单项选择题

public static void main(String[]args){
Integer i=new Integer(1)+new Integer(2);
switch(i){
case3:System.out.println("three");break;
default:System.out.println("other");break;
}
}
Whatistheresult?()

A.three
B.other
C.Anexceptionisthrownatruntime.
D.Compilationfailsbecauseofanerroronline12.
E.Compilationfailsbecauseofanerroronline13.
F.Compilationfailsbecauseofanerroronline15.