put float into hashMap

[Marko Debac]

Hi,

what I need to do that I can put float value into hashMap, because hash map takes only integer or string value

HashMap<String, Integer>
HashMap<String, String>    

there is no

HashMap<String, Float>     

[Paul Sturrock]

Maps can take any Object, for both key and value. So:

Map<String, Float> map = new HashMap<String, Float>();

is perfectly valid.

[Lorenz Baylon]

Hi Marko,

Paul is right, however in Java 5, with autoboxing feature, a HashMap can take say a primitive key and a primitive value(e.g HashMap<int,float> , JVM in turn does the autoboxing behind the scenes for you.

Goodluck
[ June 04, 2007: Message edited by: lhorenz baylon ]

[Jesper de Jong]

Originally posted by lhorenz baylon:
Hi Marko,

...(e.g HashMap<int,float> , JVM in turn does the autoboxing behind the scenes for you.

Note, you can't write HashMap<int, float>, that will result in a compiler error. The things between the angle brackets cannot be primitive types. Hoewever, you can make a HashMap<Integer, Float> and Java 5 autoboxing:

Map<Integer, Float> map = new HashMap<Integer, Float>();
 
// Note: You don't need to convert the literals to an Integer or Float yourself;
// autoboxing takes care of that.
map.put(23, 2.5f);
map.put(64, 4.83f);
 
// Likewise when looking up a value.
float value = map.get(23);

[Lorenz Baylon]

oh yes, my bad, sorry and thanks