CODEWITHSUNDEEP
javahashmap
user4436160
user4436160

Reputation:

Why HashMap of requestParameters returning hashcode value

I am trying to access my request parameters and it is returning hashcode value.what is the right way to access it.

 public String execute()
{
    Map<String, String[]> requestParams = request.getParameterMap();
    for (Map.Entry<String, String[]> entry : requestParams.entrySet())
    {
        System.out.println(entry.getKey() + "/" + entry.getValue());
    }
   return "success";
}

console output:

 userName/[Ljava.lang.String;@d206ca
 password/[Ljava.lang.String;@bbdd1f
 capacity1/[Ljava.lang.String;@1b249ae
 capacity2/[Ljava.lang.String;@37ced
 capacity3/[Ljava.lang.String;@fec020

Upvotes: 0

Views: 434

Answers (3)

Govinda Sakhare
Govinda Sakhare

Reputation: 5749

do it this way in for loop

 String s[]=entry.get(key)
 String value = ""+s[0]; //considering you have only one value

Upvotes: -1

wassgren
wassgren

Reputation: 19211

That is because the values are of type String[] that must be printed in the following way.

for (Map.Entry<String, String[]> entry : requestParams.entrySet()) {
    System.out.print("Key: " + entry.getKey() + ", values: ");
    for (String val : entry.getValue() {
        System.out.println(entry.getValue());
    }
}

Arrays does not override the toString-method in a nice fashion for printing. Therefore each element in the array must be printed.

A shorter version is to use one of the available utility functions from the Java library. E.g. the Arrays class that offers the following:

for (Map.Entry<String, String[]> entry : requestParams.entrySet()) {
    System.out.print("Key: " + entry.getKey() + ", values: " + Arrays.toString(entry.getValue()));
}

Or, if you are into Java 8 the following code will do it for you:

requestParams.entrySet().stream()
        .map(entry -> entry.getKey() + "/" + Arrays.toString(entry.getValue()))
        .forEach(System.out::println);

Edit: After input from the OP - this is actually what was requested.

Map<String, String[]> requestParams = new HashMap<>();
requestParams.put("username", new String[]{"foo"});

for (Map.Entry<String, String[]> entry : requestParams.entrySet()) {
    System.out.print(entry.getKey() + "/" + entry.getValue()[0]);
}

This is not a recommended approach since the getValue-method always returns an array which may be empty (and then an exception will occur). Furthermore, only one element will be printed but according to the OP it is not the case for the current request.

Upvotes: 3

Beri
Beri

Reputation: 11610

Try this:

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

entry value is an array, so you need to use Arrays to print it.

Upvotes: 2

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