Inheritance Understand with inner class and inner static class
__________________1
I am static A
I am static B
I am static C
I am static F
I am {} A
I am parameterised constructor A
I am {} B
I am constructor B
I am {} C
__________________2
I am function A
__________________3
30
__________________4
I am {} A
I am parameterised A
__________________5
10
__________________6
20
__________________7
50
__________________8
I am {} A
I am parameterised constructor A
I am {} B
I am constructor B
I am {} C
__________________9
__________________10
I am function C.D
__________________11
I am {} A
I am parameterised constructor A
I am {} B
I am constructor B
__________________12
60
__________________13
class A {
int i = 10;
static {
System.out.println("I am static A");
}
{
System.out.println("I am {} A");
}
public A() {
System.out.println("I am parameterised A");
}
public A(int i) {
this.i = i + 20;
System.out.println("I am parameterised constructor A");
}
void function() {
System.out.println("I am function A");
}
}
class B extends A {
static int i = 10;
static {
System.out.println("I am static B");
}
{
System.out.println("I am {} B");
}
public B() {
super(i);
System.out.println("I am constructor B");
}
}
class C extends B{
static class D
{
static int i=50;
}
class E
{
B b=new B();
}
static
{
System.out.println("I am static C");
}
{
System.out.println("I am {} C");
}
C(){
i = i + 10;
}
}
class F extends C{
class H extends D
{
void function()
{
System.out.println("I am function C.D");
}
}
class G extends E
{
int i = 60;
public G(){
super();
}
}
static
{
System.out.println("I am static F");
}
}
public class Source{
public static void main(String[] args)
{
System.out.println("__________________1");
A a = new F();
System.out.println("__________________2");
a.function();
System.out.println("__________________3");
System.out.println(a.i);
System.out.println("__________________4");
a=new A();
System.out.println("__________________5");
System.out.println(a.i);
System.out.println("__________________6");
System.out.println(B.i);
System.out.println("__________________7");
System.out.println(C.D.i);
System.out.println("__________________8");
F f=new F();
System.out.println("__________________9");
F.H b=f.new H();
System.out.println("__________________10");
b.function();
System.out.println("__________________11");
F.G c=f.new G();//this is inner non static class call
System.out.println("__________________12");
System.out.println(c.i);
System.out.println("__________________13");
}
}
__________________1
I am static A
I am static B
I am static C
I am static F
I am {} A
I am parameterised constructor A
I am {} B
I am constructor B
I am {} C
__________________2
I am function A
__________________3
30
__________________4
I am {} A
I am parameterised A
__________________5
10
__________________6
20
__________________7
50
__________________8
I am {} A
I am parameterised constructor A
I am {} B
I am constructor B
I am {} C
__________________9
__________________10
I am function C.D
__________________11
I am {} A
I am parameterised constructor A
I am {} B
I am constructor B
__________________12
60
__________________13
Sequence is ---> static block -->simple block --->
class A {
int i = 10;
static {
System.out.println("I am static A");
}
{
System.out.println("I am {} A");
}
public A() {
System.out.println("I am parameterised A");
}
public A(int i) {
//Constructor incrementing static variable or simple variable
this.i = i + 20;
System.out.println("I am parameterised constructor A");
}
void function() {
System.out.println("I am function A");
}
int a; //initialized to zero
static int b; //initialized to zero only when class is loaded not for each object created.
A(String x,String y){
//Constructor incrementing static variable b
b++;
}
public void showData(){
System.out.println("Value of a = "+a);
System.out.println("Value of b = "+b);
}
}
class B extends A {
static int i = 10;
static {
System.out.println("I am static B");
}
{
System.out.println("I am {} B");
}
public B() {
super(i);
System.out.println("I am constructor B");
}
}
class C extends B{
static class D
{
static int i=50;
}
class E
{
B b=new B();
}
static
{
System.out.println("I am static C");
}
{
System.out.println("I am {} C");
}
C(){
i = i + 10;
}
}
class F extends C{
class H extends D
{
void function()
{
System.out.println("I am function C.D");
}
}
class G extends E
{
int i = 60;
public G(){
super();
}
}
static
{
System.out.println("I am static F");
}
}
public class Source{
public static void main(String[] args)
{
System.out.println("__________________1");
//this will print first static block and next with out static block from A to F
A a = new F();
System.out.println("__________________2");
a.function();
System.out.println("__________________3");
System.out.println(a.i);
System.out.println("__________________4");
a=new A();
System.out.println("__________________5");
System.out.println(a.i);
System.out.println("__________________6");
System.out.println(B.i);
System.out.println("__________________7");
System.out.println(C.D.i);
System.out.println("__________________8");
F f=new F();
System.out.println("__________________9");
//this is inner non static class call
F.H b=f.new H();
System.out.println("__________________10");
b.function();
System.out.println("__________________11");
//this is inner non static class call
F.G c=f.new G();
System.out.println("__________________12");
System.out.println(c.i);
System.out.println("__________________13");
// static inner class declaration
C.D innerTwo=new C.D();
System.out.println(innerTwo.i);
// this is inner super class with parameterised argument pass
B b1=new B();
C c1=new C(b1);
System.out.println(c1.a.i);
}
}
Other Links: Inheritance Understand Part 1 Inheritance Understand Part 2 Inheritance Understand Part 3 Inheritance Understand Part 4 GENERATING KEYSTORE FILES
I am Kartik Chandra Mandal from Bangalore, India. Working as software engineer in Java technology. Have good knowledge of OWASP and CSRF in security for applications and it's implementation in Java technology.