Question

How to combine all keys and values from a map into a single string in Java

Answer 1

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

public class CombineKeysAndValues {
    // Function to combine keys and values into a single string
    public static String combineKeysAndValues(Map<String, String> map) {
        StringBuilder combinedString = new StringBuilder();

        for (Map.Entry<String, String> entry : map.entrySet()) {
            combinedString.append(entry.getKey())
                          .append("=")
                          .append(entry.getValue())
                          .append(", ");
        }

        // Remove the trailing comma and space
        if (combinedString.length() > 0) {
            combinedString.setLength(combinedString.length() - 2);
        }

        return combinedString.toString();
    }

    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("Key1", "Value1");
        map.put("Key2", "Value2");
        map.put("Key3", "Value3");
        map.put("Key4", "Value4");

        String result = combineKeysAndValues(map);


        System.out.println("Combined keys and values: " + result);
    }
}

 
 
/*
run:
 
Combined keys and values: Key2=Value2, Key1=Value1, Key4=Value4, Key3=Value3
 
*/

 

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