java - Hashtable of type <String,String> is storing <String, Integer> type value as I see in the log cat and debugger. Is it possible? -

this first question posting here. since guys have answered many question , find answers, stackoverflow. being specific problem- have static hastable type <string,string>. when setting values , key other activity, in specific case(i not sure of case) hastable having data of type <string, integer>. checked in debugger showing same. mistake have made can please me pointing issues? thanks.

edit code-

       hashtable<string,string> details;         details= new hashtable<>();         hashtable temp;         temp = details;         temp.put("key1", new integer("1"));         temp.put("key2", "1");         log.d("details", details.get("key1"));//causes classcastexception: java.lang.integer cannot cast java.lang.string         log.d("temp",temp.get("key1").tostring());//no issue ,worked 

can hashtable of type <string,string> contains value of type <string, integer>

yes possible. actual runtime typing hashtable uses object key , value types. (for longer explanation google "java type erasure" ...)

for example, when write this:

 hashtable<string, string> tab = new hashtable<>();  tab.put("a", "b");  string res = tab.get("a"); 

the last statement doing under covers:

 string res = (string) tab.get("a"); 

if have played rules, typecast can never fail.

what mistake have made can please me pointing issues?

without seeing code can guess, 1 possible explanation have ignored (or suppressed) critical "unchecked conversion" warning or similar. example:

 hashtable<string, integer> tab = new hashtable<>();  tab.put("a", new integer(42));   // unchecked conversion  hashtable<string, string> bad = (hashtable<string, string>) tab;   string res = bad.get("a");    // ooops! 

you should never ignore compiler warnings. safe suppress them, need understand mean make judgement. if suppress them without due consideration, liable write buggy code throws classcastexception in unexpected places.