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class DemoBox{
public static void main(String args[]){
int length;
int height;
int width;
length=12;
height=5;
width=3;
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//////////////////////////////////////////////////////////////////////
Q2
class DemoBox{
public static void main(String args[]){
int length;
int height;
int width;
length=12;
height=5;
width=3;
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
int area;
area=2*length*height+2*length*width+2*height*width;
System.out.println("Area is : "+area);
}
}
/////////////////////////////////////////////////////////////////
Q3
//------------------------Box.java------------------------
class Box{
int length;
int height;
int width;
}
//----------------------DemoBox.java-------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.length=12;
b1.height=5;
b1.width=3;
int volume;
volume=b1.length*b1.height*b1.width;
System.out.println("Volume is : "+volume);
int area;
area=2*b1.length*b1.height+2*b1.length*b1.width+2*b1.height*b1.width;
System.out.println("Area is : "+area);
b1.length=120;
b1.height=50;
b1.width=30;
int volume2;
volume2=b1.length*b1.height*b1.width;
System.out.println("New volume is : "+volume2);
}
}
////////////////////////////////////////////////////////////////////
Q4
class DemoBox{
public static void main(String args[]){
int x;
x=100;
System.out.println(x);
Box b1;
b1=new Box();
System.out.println(b1);
b1.length=12;
b1.height=5;
b1.width=3;
int volume;
volume=b1.length*b1.height*b1.width;
System.out.println("Volume is : "+volume);
}
}
/////////////////////////////////////////////////////////////////////
Q5
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
Box b2=new Box();
System.out.println(b1);
System.out.println(b2);
}
}
///////////////////////////////////////////////////////////////////
Q6
class DemoBox{
public static void main(String args[]){
Box b1;
b1=new Box();
b1.length=10;
b1.height=4;
b1.width=2;
System.out.println("Length of the box : "+b1.length);
System.out.println("Height of the box : "+b1.height);
System.out.println("Width of the box : "+b1.width);
}
}
/////////////////////////////////////////////////////////////////
Q7 Java Method
===========
//------------------------Box.java-------------------------
class Box{
int length;
int height;
int width;
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//-----------------------DemoBox.java-----------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.length=12;
b1.height=5;
b1.width=3;
b1.printVolume();
int area;
area=2*b1.length*b1.height+2*b1.length*b1.width+2*b1.height*b1.width;
System.out.println("Area is : "+area);
b1.length=120;
b1.height=50;
b1.width=30;
b1.printVolume();
}
}
/////////////////////////////////////////////////////////////////
Q8 Java Method and Local Variable
==============================
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.length=12;
b1.height=5;
b1.width=3;
b1.printVolume();
System.out.println("end.");
}
}
//////////////////////////////////////////////////////////////
Q9 Example
class Box{
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
int length; //Legal
int height; //Legal
int width; //Legal
}
//////////////////////////////////////////////////////////////////
Q10 Example
//--------------------------Box.java-------------------------
class Box{
int length;
int height;
int width;
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
void printArea(){
int area;
area=2*length*height+2*length*width+2*height*width;
System.out.println("Area is : "+area);
}
}
//---------------------------DemoBox.java-----------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.length=12;
b1.height=5;
b1.width=3;
b1.printVolume();
b1.printArea();
System.out.println("end.");
}
}
//////////////////////////////////////////////////////////////////
Q11 Example
class Box{
int length;
int height;
int width;
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
System.out.println("box class"); //Illegal
int x; //Legal
void printArea(){
int area;
area=2*length*height+2*length*width+2*height*width;
System.out.println("Area is : "+area);
}
}
//////////////////////////////////////////////////////////////////
Q12 Method with Parameters
//--------------------------Box.java--------------------------
class Box{
int length;
int height;
int width;
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
void printArea(){
int area;
area=2*length*height+2*length*width+2*height*width;
System.out.println("Area is : "+area);
}
}
//---------------------------DemoBox.java---------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.setValues(12,5,3);
b1.printVolume();
}
}
//////////////////////////////////////////////////////////////////////
Q13 Example
//------------------------Box.java--------------------------------
class Box{
int length;
int height;
int width;
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
void setLength(int l){
length=l;
}
void setHeight(int h){
height=h;
}
void setWidth(int w){
width=w;
}
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
void printArea(){
int area;
area=2*length*height+2*length*width+2*height*width;
System.out.println("Area is : "+area);
}
}
//-----------------------DemoBox.java--------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.setValues(12,5,3);
b1.printVolume();
b1.setLength(120);
b1.setHeight(50);
b1.setWidth(30);
b1.printVolume();
}
}
////////////////////////////////////////////////////////////////////
Q14 Example
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.setValues(12,5,3);
Box b2=new Box();
b2.setValues(4,3,2);
b1.printVolume();
}
}
///////////////////////////////////////////////////////////////////
Q15 Default Values
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.printVolume(); //Prints 0 =>Defalut values
}
}
byte => 0 (8bits)
short => 0 (16bits)
int => 0 (32bits)
long => 0 (64bits)
float => 0.0 (32bits)
double => 0.0 (64bits)
char => null character
boolean =>false
//////////////////////////////////////////////////////////////////
Q16 Decleration Values
//--------------------------Box.java-----------------------
class Box{
int length=5;
int height=5;
int width=5;
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//-------------------------DemoBox.java--------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.printVolume();
}
}
////////////////////////////////////////////////////////////////
Q17 Method With a return value
//---------------------------Box.java-------------------------
class Box{
int length;
int height;
int width;
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
int getVolume(){
int volume;
volume=length*height*width;
return volume;
}
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//---------------------------DemoBox.java------------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.setValues(12,5,3);
//int v=b1.printVolume();
int v=b1.getVolume();
v++;
System.out.println("New Volume is : "+v);
}
}
//////////////////////////////////////////////////////////////////
Q18 Example
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.setValues(12,5,3);
System.out.println(b1.printVolume()); //Error
System.out.println(b1.getVolume());
}
}
//////////////////////////////////////////////////////////////////
Q19 Example
class Box{
int length;
int height;
int width;
int getVolume(){
int volume;
volume=length*height*width;
return volume;
System.out.println("end."); //Error
}
}
//////////////////////////////////////////////////////////////////
Q20 Example
class Box{
int length;
int height;
int width;
int getVolume(){
double volume;
volume=length*height*width;
return volume; //Illegal
}
}
/////////////////////////////////////////////////////////////////
Q21 Constructors
//---------------------------Box.java-------------------------
class Box{
int length;
int height;
int width;
Box(){
length=10;
height=10;
width=10;
System.out.println("Box is created...");
}
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//---------------------------DemoBox.java----------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
//b1.printVolume();
}
}
//////////////////////////////////////////////////////////////////////
Q22 Case I
======
//----------------------------Box.java---------------------------------
class Box{
int length;
int height;
int width;
void Box(){
length=10;
height=10;
width=10;
System.out.println("Box is created...");
}
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//--------------------------DemoBox.java---------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box();
b1.printVolume(); //print "0"
}
}
////////////////////////////////////////////////////////////////////////
Q23 Case II
=======
class Box{
int length;
int height;
int width;
Box(){ //Compiler insert
//
}
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//////////////////////////////////////////////////////////////
Q24 Case III (Constructor with parameters)
======================================
class Box{
int length;
int height;
int width;
Box(int l, int h, int w){
length=l;
height=h;
width=w;
}
void setValues(int l, int h, int w){
length=l;
height=h;
width=w;
}
void printVolume(){
int volume;
volume=length*height*width;
System.out.println("Volume is : "+volume);
}
}
//-----------------------------DemoBox.java---------------------------
class DemoBox{
public static void main(String args[]){
Box b1=new Box(12,5,3);
b1.printVolume();
}
}
///////////////////////////////////////////////////////////////////////////
Q25 Static Variable
===============
class A{
int a;
static int b;
}
class Demo{
public static void main(String args[]){
A a1=new A();
a1.a=10;
a1.b=20;
A a2=new A();
a2.a=100;
a2.b=200;
System.out.println(a1.a+" "+a1.b); //prints
System.out.println(a2.a+" "+a2.b); //prints
}
}
///////////////////////////////////////////////////////////////////
Q26 Static Variables
================
class A{
int a=100;
static int b=200;
}
class Demo{
public static void main(String args[]){
//System.out.println(A.a); //Illegal
System.out.println(A.b); //prints 200
A a1=null;
System.out.println(a1.b); //prints 200
}
}
//////////////////////////////////////////////////////////////////
Q27 Static Methods
==============
class A{
void m1(){
System.out.println("method m1");
}
static void m2(){
System.out.println("method m2");
}
}
class Demo{
public static void main(String args[]){
//A.m1();
A.m2(); //Legal m2 is static
}
}
/////////////////////////////////////////////////////////////////
Q28 Example
class A{
int a=10;
static int b=20;
void m1(){
System.out.println("a : "+a);
System.out.println("b : "+b);
}
static void m2(){
System.out.println("a : "+a);
System.out.println("b : "+b);
}
}
class Demo{
public static void main(String args[]){
}
}
/////////////////////////////////////////////////////////////////
Q29 Example
class MyClass{
int a;
static int b;
MyClass(int i,int j){
a=i;
b=j;
}
void printValues(){
System.out.println(a+" "+b);
}
}
class Demo{
public static void main(String args[]){
MyClass ob1=new MyClass(1,2);
MyClass ob2=new MyClass(10,20);
MyClass ob3=new MyClass(100,200);
ob1.printValues();
ob2.printValues();
ob3.printValues();
}
}
////////////////////////////////////////////////////////////////////////
Q30 Static Initilizer VS Object Initilizer
=======================================
class MyClass{
static int value;
static void m(){
//System.out.println(value);
}
static{
System.out.println("static block");
}
}
class Demo{
public static void main(String args[]){
MyClass c1=new MyClass();
}
}
////////////////////////////////////////////////////////////////////
Q31 Example
class MyClass{
static int value=100;
static{
System.out.println("static block");
System.out.println("block :" +value);
value=200;
}
static void m(){
System.out.println("Method : "+value);
}
}
class Demo{
public static void main(String args[]){
MyClass.m();
}
}
//////////////////////////////////////////////////////////////////////
Q32
class MyClass{
static{
System.out.println("static block");
System.out.println("block :" +value);
value=200;
}
static int value=100;
static void m(){
System.out.println("Method : "+value);
}
}
class Demo{
public static void main(String args[]){
MyClass.m();
}
}
//////////////////////////////////////////////////////////////////
Q33
class MyClass{
static{
System.out.println("static block 1");
}
static{
System.out.println("static block 2");
}
static{
System.out.println("static block 3");
}
}
class Demo{
public static void main(String args[]){
new MyClass();
}
}
////////////////////////////////////////////////////////////////////////
Q34 Object Initilizer
================
class MyClass{
int value;
{
System.out.println("instance block");
}
MyClass(){
System.out.println("Constructor");
}
}
class Demo{
public static void main(String args[]){
new MyClass();
}
}
//////////////////////////////////////////////////////////////////
Q36 Example
class MyClass{
int value=100;
MyClass(){
System.out.println("Constructor "+value);
value=300;
}
{
System.out.println("block "+value);
value=200;
}
}
class Demo{
public static void main(String args[]){
MyClass c1=new MyClass();
System.out.println("Main : "+c1.value);
}
}
//////////////////////////////////////////////////////////////////
Q37 Example
class MyClass{
static{
System.out.print("1 ");
}
{
System.out.print("2 ");
}
MyClass(){
System.out.print("3 ");
}
void m1(){
System.out.print("4 ");
}
static void m2(){
System.out.print("5 ");
}
}
class Demo{
public static void main(String args[]){
MyClass c1=new MyClass();
c1.m1();
}
}
////////////////////////////////////////////////////////////////////
Q38 Example
class MyClass{
static{
System.out.print("1 ");
}
{
System.out.print("2 ");
}
MyClass(){
System.out.print("3 ");
}
void m1(){
System.out.print("4 ");
}
static void m2(){
System.out.print("5 ");
}
}
class Demo{
public static void main(String args[]){
MyClass c1=new MyClass();
MyClass c2=new MyClass();
}
}
/////////////////////////////////////////////////////////////////////
Method Overloading
/////////////////////////////////////////////////////////////////////
Q39 Error
=====
class MyClass{
void myMethod(){
System.out.println("myMethod()");
}
void myMethod(){
System.out.println("myMethod2()");
}
}
class Demo{
public static void main(String args[]){
MyClass c1=new MyClass();
c1.myMethod();
}
}
///////////////////////////////////////////////////////////////////////
Q40 Method Overloading
==================
class MyClass{
void myMethod(){
System.out.println("myMethod()");
}
void myMethod(int i){
System.out.println("myMethod(int)");
}
}
class Demo{
public static void main(String args[]){
MyClass c1=new MyClass();
c1.myMethod();
c1.myMethod(100);
}
}
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