How to show Hashmap value?

Question

I’m having trouble showing (can be using a for) the value of this Hashmap. Does anyone know how? The console only shows this value:

{Joao=[Ljava.lang.String;@2b05039f}

I can’t show the internal vector, the String[]:

HashMap<String, String[][]> hm = new HashMap<String,String[][]>();          
            hm.put("joao", new String[][]{
                    {"joao", "joao"}
            } );

What I want is to represent a data structure like this:

array
  0 => 
    array
      'input1' => 
        array 
          'pattern' => string '[\+]\d{2}[\(]\d{2}[\)]\d{4}[\-]\d{4}'
          'type' => string 'tel'
          'value' => string '[phone]'
  1 => 
    array
      'button1' => 
        array
          'pattern' => string '
          'type' => string 'button'
          'value' => string 'validate'

Answer 1

It was not clear, but in his example apparently there is always a Pattern, one type and a value. So why not create an object with these attributes?

public class Element {
    private String pattern, type, value;

    public Element(String pattern, String type, String value) {
        this.pattern = pattern;
        this.type = type;
        this.value = value;
    }

    // get, set
}

And then, instead of creating a monstrous structure of HashMap<String, HashMap<String, HashMap<... you would have a simple map of Element. For example:

// pattern, type, value
Element input = new Element("[\\+]\\d{2}[\\(]\\d{2}[\\)]\\d{4}[\\-]\\d{4}", "tel", "[phone]");
Element button  = new Element("", "button", "validate");

HashMap<String, Element> map = new HashMap(){{
    put("input1", input);
    put("button1", button);
}};

To go through that map, can use the interface Entry:

for(Entry<String, Element> each : map.entrySet()){

  // No caso, a 'key' é a String com o nome do elemento.
  System.out.println("Nome do elemento: " + each.getKey());

  // E o 'value' é o nosso objeto 'Element'.
  Element current = each.getValue();
  System.out.println("Pattern: " + current.getPattern());
  System.out.println("Type: " + current.getType());
  System.out.println("Value: " + current.getValue());
}

ouput:

Name of the element: input1
Pattern: [+]\d{2}[(]\d{2}[)]\d{4}[-]\d{4}
Type: tel
Value: [phone]

Name of the element: button1
Pattern:
Type: button
Value: validate

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_{Answer before the question is edited:}

You can use the method toString of Arrays:

System.out.println(Arrays.toString(hm.get("joao")));

output:

[10, 2015, 10101]

---

Or you can go through the array normally:

for(String each : hm.get("joao"))
    System.out.println(each);

output:

10
2015
10101