why isnt it working?

Question

as you can see I am trying to get the input from the constructor , but its not giving me it.
how can I make it work?
code:

import java.util.*;
public class Main
{
public static void main(String[] args) {

User u1 = new User("Jerry" , 14);
u1.getDetail();
u1.getDetail2();

}
}

class User <T>{

T t1;
T t2;

public User(T t1 , T t2) {
this.t1 = t1;
this.t2 = t2;
}

public T getDetail(){
return t1;
}

public T getDetail2(){
return t2;
}

}

Answer 1

I don't undaerstan what and why that T?
See below, i have made some changes it is working:

import java.util.*;
public class Main
{
public static void main(String[] args) {

User u1 = new User("Jerry" , 14);
System.out.println(u1.getDetail());
System.out.println(u1.getDetail2());

}
}

class User{

String t1;
int t2;

public User(String t1 , int t2) {
this.t1 = t1;
this.t2 = t2;
}

public String getDetail(){
return t1;
}

public int getDetail2(){
return t2;
}

}

Answer 2

You are not printing returned results...

Make these changes... yahel
System.out.println(u1.getDetail());
System.out.println(u1.getDetail2());

Answer 3

yahel read the comments for reasons...
You're welcome....

Note : but actually there no need of generics as you type casting all to Object type only, not to specific type.
Practical purpose it's fine.

Answer 4

Muhammadamin the T is a generic class.

Answer 5

Jayakrishna🇮🇳 I am printing them... look at the main method

Answer 6

yahel your only calling methods, but not catching returned values.. Try with changes of statements I posted above and see difference...

Answer 7

Jayakrishna🇮🇳 I did do it, look at lines 7-8

Answer 8

//ohh.. yahel try to understand what is saying by checking in playground.. You can understand it.

import java.util.*;
public class Main
{
public static void main(String[] args) {

User u1 = new User("Jerry" , 14);
u1.getDetail();
u1.getDetail2(); //here you missing return values so no output..

//this statements just calls your methods ,and posibke get returned results. But you need to catch it by storing or printing...
//by these ways:
String str = (String)u1.getDetail();
System.out.println(str);
int num=(Integer)u1.getDetail2();
System.out.println(num);

//or just direcltly print by
System.out.println(u1.getDetail());
System.out.println(u1.getDetail2());
}
}

class User <T>{

T t1;
T t2;

public User(T t1 , T t2) {
this.t1 = t1;
this.t2 = t2;
}

public T getDetail(){
return t1;
}

public T getDetail2(){
return t2;
}
}

Answer 9

Jayakrishna🇮🇳 ohhhh, this whole time I was looking at Muhammadamin s code... I know you need to do that. My bad, Thanks!