Question

why following code doesn’t compile ?

class aa1 <String> {
public void fun(){
String s = ""; // not compiling
}
}
class aa2 <String> {
String s = "";  // not compiling
}
class aa3 <String> {
String s = (String)""; // compiling
}

can some tell or give me link for this
thanks.

Answer 1

The generic parameter “String” hides the java.lang.String in this case.

in the class, if you declare the string s and specify its data type as “java.lang.String” then compiler won’t complain.

public class aa<String> {

    java.lang.String s = "" ;

}