java - private static final String not doing its job -

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i have implemented global private static final string key this: 

private static final string key_stufe = "stufe";

to use easypreferences.

when type hardcoded string 

int abc = prefs.getint("mykey", 1);

the code works fine.

but when use global key: 

int abc = prefs.getint(key_stufe, 1);

java.lang.classcastexception: java.lang.string cannot cast java.lang.integer

i not error. global key defined string , functions expects string. fine good. why such error?

from documentation of getint method:

throws classcastexception if there preference name not int.

this happens here, key "stufe" not have int value associated.


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