Variable declaration with its name containing value from loop

Question

i am php developer just started at java i want to declare dynamic variables inside a loop and for that i have to append the loop value to varaible name this is what i want .

I would like to make  statement like this 

for (i=1; i<6; i++)
{
String new_variable_ + i;
}

the above code does not work in java how to do it ?

There's no dynamic variable in Java. Try using a HashMap or an ArrayList to hold your variables. — azgolfer
– azgolfer, Commented Jul 7, 2012 at 5:14
Why do you need such thing? However, you might do it via Reflection, though I am not sure. — Eng.Fouad
– Eng.Fouad, Commented Jul 7, 2012 at 5:20
I want it like that because there is another issue with java i didn't find any way of declaring associative arrays ... so i am bond declaring a variable ! — Shoaib Ahmed
– Shoaib Ahmed, Commented Jul 7, 2012 at 5:25

Shoaib · Accepted Answer · 2013-03-21 21:10:33Z

2

what you are trying to do is not possible in java ... this language is not that lose like php..its a type strict language

answered Mar 21, 2013 at 21:10

Shoaib

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Comments

Matt · Accepted Answer · 2012-07-07 06:20:14Z

2

Variable declarations are declared to be static identifiers and cannot contain any computed values in java (and i venture to say this would be true in any statically typed language).

You say you can't find an associative array. Have you seen the java.util.Map interface (and it's implementations)? It is by definition an associative array:

Wikipedia: In computer science, an associative array, map, or dictionary is an abstract data type composed of a collection of (key,value) pairs, such that each possible key appears at most once in the collection.

answered Jul 7, 2012 at 6:20

Matt

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Comments

azgolfer · Accepted Answer · 2012-07-07 05:22:01Z

-1

Like I said in the comment, there's no dynamic variable in Java. At best you can do this:

HashMap variableMap = new HashMap<String,String>();

for (int i = 1; i < 6; i++) {
   variableMap.put("new_variable_" + i, "some variable value");
}

Then to access them, you do:

String value = variableMap.get("new_variable_2");

Or to update it, you do:

variableMap.put("new_variable_2", "new value");

answered Jul 7, 2012 at 5:22

azgolfer

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Comments

jwismar · Accepted Answer · 2012-07-07 05:14:27Z

-2

If you just want to use a string version of i within the loop, you need:

for (int i=1; i<6; i++)
{
  String new_variable_ = "" + i;
  //use new_variable here.
}

If you're looking for something different, I'll need some more details. Good luck!

answered Jul 7, 2012 at 5:14

jwismar

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3 Comments

jwismar Over a year ago

Oh. You can't do that in Java.

Shoaib Ahmed Over a year ago

that sounds disturbing for a php developer :S

jwismar Over a year ago

Sorry! It's a strongly-typed language, not a dynamic language.

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