How to store double variable in hash map

i need to store double variable using hash map, but i cant able to store it
my jsp coding contains
double et=24,j=5;
hm.put("stm",st);
hm.put("etm",et);
Generated servlet error
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\exam\org\apache\jsp\availability_jsp.java:752:
put(java.lang.Object,java.lang.Object) in java.util.Map cannot be applied to (java.lang.String,double)
hm.put("stm",st);
^
how to overcome this problem
thank u in advance

double etme;
etme = hm.getDouble("etm");
i'm getting this error
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\exam\org\apache\jsp\editdel_jsp.java:85: cannot resolve symbol
symbol : method getDouble (java.lang.String)
location: interface java.util.Map
etme = hm.getDouble("etm");
^
how to solve it
plz help me

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