How to create generic constructor?

It is also possible for constructor to be generic, even if their class is not.
Example:
class demo
{
private int i;
demo(T i){this.i=i;}
void showi(){System.out.println(i);}
public static void main(String[] args){
demo d1=new demo(new Integer(5));
d1.showi();
demo d2=new demo(new Integer(10));
d2.showi();
}};

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