//: polymorphism/RTTI.java

package polymorphism; /* Added by Eclipse.py */

// Downcasting & Runtime type information (RTTI).

// {ThrowsException}

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

}

} ///:~