FilesExpand file tree

 master

/

RTTI.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

32 lines (29 loc) · 698 Bytes

 master

/

RTTI.java

Copy path

Top

File metadata and controls

• Code
• Blame

32 lines (29 loc) · 698 Bytes

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

//: polymorphism/RTTI.java

// Downcasting & Runtime type information (RTTI).

// {ThrowsException}

package TIJ4_code.polymorphism;

class Useful {

public void f() {}

public void g() {}

}

class MoreUseful extends Useful {

public void f() {}

public void g() {}

public void u() {}

public void v() {}

public void w() {}

}

public class RTTI {

public static void main(String[] args) {

Useful[] x = {

new Useful(),

new MoreUseful()

};

x[0].f();

x[1].g();

// Compile time: method not found in Useful:

//! x[1].u();

((MoreUseful)x[1]).u(); // Downcast/RTTI

((MoreUseful)x[0]).u(); // Exception thrown

}

} ///:~