Foreach method in Java 8

This blog post is about foreach method in Java 8. This method is used to iterate over collections. The main use I found in this method is to iterate maps in Java.

The normal syntax used in iterating a map in Java is as follows:

for (Map.Entry<String, String> entry : usStates.entrySet()) 

Here 'usStates' is the name of the map. This syntax is slightly difficult to remember. Using foreach method, we can iterate the map as follows;

 usStates.forEach((k,v)->{     //Easy to iterate the map

This is explained in a program as shown below:

import java.util.HashMap;
import java.util.Map;

public class ForEachMap {

  public static void main(String a[]) {
   
         Map<String, String> usStates = new HashMap<>();
         usStates.put("California", "Sacramento");
         usStates.put("Kansas", "Topeka");
         usStates.put("New York", "Albany");
         usStates.put("Pennsylvania", "Harrisburg");
         usStates.put("Florida", "Tallahassee");
  
         // iterating the Map through normal method.
System.out.println("***Iterating the map through normal method***\n"); 
         for (Map.Entry<String, String> entry : usStates.entrySet()) {
          
          System.out.print("US State : " + entry.getKey()); 
          System.out.print("\tCapital : " + entry.getValue());
          System.out.println();
         }
  
         // iterate through Map using forEach method
System.out.println("\n\n***Iterating the map through foreach method***\n"); 
         
         usStates.forEach((k,v)->{     //Easy to iterate the map
          
          System.out.print("US State : " + k); 
          System.out.print("\tCapital : " + v);
          System.out.println();
         });
     }
}

The output of the program is as follows:

***Iterating the map through normal method***

US State : New York Capital : Albany
US State : California Capital : Sacramento
US State : Kansas Capital : Topeka
US State : Florida Capital : Tallahassee
US State : Pennsylvania Capital : Harrisburg


***Iterating the map through foreach method***

US State : New York Capital : Albany
US State : California Capital : Sacramento
US State : Kansas Capital : Topeka
US State : Florida Capital : Tallahassee
US State : Pennsylvania Capital : Harrisburg