replace array value with hashmap values

Question

        HashMap<String, String> apos = new HashMap<String, String>();
        apos.put("i'm","I am");
        apos.put("can't","cannot");
        apos.put("couldn't","could not");
        String[] st = new String[]{"i'm","johny"};
        Iterator itr = apos.entrySet().iterator();
        for (int i = 0; i < st.length; i++) {
            while((itr).hasNext()) {
                if (itr.equals(st[i]))
                {
                    st[i].replace(st[i],??????(value of the matched key))
                }   
            }

            }

I want to compare a string with hashmap and rerplace a word with hashmap value if it matches with its key. Above is what i am trying to do. Could anyone will please help me what i should write in place of key.

Help will be appreciated. Thanks

Rohit Jain · Accepted Answer · 2013-09-24 18:08:14Z

2

You don't need to iterate over the map to find out whether an array value is a key in map. Use Map#containsKey() method for that. So, get rid of that iterator.
```
if (map.containsKey(s[i]))
```
You don't need a replace at all. You can simply assign a new value to an array index using = operator.
```
s[i] = newValue;
```
To get the value from the map for a particular key to set in the array, use Map#get(Object) method.
```
map.get(s[i]);
```

edited Sep 24, 2013 at 18:08

answered Sep 24, 2013 at 17:25

Rohit Jain

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3 Comments

Explorer Over a year ago

Thanks @Rohit for replying... I tried this : for (int i = 0; i < st.length; i++) { while(apos.containsKey(s[i])) { s[i]=s[i].replace(s[i],apos.get(s[i])); } System.out.println(s[i]); } and i am getting desired result but i did't got your 2nd point, could you please elaborate it. Thanks a ton.

Rohit Jain Over a year ago

@user2805482. That is not really related to your question, as I see now. I'll remove it. But just for explanation, since String are immutable, replacing anything in a String will give you a new String. It doesn't do a in-place replacement.

Rohit Jain Over a year ago

In your current code: change s[i]=s[i].replace(s[i],apos.get(s[i])); to s[i] = apos.get(s[i]);. That was my 3rd point. And change your while(apos.containsKey()) to if (apos.containsKey()), else it will be an infinite loop.

Trey Jonn · Accepted Answer · 2013-09-24 17:30:41Z

0

Try this out: Instead of st[i].replace(st[i],??????(value of the matched key))

use

   if(st[i].equals((String)itr.getKey()))
     st[i] = (String)itr.getValue();

Refer to this tutorial for usage details.

answered Sep 24, 2013 at 17:30

Trey Jonn

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