Re: Updating an object in a HashMap
Daniele Futtorovic wrote:
On 2008-02-14 04:36 +0100, alacrite@gmail.com allegedly wrote:
On Feb 13, 6:00 pm, alacr...@gmail.com wrote:
import java.util.HashMap;
import java.lang.System;;
public class HashMapTest
{
public static void main(String args[])
{
HashMap<String,Integer> hm = new
HashMap<String,Integer>();
hm.put("test1",0);
hm.get("test1").intValue() += 5;
//Error:The left-hand side of an assignment must be a
variable
System.out.println(hm.get("test1"));
}
}
I want to update a Value in a HashMap. I know the Key. I would have
assumed the above code would work. Instead, I am given an error, "The
left-hand side of an assignment must be a variable".
Does this mean that the value returned is the literal value? In this
case 0. I would have assume a reference to the object would have been
returned and calling += would have unboxed the Integer and aggregated
the value.
Could someone explain to me what is going on? Also, what is the best
way to accomplish updating this value?
Thanks.
Thank you all for your replies. I did not realize that Boolean, Byte,
Short, Character, Long,
Float, and Double objects were immutable.
This has NOTHING to do with immutable or not.
Two replies have stated this. Though their work-around was correct,
their reason was plain wrong.
It has NOTHING to do with immutability.
His original mistake had a great deal to do with his failure to
apprehend that immutability.
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