How do I efficiently iterate over each entry in a Java Map

Question

My question is to know what is the most effective way of going through the map if I have an object implementing the Map interface in Java? If I wish to iterate over every pair contained within it, how do I go through the map? Is there any difference when the ordering of elements depends on the specific map implementation which I have for the interface?

Answer 1

To answer your questions, use the following line of code:-

 

Map<String, String> map = ... 
for (Map.Entry<String, String> entry : map.entrySet()) { 
System.out.println(entry.getKey() + "/" + entry.getValue()); 

}

On Java 10+:

for (var entry : map.entrySet()) { 

       System.out.println(entry.getKey() + "/" + entry.getValue()); 
}