Exercise-6:
a)super keyword implementation
AIM: Write a JAVA program give example for “super” keyword
SOURCE-CODEs:
(i)Using super to call super class constructor (Without parameters)
class A
{
int l,b;
A()
{
l=10;
b=20;
}
}
class B extends A
{
int h;
B()
{
super();
h=30;
}
int volume()
{
return l*b*h;
}
}
class superdemo
{
public static void main(String args[])
{
B b1=new B();
int r=b1.volume();
System.out.println("The vol. is: "+r);
}
}
OUT-PUT:
The vol. is:6000
(ii)Using super to call super class constructor (With parameters)
class A
{
int l,b;
A(int u,int v)
{
l=u;
b=v;
}
}
class B extends A
{
int h;
B(int u,int v,int w)
{
super(u,v);
h=w;
}
int volume()
{
return l*b*h;
}
}
class superdemo
{
public static void main(String args[])
{
B b1=new B(30,20,30);
int r=b1.volume();
System.out.println("The vol. is: "+r);
}
}
OUT-PUT:
The vol. is:18000
b) Implementing interface
AIM: To write a JAVA program to implement Interface.
SOURCE-CODEs:
(i) First form of interface implementation
interface A
{
void display();
}
class B implements A
{
public void display()
{
System.out.println("B's method");
}
}
class C extends B
{
public void callme()
{
System.out.println("C's method");
}
}
class interfacedemo
{
public static void main(String args[])
{
C c1=new C();
c1.display();
c1.callme();
}
}
OUT-PUT:
B's method
C's method
(ii) Second form of interface implementation
interface D
{
void display();
}
interface E extends D
{
void show();
}
class A
{
void callme()
{
System.out.println("This is in callme method");
}
}
class B extends A implements E
{
public void display()
{
System.out.println("This is in display method");
}
public void show()
{
System.out.println("This is in show method");
}
}
class C extends B
{
void call()
{
System.out.println("This is in call method");
}
}
class interfacedemo
{
public static void main(String args[])
{
C c1=new C();
c1.display();
c1.show();
c1.callme();
c1.call();
}
}
OUT-PUT:
This is in display method
This is in show method
This is in callme method
This is in call method
(iii) Third form of interface implementation
interface A
{
void display();
}
class B implements A
{
public void display()
{
System.out.println("This is in B's method");
}
}
class C implements A
{
public void display()
{
System.out.println("This is C's method");
}
}
class interfacedemo
{
public static void main(String args[])
{
B b1=new B();
C c1=new C();
b1.display();
c1.display();
}
}
OUT-PUT:
This is in B's method
This is C's method
(iv) Fourth form of interface implementation
interface A
{
void display();
}
interface B
{
void callme();
}
interface C extends A,B
{
void call();
}
class D implements C
{
public void display()
{
System.out.println("interface A");
}
public void callme()
{
System.out.println("interface B");
}
public void call()
{
System.out.println("interface C");
}
}
class interfacedemo
{
public static void main(String args[])
{
D d1=new D();
d1.display();
d1.callme();
d1.call();
}
}
OUT-PUT:
interface A
interface B
interface C
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