import java.util.*; import java.lang.*; import java.io.*; class Phone { private String phonebook; private String listofcalls; private String textmessages; public Phone(String pb,String lc,String tm) //parameterized constructor to initialize variables { phonebook=pb; listofcalls=lc; textmessages=tm; } public void clear(PhotoAlbum album) // clear the contents of Phone and PhotoAlbum object { phonebook=null; listofcalls=null; textmessages=null; } public void display() //display variables { System.out.println(\"\ phonebook =\"+phonebook+\"\ listof calls= \"+listofcalls+\"\ textmessages= \"+textmessages); } } class PhotoAlbum { private String pics; public PhotoAlbum(String p) //parameterized constructor to initialize variable { pics=p; } public void clear() //clear the variable { pics=null; } public void display() //display variable { System.out.println(\"\ Pictures= \"+pics); } } class CameraPhone extends Phone { public CameraPhone(String phbook,String callist,String messages) { super(phbook,callist,messages); // call to base class parameterized constructor } public void clear(PhotoAlbum album) { super.clear(album); // call to base class clear method album.clear(); } } class TestClear { public static void main (String[] args) throws java.lang.Exception { Phone camphone=new CameraPhone(\"phonebook\",\"callist\",\"messages\"); PhotoAlbum album=new PhotoAlbum(\"pictures\"); camphone.clear(album); // overriding base class method clear() camphone.display(); album.display(); } } output Success time: 0.04 memory: 711168 signal:0 Solution import java.util.*; import java.lang.*; import java.io.*; class Phone { private String phonebook; private String listofcalls; private String textmessages; public Phone(String pb,String lc,String tm) //parameterized constructor to initialize variables { phonebook=pb; listofcalls=lc; textmessages=tm; } public void clear(PhotoAlbum album) // clear the contents of Phone and PhotoAlbum object { phonebook=null; listofcalls=null; textmessages=null; } public void display() //display variables { System.out.println(\"\ phonebook =\"+phonebook+\"\ listof calls= \"+listofcalls+\"\ textmessages= \"+textmessages); } } class PhotoAlbum { private String pics; public PhotoAlbum(String p) //parameterized constructor to initialize variable { pics=p; } public void clear() //clear the variable { pics=null; } public void display() //display variable { System.out.println(\"\ Pictures= \"+pics); } } class CameraPhone extends Phone { public CameraPhone(String phbook,String callist,String messages) { super(phbook,callist,messages); // call to base class parameterized constructor } public void clear(PhotoAlbum album) { super.clear(album); // call to base class clear method album.clear(); } } class TestClear { public static void main (String[] args) throws java.lang.Exception { Phone camphone=new CameraPhone(\"phonebook\",\"callist\",\"messages\"); PhotoAlbum album=new PhotoAlbum(\"pictures\"); camphone.clear(album); // overriding base class metho.

1. import java.util.*;
import java.lang.*;
import java.io.*;
class Phone
{
private String phonebook;
private String listofcalls;
private String textmessages;
public Phone(String pb,String lc,String tm) //parameterized constructor to initialize variables
{
phonebook=pb;
listofcalls=lc;
textmessages=tm;
}
public void clear(PhotoAlbum album) // clear the contents of Phone and PhotoAlbum object
{
phonebook=null;
listofcalls=null;
textmessages=null;
}
public void display() //display variables
{
System.out.println(" phonebook ="+phonebook+" listof calls= "+listofcalls+"
textmessages= "+textmessages);
}
}
class PhotoAlbum
{
private String pics;
public PhotoAlbum(String p) //parameterized constructor to initialize variable
{

2. pics=p;
}
public void clear() //clear the variable
{
pics=null;
}
public void display() //display variable
{
System.out.println(" Pictures= "+pics);
}
}
class CameraPhone extends Phone
{
public CameraPhone(String phbook,String callist,String messages)
{
super(phbook,callist,messages); // call to base class parameterized constructor
}
public void clear(PhotoAlbum album)
{
super.clear(album); // call to base class clear method
album.clear();
}
}
class TestClear
{
public static void main (String[] args) throws java.lang.Exception
{
Phone camphone=new CameraPhone("phonebook","callist","messages");
PhotoAlbum album=new PhotoAlbum("pictures");
camphone.clear(album); // overriding base class method clear()
camphone.display();
album.display();
}

3. }
output
Success time: 0.04 memory: 711168 signal:0
Solution
import java.util.*;
import java.lang.*;
import java.io.*;
class Phone
{
private String phonebook;
private String listofcalls;
private String textmessages;
public Phone(String pb,String lc,String tm) //parameterized constructor to initialize variables
{
phonebook=pb;
listofcalls=lc;
textmessages=tm;
}
public void clear(PhotoAlbum album) // clear the contents of Phone and PhotoAlbum object
{
phonebook=null;
listofcalls=null;
textmessages=null;
}
public void display() //display variables
{
System.out.println(" phonebook ="+phonebook+" listof calls= "+listofcalls+"
textmessages= "+textmessages);
}
}

4. class PhotoAlbum
{
private String pics;
public PhotoAlbum(String p) //parameterized constructor to initialize variable
{
pics=p;
}
public void clear() //clear the variable
{
pics=null;
}
public void display() //display variable
{
System.out.println(" Pictures= "+pics);
}
}
class CameraPhone extends Phone
{
public CameraPhone(String phbook,String callist,String messages)
{
super(phbook,callist,messages); // call to base class parameterized constructor
}
public void clear(PhotoAlbum album)
{
super.clear(album); // call to base class clear method
album.clear();
}
}
class TestClear
{
public static void main (String[] args) throws java.lang.Exception
{
Phone camphone=new CameraPhone("phonebook","callist","messages");
PhotoAlbum album=new PhotoAlbum("pictures");

5. camphone.clear(album); // overriding base class method clear()
camphone.display();
album.display();
}
}
output
Success time: 0.04 memory: 711168 signal:0