CG Lab Source Codes
Java Programming Laboratory
1. a.Write a JAVA Program to demonstrate Constructor Overloading
and Method Overloading.b.Write a JAVA Program to implement Inner
class and demonstrate its Access protection.
2. Write a program in Java for String handling which performs
the following:i) Checks the capacity of StringBuffer objects.ii)
Reverses the contents of a string given on console and converts the
resultant string in upper case.iii) Reads a string from console and
appends it to the resultant string of ii.
3. a.Write a JAVA Program to demonstrate Inheritance.b. Simple
Program on Java for the implementation of Multiple inheritance
using interfaces to calculate the area of a rectangle and
triangle.
4. Write a JAVA program which hasi. A Class called Account that
creates account with 500Rs minimum balance, a deposit() method to
deposit amount, a withdraw() method to withdraw amount and also
throws LessBalanceException if an account holder tries to withdraw
money which makes the balance become less than 500Rs.ii. A Class
called LessBalanceException which returns the statement that says
withdraw amount ( Rs) is not valid.iii. A Class which creates 2
accounts, both account deposit money and one account tries to
withdraw more money which generates a LessBalanceException take
appropriate action for the same.
5. Write a JAVA program using Synchronized Threads, which
demonstrates Producer Consumer concept.
6. Write a JAVA program to implement a Queue using user defined
Exception Handling (also make use of throw, throws.).
7. Complete the following:1. Create a package named shape.2.
Create some classes in the package representing some common shapes
like Square, Triangle, and Circle.3. Import and compile these
classes in other program. 8. Write a JAVA Programa. Create an
enumeration Day of Week with seven values SUNDAY through SATURDAY.
Add a method is Workday( ) to the DayofWeek class that returns true
if the value on which it is called is MONDAY through FRIDAY. For
example, the call DayOfWeek.SUNDAY.isWorkDay ( ) returns false.
9. Write a JAVA program which hasi. A Interface class for Stack
Operationsii. A Class that implements the Stack Interface and
creates a fixed length Stack.iii. A Class that implements the Stack
Interface and creates a Dynamic length Stack.iv. A Class that uses
both the above Stacks through Interface reference and does the
Stack operations that demonstrates the runtime binding.
10. Write a JAVA program to print a chessboard pattern.
11. Write a JAVA Program which uses FileInputStream /
FileOutPutStream Classes.
12. Write JAVA programs which demonstrates utilities of
LinkedList Class.
13. Write a JAVA program which uses Datagram Socket for Client
Server Communication.
14. Write a JAVA applet program, which handles keyboard
event.1a)class Rectangle{int area,length,breadth;
Rectangle(){length=0;breadth=0;}
Rectangle(int length,int
breadth){this.length=length;this.breadth=breadth;}
Rectangle(Rectangle r){length=r.length;breadth=r.breadth;}
Rectangle(int a){length=breadth=a;}
void ComputeArea(){area=length*breadth;}
int ComputeArea(int lenc,int
brec){return((length+lenc)*(breadth+brec));}
int ComputeArea(Rectangle
r){return((length+r.length)*(breadth+r.breadth));}
void display(){System.out.println(area);}
public static void main(String args[]){int a;
Rectangle r=new Rectangle();Rectangle r1=new
Rectangle(5);Rectangle r2=new Rectangle(4,5);Rectangle r3=new
Rectangle(r2);
r.ComputeArea();r1.ComputeArea();r2.ComputeArea();r3.ComputeArea();
System.out.println("Area of all the Rectangles =");
r.display();r1.display();r2.display();r3.display();
System.out.println("Area of r2 with length and breadth
incremented by 2:"+r2.ComputeArea(2,2));System.out.println("Area of
r2 and r3:"+r2.ComputeArea(r3));}}
1b)class Outer{int out=1000;
public int outer_x=100;private int outer_y=200;protected int
outer_z=300;
void test(){Inner inner=new Inner();inner.display();}
class Inner{public int inner_x=1000;private int
inner_y=2000;protected int inner_z=3000;
void display(){System.out.println("Inside inner
class");System.out.println("outer_x:"+outer_x);System.out.println("outer_y:"+outer_y);System.out.println("outer_z:"+outer_z);System.out.println("outer_x:"+outer_x);System.out.println("outer_y:"+outer_y);System.out.println("outer_z:"+outer_z);}}}
class DemoInner{public static void main(String[] args){Outer
outer=new Outer();outer.test();}}
2)import java.util.Scanner;class Ex2{public static void
main(String args[]){StringBuffer sb=null;Scanner s=new
Scanner(System.in);sb=new
StringBuffer(s.next());System.out.println("String Buffer
Capacity:"+sb.capacity());StringBuffer sbr=sb.reverse();String
s1=new String(sbr);System.out.println("Reverse of given
String:"+sbr);sbr=new
StringBuffer(s1.toUpperCase());System.out.println("Upper case of
reverse String
"+sbr);sbr=sbr.append(s.next());System.out.println("String after
appending:"+sbr);}}
3a)class Box{double width;double height;double depth;
Box(Box ob){width=ob.width;height=ob.height;depth=ob.depth;}
Box(double w,double h,double
d){width=w;height=h;depth=d;}Box(){width=-1;height=-1;depth=-1;}
Box(double len){width=height=depth=len;}
double volume(){return width*height*depth;}}
class BoxWeight extends Box{double weight;
BoxWeight(double w,double h,double d,double
wt){super(w,h,d);weight=wt;}}
class DemoBoxWeight{public static void main(String
args[]){BoxWeight mybox1 = new BoxWeight(10,20,15,34.3);BoxWeight
mybox2 = new BoxWeight(2,3,4,0.076);double vol;
vol=mybox1.volume();System.out.println("Volume of mybox1 is :"
+vol);System.out.println("Weight of mybox1 is :"
+mybox1.weight);
vol=mybox2.volume();System.out.println("Volume of mybox2 is :"
+vol);System.out.println("Weight of mybox2 is :"
+mybox2.weight);}}
3b)interface TwoD{void calArea();}
class TwoDim{float s1,s2;float area;
void displayArea(){System.out.println("Area="+area);}}
class Triangle extends TwoDim implements TwoD{Triangle(int a,int
b){s1=a;s2=b;}
public void calArea(){area=0.5f*s1*s2;}}
class Rectangle extends TwoDim implements TwoD{Rectangle(int
a,int b){s1=a;s2=b;}
public void calArea(){area=s1*s2;}}
class Ex3b{public static void main(String args[]){Rectangle
r=new Rectangle(5,4);Triangle t=new Triangle(5,6);
r.calArea();t.calArea();
r.displayArea();t.displayArea();}}
4)import java.io.*;
class LessBalanceException extends Exception{double
amt;LessBalanceException(double
wamt){amt=wamt;System.out.println("withdraw not
possible"+amt);}}
class Account{public double bal;
Account(){bal=500.0;}
public void deposit(double damt){bal=bal+damt;}
public void withdraw(double wamt) throws
LessBalanceException{if((bal-wamt)r||r==-1){throw(new
QueueEmptyException());}else{return(a[f++]);}}
void display() throws
QueueEmptyException{if(f>r||r==-1)throw(new
QueueEmptyException());else{for(int i=f;i
