Question

The abstract class SayHello and the static method process are defined as followed:

class SayHello

{

            private String greeting;

SayHello(   )

            {

                        greeting = “Hello guys”;

            }

SayHello( String wts )

            {

                        greeting = wts;

            }

            void printGreeting( );

}

static void process( SayHello obj )

{

            obj.printGreeting(   );

}

Write the statements to instantiate an object (with its instance variable initialized with the string “Bonjour mes amis” ) of the anonymous class that extends this abstract class by using the following definition of printGreeting(   ); then write a statement to call method process by passing to it that object.

void  printGreeting(    )

{

            System.out.println( greeting );

}

Answer 1

SayHello.java

public abstract class SayHello {
protected String greeting;
  
public SayHello()
{
greeting = "Hello guys";
}

public SayHello(String wts) {
greeting = wts;
}
  
public abstract void printGreeting();
}

SayHelloSuper.java

public class SayHelloSuper extends SayHello {

public SayHelloSuper()
{
super();
}

public SayHelloSuper(String wts) {
super(wts);
}
  
@Override
public void printGreeting() {
System.out.println(greeting);
}
}

ProcessMain.java (Driver/Main class)

public class ProcessMain {
  
public static void main(String[] args) {
SayHelloSuper sayHelloSuper1 = new SayHelloSuper();
SayHelloSuper sayHelloSuper2 = new SayHelloSuper("Bonjour mes amis");
System.out.println("Initializing an instance of SayHelloSuper class with default constructor..\nResult of calling the method printGreeting()..");
process(sayHelloSuper1);
System.out.println("\nInitializing another instance of SayHelloSuper class with parameterized constructor..\nResult of calling the method printGreeting()..");
process(sayHelloSuper2);
}
  
public static void process(SayHello obj)
{
obj.printGreeting();
}
}

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