What's the error in this code?

Question

https://code.sololearn.com/chmD8yubh6ok/?ref=app

Answer 1

Mike

What when if condition will not execute?

Then program will return nothing.

Do this:

static <T> String Class(T o){
if (o instanceof Integer)
return "int";

return "xyz";
}

Answer 2

To see the result, you need to write a data output function:

public class Program
{
static int i = 1;
public static void main(String[] args) {
System.out.println(Class(i));
}
static <T> String Class(T o){
if (o instanceof Integer)
return "int";
else return "No Integer";
}
}

Answer 3

You can create a simple, generic solution like this:

public class TypeCheck {
public static void main(String[] args){
Object o = new Object();
int i = 1;
String s = "Hello world";
System.out.println(getClass(o));
System.out.println(getClass(i));
System.out.println(getClass(s));
}

public static String getClass(Object o){
return o.getClass().getSimpleName();
}
}

Output:
Object
Integer
String

The code is based off of this answer here: https://stackoverflow.com/a/26507980/16846240