Munish, 2=Sunil, 3=Pardeep, 4=Roxy, 5=Sandy}
1 - Munish
2 - Sunil
3 - Pardeep
4 - Roxy
5 - Sandy
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