Java_practical_handbook

JAVA PRACTICAL HANDBOOK
1. Basic Java class
class Ex1
{
public static void main(String args[])
{
int width;
int length;
int height;
width=5;
length=12;
height=3;
int v;
v=width*length*height;
System.out.println("Volume is :"+v);
}
}
Volume is :180
JAVA PRACTICAL HANDBOOK Page 1

2.
class Ex2
{
{
int width;
int length;
int height;
width=5;
length=12;
height=3;
int v;
//Box 2
int width1;
int length1;
int height1;
width1=50;
length1=120;
height1=30;
int v1;
v1=width1*length1*height1;
System.out.println("Volume is :"+v1);
}
}
Volume is :180
Volume is :180000

3.
class Box
{
int width;
int length;
int height;
}c
lass BoxDemo
{
{
int x;
x=100;
System.out.println(x);
Box b1;
b1=new Box();
System.out.println(b1);
b1.width=5;
b1.length=12;
b1.height=3;
int v;
v=b1.width*b1.length*b1.height;
}
}
100
Box@119298d
Volume is :180

4.
class Box
{
int width;
int length;
int height;
}
class BDemo
{
{
Box b1=new Box();
b1.width=5;
b1.length=12;
b1.height=3;
int v;
v=b1.width*b1.length*b1.height;
//Box 2
Box b2=new Box();
b2.width=50;
b2.length=120;
b2.height=30;
int v1;
v1=b2.width*b2.length*b2.height;
System.out.println("Volume is :"+v1);
}
}
Volume is :180
Volume is :180000

5. Methods
class Box
{
//Variable declarations
int width;
int length;
int height;
//Creating a method to print Volume
void printVolume()
{
System.out.println("Volume is :"+(width*length*height));
}
}
class BDemo1
{
{
Box b1=new Box();
b1.width=5;
b1.length=12;
b1.height=3;
b1.printVolume();
//Box 2
Box b2=new Box();
b2.width=50;
b2.length=120;
b2.height=30;
b2.printVolume();
}
}
Volume is :180
Volume is :180000

6.
class Box
{
int width;
int length;
int height;
void printVolume()
{
int v;
}
}
class BDemo2
{
{
Box b1=new Box();
b1.width=5;
b1.length=12;
b1.height=3;
b1.printVolume();
//Box 2
Box b2=new Box();
b2.width=50;
b2.length=120;
b2.height=30;
b2.printVolume();
}
}
Volume is :180
Volume is :180000

7.
class Box
{
int width;
int length;
int height;
void printVolume()
{
int v;
}v
oid setValues(int w, int l, int h)
{
width=w;
length=l;
height=h;
}
}
class BDemo3
{
{
Box b1=new Box();
b1.setValues(5,12,3);
b1.printVolume();
Box b2=new Box();
b2.printVolume();
}
}
Volume is :180
Volume is :180000

8. Methods with a return type
class Box
{
int width;
int length;
int height;
void printVolume()
{
int v;
}v
{
width=w;
length=l;
height=h;
}i
nt getVolume()
{
int v;
return v;
}
}c
lass BDemo4
{
{
Box b1=new Box();
int v1=b1.getVolume();//returs volume (int)
v1+=100;
System.out.println("Volume :"+v1);
}
}
Volume :280

9.
class A
{
int tot(int i, int j)
{
int k=i+j;
System.out.println("tot :"+k);
return k;
}
}
class DemoA
{
{
A a1=new A();
int t=a1.tot(10,20);
t++;
System.out.println("Tot now :"+t);
}
}
tot :30
Tot now :31

10.
class A
{
int tot(int i, int j)
{
int k=i+j;
System.out.println("tot :"+k);
return k;
}
}
class DemoA1
{
{
A a1=new A();
a1.tot(10,20);
}
}
tot :30

11. Default values of attributes
class Box
{
int width;
int length;
int height;
void printVolume()
{
int v;
}v
{
width=w;
length=l;
height=h;
}i
nt getVolume()
{
int v;
return v;
}
}c
lass BDemo5
{
{
Box b1=new Box();
b1.printVolume();
}
}
Volume is :180
Volume is :180000

12.
class Box
{
int width=10;
int length=10;
int height=10;
void printVolume()
{
int v;
}
void setValues(int w, int l, int h)
{
width=w;
length=l;
height=h;
}
int getVolume()
{
int v;
return v;
}
}
class BDemo6
{
{
Box b1=new Box();
b1.printVolume();
}
}
Volume is :1000

13. Constructors
class Box
{
Box()
{
System.out.println("a box is created..");
}
}c
lass BDemo7
{
{
Box b1=new Box(); //Prints "a box is created.." calling Box
constructor
Box b2=new Box(); //Prints "a box is created.."
}
}
a box is created..
a box is created..

14.
class Box
{
int width=10;
int length=10;
int height=10;
Box()
{
width=2;
length=2;
height=2;
}/
/Creating a method to print Volume
void printVolume()
{
int v;
}
}
class BDemo8
{
{
Box b1=new Box();
b1.printVolume();//prints Volume is 8 calling Box
Constructor
}
}
Volume is :8

15.
class Box
{
int width;
int length;
int height;
Box(int w, int l, int h)
{
width=w;
length=l;
height=h;
}/
/Creating a method to print Volume
void printVolume()
{
int v;
}
}c
lass BDemo9
{
{
Box b1=new Box(5,12,3);//Calling constructor with parameters
b1.printVolume();
Box b2=new Box(50,120,30);
b2.printVolume();
}
}
Volume is :180
Volume is :180000

16. Method Overloading
class Box
{
int width;
int length;
int height;
void printVolume()
{
int v;
}v
{
width=w;
length=l;
height=h;
}v
oid setValues(int l)
{
width=l;
length=l;
height=l;
}
}c
lass BDemo10
{
{
Box b1=new Box();
b1.printVolume();
Box b2=new Box();
b2.setValues(5);//Call overloaded method "setValues(int)"
b2.printVolume();
}
}
Volume is :36
Volume is :125

17. Example for "this"
class Black
{
int a;
void setA(int a)
{
a=a; //call "this.a=a"
}v
oid setB(int a)
{
this.a=a;
}
}c
lass DemoBlack
{
{
Black a1=new Black();
a1.setA(10);
System.out.println("Without this "+a1.a);
a1.setB(10);
System.out.println("Using this "+a1.a);
}
}
Without this 0
Using this 10

18. Primitive VS Ref. Variables
class Box
{
int length;
int width;
int height;
Box b1;
}c
lass BDemo11
{
{
Box ob1=new Box();
System.out.println(ob1.length);
System.out.println(ob1.b1);
ob1.length=12;
ob1.width=5;
ob1.height=3;
ob1.b1=new Box();
}
}
0 null
12
Box@f72617

19.
class Box
{
int length;
int width;
int height;
Box b1;
Box()
{
length=1;
width=1;
height=1;
b1=this;
}v
oid setValues(int length, int width, int height)
{
b1.length=length;//this.length=length;
}
}c
lass BDemo12
{
{
Box ob1=new Box();
}
}
1
Box@119298d

20.
class A
{
int a;
X x1;
Y y1;
Z z1;
}c
lass BDemo13
{
{
A a1=new A();
System.out.println(a1.a);
System.out.println(a1.x1);
System.out.println(a1.y1);
System.out.println(a1.z1);
System.out.println("********");
a1.a=100;
a1.x1=new X();
a1.y1=new Y();
System.out.println(a1.a);
System.out.println(a1.x1);
System.out.println(a1.y1);
System.out.println(a1.z1);
}
}c
lass X{}
class Y{}
class Z{}
0 null
null
null
********
100
X@1fc4bec
Y@dc8569
null

21. Call By Values
class ADemo2
{
{
int x=10;
System.out.println("X :"+x);
A a1=new A();
a1.incr(x);
}
}c
lass A
{
void incr(int x)
{
x++;
}
}
X :10
X :11
X :10

22. Call By Ref
class BDemo14
{
{
V v1=new V();
System.out.println("X :"+v1.x);
A a1=new A();
a1.incr(v1);
}
}c
lass A
{
void incr(V v1)
{
v1.x++;
}
}c
lass V
{
int x=10;
}
X :10
X :11
X :11

23. Call by values
class BDemo15
{
{
int x=10, y=20;
System.out.println(x+" "+y);
A a1=new A();
a1.change(x,y);
}
}c
lass A
{
void change(int x, int y)
{
int z;
z=x;
x=y;
y=z;
}
}
10 20
20 10
10 20

24. Static variables
class A
{
int a;
int b;
}
class BDemo16
{
{
A a1=new A();
a1.a=10;
a1.b=20;
System.out.println("Object a1 a :"+a1.a+" b :"+a1.b);
A a2=new A();
a2.a=100;
a2.b=200;
}
}
Object a1 a :10 b :20

25.
class A
{
int a;
static int b;
}
class BDemo17
{
{
A a1=new A();
a1.a=10;
a1.b=20;
A a2=new A();
a2.a=100;
a2.b=200;
}
}

26.
class A
{
int a;
static int b;
}
class BDemo18
{
{
A a1=new A();
a1.a=10;
a1.b=20;
A a2=new A();
a2.a=100;
a2.b=200;
a1.a=10000;
a1.b=20000;
A a3=new A();
A.b=2000000;//
System.out.println("a1.b :"+a1.b+" a2.b :"+a2.b+" a3.b
:"+a3.b);
}
}
Object a2 a :100 b :200
Object a2 a :100 b :20000
Object a3 a :0 b :20000
a1.b :2000000 a2.b :2000000 a3.b :2000000

27. Static methods
class A
{
void m1()
{
System.out.println("m1");
}s
tatic void m2()
{
System.out.println("m2");
}
}
class BDemo19
{
{
A ob=new A();
ob.m1();
A.m2();// without creating object can call method
}
}
m1
m2

28.
class A
{
int x=10;
static int y=20;
void m1()
{
System.out.println(x);
System.out.println(y);
}
}
class BDemo20
{
{
new A().m1();
}
}
10
20

29.
class A
{
int x=10;
static int y=20;
void m1()
{
System.out.println(this.x);
System.out.println(this.y);
}
}
class BDemo21
{
{
new A().m1();
}
}
10
20

30. Object / static initializer
class A
{
static
{
System.out.print("1 ");
}{
}A
()
{
}v
oid m1()
{
}s
tatic void m2()
{
}
}
class BDemo22
{
{
new A();
A.m2();
}
}
1 2 3 5

31.
class A
{
int a;
void printA()
{
System.out.println("a :"+a);
}
}c
lass B extends A
{
int b;
void printB()
{
System.out.println("b :"+b);
}v
oid printAB()
{
System.out.println("a+b :"+(a+b));
}v
oid callAB()
{
printA();
printB();
}
}c
lass BDemo23
{
{
B b1=new B();
b1.a=10;
b1.b=20;
b1.printA();
b1.printB();
b1.printAB();
b1.callAB();
}
}
a :10
b :20
a+b :30
a :10
b :20

32. super class Constructor
class A
{
int a;
A()
{
System.out.println("A()");
}A
(int i)
{
System.out.println("A(int)");
}v
oid printA()
{
}
}c
lass B extends A
{
int b;
B()
{
System.out.println("B()");
}B
(int i)
{
System.out.println("B(int)");
}v
oid printB()
{
}v
oid printAB()
{
}v
oid callAB()
{
printA();
printB();
}
}c
lass BDemo24
{
{
B b1=new B();
B b2=new B(100);
}

}
A()
B()
A()
B(int)
33.
class A
{
int a;
A()
{
}A
(int i)
{
}v
oid printA()
{
}
}
class B extends A
{
int b;
B()
{
super();
}B
(int i)
{
super();
}v
oid printB()
{
}v
oid printAB()
{
}void callAB(){

printA();
printB();
}
}c
lass BDemo25
{
{
B b1=new B();
B b2=new B(100);
}
}
A()
B()
A()
B(int)

34.
class A
{
int a;
A()
{
}A
(int i)
{
}v
oid printA()
{
}
}c
lass B extends A
{
int b;
B()
{
super();//
}B
(int i)
{
super(i);//super(100);
}v
oid printB()
{
}v
oid printAB()
{
}v
oid callAB()
{
printA();
printB();
}
}c
lass BDemo26
{
{
B b1=new B();

B b2=new B(100);
}
}
A()
B()
A(int)
B(int)

35.
class A
{
int a;
A()
{
}A
(int i)
{
}v
oid printA()
{
}
}c
lass B extends A
{
int b;
B()
{
super();//
}B
(int i)
{
super(i);//super(100);
}v
oid printB()
{
}v
oid printAB()
{
}v
oid callAB()
{
printA();
printB();
}
}c
lass BDemo27
{
{
A a1;

a1=new B();
//B b1=new A();//Error
a1.a=10;
// a1.b=20; Error
a1.printA();
/* a1.printB();//Error
a1.printAB();//Error
a1.callAB();//Error */
}
}
A()
B()
a :10

36. Method Overriding
class A
{
int a;
void printA()
{
}v
oid print()
{
System.out.println("A.print");
}
}
class B extends A
{
int b;
void printB()
{
}v
oid printAB()
{
}v
oid callAB()
{
printA();
printB();
}v
oid print()
{
System.out.println("B.print");
}
}
class BDemo28
{
{
A a1=new B();
a1.print();
}
}
B.print

37.
class Vehicle
{
void park()
{}
}c
lass Car extends Vehicle
{
void park()
{
System.out.println("Car park");
}
}c
lass Bus extends Vehicle
{
void park()
{
System.out.println("Bus park");
}
}c
lass MB extends Vehicle
{
void park()
{
System.out.println("MB park");
}
}c
lass BDemo29
{
public static void main(String argsp[])
{
Vehicle ob;
ob=new Car();
ob.park(); //print "Car park"
ob=new Bus();
ob.park(); //print "Bus park"
ob=new MB();
ob.park(); //print "MB park"
}
}
Car park
Bus park
MB park

38.
class A
{
static
{
}{
}A
()
{
}s
tatic void mA()
{
}
}c
lass B extends A
{
static
{
}{
}B
()
{
}s
tatic void mB()
{
}
}c
lass BDemo30
{
{
new B();
}
}
1 5 2 3 6 7

39.
class A
{
static
{
}{
}A
()
{
}s
tatic void mA()
{
}
}c
lass B extends A
{
static
{
}{
}B
()
{
}s
tatic void mB()
{
}
}c
lass BDemo31
{
{
B.mA(); //Prints 1 4
}
}
1 4

40. Way of invoking "super()" and "this()"
class A
{
A(int i)
{
System.out.println("A(int) :"+i);
}
}c
lass B extends A
{
B(int i)
{
super(i);
System.out.println("B(int) :"+i);
}
}c
lass BDemo32
{
{
new B(100);
}
}
A(int) :100
B(int) :100

41.
class A
{
A(int i)
{
System.out.println("A(int) :"+i);
}A
(int i, int j)
{
System.out.println("A(int,int) :"+i+" "+j);
}
}c
lass B extends A
{
B(int i)
{
super(100);
System.out.println("B(int) :"+i);
}B
(int i, int j )
{
super(i, j);
System.out.println("B(int, int) :"+i+" "+j);
}
}c
lass BDemo33
{
{
new B(100,200);
}
}
A(int,int) :100 200
B(int, int) :100 200

42. "calling this"
class A
{
int a=100;
A()
{
this(1);
}A
(int i)
{
a=i;
}
}c
lass B extends A
{
int b=200;
B(){
this(1);
}B
(int i)
{
super(i);
b=i;
}B
(int i, int j)
{
super(i);
b=j;//
}v
oid printAB()
{
System.out.println("a b :"+a+" "+b);
}
}c
lass BDemo34
{
{
B b1=new B();
b1.printAB();
B b2=new B(10);
b2.printAB();
B b3=new B(100,200);
b3.printAB();
}
}

a b :1 1
a b :10 10
a b :100 200

43. "this" VS "super"
class A
{
int a=100;
A()
{
this(1);
}A
(int i)
{
a=i;
}
}c
lass B extends A
{
int b=200;
B()
{
this(1);
}B
(int i)
{
super(i);
b=i;
}B
(int i, int j)
{
super(i);
b=j;//
}v
oid printAB()
{
System.out.println("a b :"+a+" "+b);
}
}c
lass BDemo35
{
{
B b1=new B();
b1.printAB();
B b2=new B(10);
b2.printAB();
B b3=new B(100,200);
b3.printAB();
}
}

a b :1 1
a b :10 10
a b :100 200

44.
class A
{
void print()
{
}
}c
lass B extends A
{
void print()
{
}
}c
lass BDemo36
{
public static void main(String args[]){
B b1=new B();
b1.print(); //prints "B.print"
}
}
B.print

45.
class A
{
void print()
{
}
}c
lass B extends A
{
void print()
{
}
}c
lass BDemo37
{
{
A a1=new B();
a1.print();//print "B.print"
}
}
B.print

46.
class A
{
int a=100;
}c
lass B extends A
{
int a=200;
}c
lass BDemo38
{
{
B b1=new B();
int x=b1.a;
System.out.println(x);//print "200"
}
}
200

47.
class A
{
int a=100;
}c
lass B extends A
{
int a=200;
}c
lass BDemo39
{
{
A a1=new B();
int x=a1.a;
System.out.println(x);//print "100"
}
}
100

48.
class A
{
int a=100;
}c
lass B extends A
{
int a=200;
void m()
{
}
}c
lass BDemo40
{
{
B b1=new B();
b1.m(); //prints "a :200"
}
}
200

49. super.a
class A
{
int a=100;
}c
lass B extends A
{
int a=200;
void m()
{
System.out.println("a :"+super.a);
}
}c
lass BDemo41
{
{
B b1=new B();
b1.m();
}
}
a :100
50.
class A
{
int a=100;
}c
lass B extends A
{
int a=200;
}c
lass C extends B
{
int a=300;
void m()
{
}
}c
lass BDemo42
{
{
C c1=new C();
c1.m();
}

}
a :300

51.
class A
{
void print()
{
}
}c
lass B extends A
{
void print()
{
}
}c
lass C extends B
{
void print()
{
System.out.println("C.print");
}v
oid m()
{
print();
}
}c
lass BDemo43
{
{
C c1=new C();
c1.m();
}
}
C.print

52.
class A
{
void print()
{
}
}c
lass B extends A
{
void print()
{
}
}c
lass C extends B
{
void print()
{
System.out.println("C.print");
}v
oid m()
{
super.print();
}
}c
lass BDemo44
{
{
C c1=new C();
c1.m();
}
}
B.print

53.
class A
{
A()
{
print();
}v
oid print()
{
}
}c
lass B extends A
{
void print()
{
}
}
class BDemo45
{
{
new B();
}
}
B.print

54.
class A
{
int a=100;
A()
{
print();
}v
oid print()
{
System.out.println("A.print "+a);
}
}c
lass B extends A
{
int a=200;
void print()
{
System.out.println("B.print "+a);
}
}
class BDemo46
{
{
new B();
}
}
B.print 0

55.
class A
{
int a=100;
A()
{
print();
}v
oid print()
{
}
}c
lass B extends A
{
//int a=200;
void print()
{
}
}
class BDemo47
{
{
new B();
}
}
B.print 100

56.
class A
{
int a=100;
A()
{
print();
}v
oid print()
{
}
}c
lass B extends A
{
static int a=200;
void print()
{
}
}
class BDemo48
{
{
new B();
}
}
B.print 200

57.
class A
{
A()
{
print();
}s
tatic void print()
{
System.out.println("A.print ");
}
}c
lass B extends A
{
static void print()
{
System.out.println("B.print ");
}
}
class BDemo49
{
{
new B();
}
}
A.print

58. Private methods
class A
{
void m1()
{
System.out.println("A.m1");
}p
rivate void m2()
{
System.out.println("A.m2");
}v
oid mA()
{
m1();
m2();
}
}
class BDemo50
{
public static void main(String asrgs[])
{
new A().mA();
new A().m1();
/* new A().m2(); error: m2() has private access in A new
A().m2(); */
}
}
A.m1
A.m2
A.m1

59.
class A
{
A()
{
print();
}p
rivate void print()
{
System.out.println("A.print ");
}
}c
lass B extends A
{
void print()
{
System.out.println("B.print ");
}
}
class BDemo51
{
public static void main(String args[]){
new B();
}
}
A.print

60.
class A
{
X print()
{
X x1=new X();
System.out.println("X.print ");
return x1;
}
}c
lass B extends A
{
Y print()
{
Y y1=new Y();
System.out.println("Y.print ");
return y1;
}
}
class BDemo52
{
{
A a1=new B();
X ob= a1.print();
}
}c
lass X{}
class Y extends X {}
Y.print

61. class "Object"
class A
{}c
lass BDemo53
{
{
A a1=new A();
System.out.println(a1.toString());
System.out.println(a1.hashCode());
}
}
A@10385c1
17008065

62.
class A extends Object
{}c
lass BDemo54
{
{
A a1=new A();
System.out.println(a1.hashCode());
}
}
A@10385c1
17008065
63. Demonstrate methods "toString()"
class A
{
int a;
A(int i)
{
a=i;
}
}c
lass BDemo55
{
{
A a1=new A(100);
System.out.println(a1);
}
}
A@10385c1
A@10385c1

64.
class A
{
int a;
A(int i)
{
a=i;
}p
ublic String toString()
{
return ""+a;
}
}c
lass BDemo56
{
{
A a1=new A(100);
System.out.println(a1);
}
}
100
100

65.
class A
{
public String toString()
{
return "class A";
}
}c
lass B extends A
{
{
return "class B";
}
}c
lass C extends B
{
{
return "class C";
}
}c
lass BDemo57
{
{
Object ob;
ob=new A();
System.out.println(ob);
ob=new B();
ob=new C();
}
}
class A
class B
class C

66. Demonstrate methods "equals(Object ob)" of class Object
class A
{
int a;
A(int i)
{
a=i;
}
}c
lass BDemo58
{
{
A a1=new A(100);
A a2=new A(100);
A a3=new A(200);
A a4=a1;
System.out.println(a1==a2);
}
}
false
false
true

67.
class A
{
int a;
A(int i)
{
a=i;
}
}c
lass BDemo59
{
{
A a1=new A(100);
A a2=new A(100);
A a3=new A(200);
A a4=a1;
System.out.println(a1.equals(a2));
}
}
false
false
true

68.
class A
{
int a;
A(int i)
{
a=i;
}p
ublic boolean equals(Object ob)
{
A a1=(A)ob;
return a1.a==this.a ;
}
}c
lass BDemo60
{
{
A a1=new A(100);
A a2=new A(100);
A a3=new A(200);
A a4=a1;
}
}
true
false
true

69. Methods Overloading for class Type
class BDemo61
{
static void m(A a)
{
System.out.println("m(A)");
}s
tatic void m(B a)
{
System.out.println("m(B)");
}s
tatic void m(C a)
{
System.out.println("m(C)");
}p
ublic static void main(String args[])
{
A a1=new A();
B b1=new B();
C c1=new C();
BDemo61.m(a1);
BDemo61.m(b1);
BDemo61.m(c1);
}
}c
lass A{}
class B{}
class C{}
m(A)
m(B)
m(C)

70.
class BDemo62
{
static void m(A a)
{
}s
tatic void m(B a)
{
}p
{
A a1=new A();
B b1=new B();
C c1=new C();
BDemo62.m(a1);
BDemo62.m(b1);
BDemo62.m(c1);
}
}c
lass A{}
class B{}
class C extends B{}
m(A)
m(B)
m(B)

71.
class BDemo63
{
static void m(A a)
{
}s
tatic void m(B a)
{
}p
{
A a1=new A();
B b1=new B();
C c1=new C();
BDemo63.m(a1);
BDemo63.m(b1);
BDemo63.m(c1);
}
}c
lass A{}
class B extends A{}
class C extends B{}
m(A)
m(B)
m(B)

72.
class BDemo64
{
static void m(Object a)
{
System.out.println("m(Object)");
}
{
A a1=new A();
B b1=new B();
C c1=new C();
BDemo64.m(a1);
BDemo64.m(b1);
BDemo64.m(c1);
}
}c
lass A{}
class B extends A{ }
class C extends B{}
m(Object)
m(Object)
m(Object)

73. Abstract Methods
abstract class Vehicle
{
abstract void park();
}c
lass BDemo65
{
{
Vehicle ob;
ob=new Car();
ob.park();
ob=new Bus();
ob.park();
ob=new MB();
ob.park();
}
}c
lass Car extends Vehicle
{
void park()
{
System.out.println("Car park");
}
}c
lass Bus extends Vehicle
{
void park()
{
System.out.println("Bus park");
}
}c
lass MB extends Vehicle
{
void park()
{
System.out.println("MB park");
}
}
Car park
Bus park
MB park

74. Creating an inner class object
class A
{
int i=100;
void m()
{
System.out.print(i);
}c
lass Inner
{
int j=10;
void mn()
{
System.out.print(i+" ");
System.out.print(j);
}
}
}c
lass DemoA2
{
{
A ob=new A();
A.Inner inOb=ob.new Inner();
inOb.mn();
}
}
100 10

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