How to get single value of an array if array is used as value corresponding to a key in HashMap?

Question

In the following code I'm using a String array as a HashMap value corresponding to a single key. The get() method of HashMap is returning the whole array. What if I want single value of array. (Say) I want only 'Lion' corresponding to key 'Animal'.

class HMTest{
  public static void main(String[] args){
     HashMap<String, String[]> subjects = new HashMap<String, String[]>();
     subjects.put("Fruit",new String[] {"mango","orange"});
     subjects.put("Animal",new String[] {"Lion","Tiger"});

     for(String s:subjects.get("Animal"))
       System.out.println(s);
     }
  }

I also tried replacing above for loop something like this

for(String[] s:subjects.get("Animal"))
       System.out.println(s[0]);

But its giving me error.

Anybody please help me out.

Maroun · Accepted Answer · 2013-11-12 08:26:55Z

4

Should be:

System.out.println(subjects.get("Animal")[0]);

The value of the "Animal" key is an array, not a String. Therefore, when you get("Animal"), you expect the value to be an array. Then you want to get the first element.

answered Nov 12, 2013 at 8:26

Maroun

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3 Comments

Rahul Over a year ago

The for is not at all required.

Winn Over a year ago

Thats what I also tried in for loop, but its giving me error saying incompatible type.

Maroun Over a year ago

@Winn Well.. don't use it in loop. Just wrote what I suggested.

Rahul · Accepted Answer · 2013-11-12 08:27:17Z

0

You don't need the for. The get() fetches a single value.

String[] s = subjects.get("Animal");
System.out.println(s[0]);

answered Nov 12, 2013 at 8:27

Rahul

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Comments

Mengjun · Accepted Answer · 2013-11-12 08:29:51Z

0

If you tried to use the following code:

  for(String[] s:subjects.get("Animal"))
     System.out.println(s[0]);

If it is working, then subjects.get("Animal") should be a type of String[][]. BUt in your code, it is a type of String[]. They are not matching..

Use System.out.println(subjects.get("Animal")[0]); to print the first element in array.

answered Nov 12, 2013 at 8:29

Mengjun

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Comments

Mehmet Sedat Güngör · Accepted Answer · 2013-11-12 08:30:07Z

0

Since the value of HashMap is a String array, just give the index of your desired value. Say, you want to see "Lion". Since its index is 0 at Animal array, you can say

System.out.println(subjects.get("Animal")[0]);

Output:

Lion

answered Nov 12, 2013 at 8:30

Mehmet Sedat Güngör

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