import java.util.HashMap;

import java.util.Map;

public class ParameterComparator {

/**

* Compares values of URL parameters.

*

* @param paramsMap A map containing URL parameters and their values.

* @param comparisonParamsMap A map containing URL parameters to compare against.

* @return A map containing the differences found, where keys are parameters

* and values are a string describing the difference (or null if no difference).

*/

public static Map<String, String> compareParameters(Map<String, String> paramsMap, Map<String, String> comparisonParamsMap) {

Map<String, String> differences = new HashMap<>();

if (paramsMap == null || comparisonParamsMap == null) {

return differences; // Return empty map for null inputs

}

for (Map.Entry<String, String> comparisonEntry : comparisonParamsMap.entrySet()) {

String parameterName = comparisonEntry.getKey();

String comparisonValue = comparisonEntry.getValue();

String actualValue = paramsMap.get(parameterName);

if (actualValue == null) {

differences.put(parameterName, "Parameter '" + parameterName + "' is missing.");

} else if (!actualValue.equals(comparisonValue)) {

differences.put(parameterName, "Value differs: " + actualValue + " vs " + comparisonValue);

}

}

return differences;

}

public static void main(String[] args) {

// Example Usage (for testing)

Map<String, String> params1 = new HashMap<>();

params1.put("param1", "value1");

params1.put("param2", "value2");

params1.put("param3", "value3");

Map<String, String> params2 = new HashMap<>();

params2.put("param1", "value1");

params2.put("param2", "value4");

params2.put("param4", "value4"); //param4 is only in the comparison map

Map<String,String> diff = compareParameters(params1, params2);

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

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

}

}

}