how to iterate a map in java using for each

Hi,

I have a HashMap in Java and there is need to iterate all the items.

how to iterate a map in java using for each?

Thanks

View Answers

February 13, 2020 at 3:39 AM

Hi,

This example is using the stream of Java 8:

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

public class MapIterate {

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("1", "One");
        map.put("2", "Two");
        map.put("3", "Three");
        map.put("4", "Four");
        map.put("5", "Five");
        map.put("6", "Six");
        map.put("7", "Seven");
        map.put("8", "Eight");
        map.put("9", "Nine");
        map.put("10", "Ten");

        map.forEach((key, value) -> System.out.println("Key:" + key + ", Value:" + value));


    }

}

and output will be:

Key:1, Value:One
Key:2, Value:Two
Key:3, Value:Three
Key:4, Value:Four
Key:5, Value:Five
Key:6, Value:Six
Key:7, Value:Seven
Key:8, Value:Eight
Key:9, Value:Nine
Key:10, Value:Ten

Thanks

February 13, 2020 at 5:32 AM

Hi,

It can be also iterated like this:

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

public class MapIterate {

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("1", "One");
        map.put("2", "Two");
        map.put("3", "Three");
        map.put("4", "Four");
        map.put("5", "Five");
        map.put("6", "Six");
        map.put("7", "Seven");
        map.put("8", "Eight");
        map.put("9", "Nine");
        map.put("10", "Ten");

        map.forEach((key, value) -> {
            System.out.println("Key: " + key + ", Value : " + value);
        });

    }

}

Thanks

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