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Cycle-1

1st program-Default values

public class DefaultValues

{

byte b;

short s;

int i;

long l;

float f;

double d;

char c;

boolean bl;

public static void main(String[] args)

{

DefaultValues ob = new DefaultValues();

System.out.println("default value of byte is "+ob.b);

System.out.println("default value of short is "+ob.s);

System.out.println("default value of int is "+ob.i);

System.out.println("default value of long is "+ob.l);

System.out.println("default value of float is "+ob.f);

System.out.println("default value of double is "+ob.d);

System.out.println("default value of char is "+ob.c);

System.out.println("default value of boolean is "+ob.bl);

}

}

Cycle -2

// Linear search

import java.util.*;

class Lsearch

{

int n;

int a[];

int sr;

Lsearch(int n) // dynamic constructor

{

this.n=n;

a=new int[n];

sr=0;

}

void readData()

{

Scanner s =new Scanner(System.in);

System.out.println("Enter "+n+ "Elements");

for(int i=0;i<n;i++)

a[i]=s.nextInt();

System.out.println("Enter a search element :");

sr=s.nextInt();

}

void search()

{

int f=0;

for(int i=0;i<n;i++)

{

if(a[i]==sr)

f=1;

}

if(f==1)

System.out.println("The element is found ");

else

System.out.println("the element is not found ");

}

public static void main(String args[])

{

Scanner s=new Scanner(System.in);

System.out.println("Enter n value :");

int n=s.nextInt();

Lsearch l=new Lsearch(n);

l.readData();

l.search();

}

}

//RACERS

import java.util.*;

class Racers

{

int n;

int sp[]; //speed

float avg;

void readBikers()

{

Scanner s=new Scanner(System.in);

System.out.println("Enter No of Bikers :");

n=s.nextInt();

sp=new int[n];

int tot=0;

for(int i=0;i<n;i++)

{

System.out.println("Enter the speed of Racer"+(i+1)+" :");

sp[i]=s.nextInt();

tot=tot+sp[i];

}

avg=(float)tot/n;

}

void display()

{

for(int i=0;i<n;i++)

{

if(sp[i]>=avg)

System.out.println("Racer "+(i+1)+"is qualified ");

}

}

public static void main(String args[])

{

Racers r = new Racers();

r.readBikers();

r.display();

}

}

Matrix multiplication

import java.util.Scanner;

class MatrixMultiplication

{

public static void main(String args[])

{

int mat1row, mat1col, mat2row, mat2col,i,j,k,sum;

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number of rows of matrix1");

mat1row = sc.nextInt();

System.out.println("Enter the number columns of matrix 1");

mat1col = sc.nextInt();

System.out.println("Enter the number of rows of matrix2");

mat2row = sc.nextInt();

System.out.println("Enter the number of columns of matrix 2");

mat2col = sc.nextInt();

if(mat1col==mat2row)

{

int mat1[][] = new int[mat1row][mat1col];

int mat2[][] = new int[mat2row][mat2col];

int resMat[][] = new int[mat1row][mat2col];

System.out.println("Enter the elements of matrix1");

for ( i= 0 ; i< mat1row ; i++ )

{

for ( j= 0 ; j < mat1col ;j++ )

{

mat1[i][j] = sc.nextInt();

}

}

System.out.println("Enter the elements of matrix2");

for ( i= 0 ; i< mat2row ; i++ )

{

for ( j= 0 ; j < mat2col ;j++ )

{

mat2[i][j] = sc.nextInt();

}

}

System.out.println("matrix multiplication is ");

for ( i= 0 ; i< mat1row ; i++ )

{

for ( j= 0 ; j <mat2col ; j++)

{

sum=0;

for ( k= 0 ; k <mat2row; k++ )

{

sum +=mat1[i][k]*mat2[k][j] ;

}

resMat[i][j]=sum;

}

}

for ( i= 0 ; i< mat1row; i++ )

{

for ( j=0 ; j < mat2col;j++ )

{

System.out.print(resMat[i][j]+" ");

}

System.out.println();

}

}

else

{

System.out.print("multipication is not possible ");

}

}

}

Cycle-3

Program to overload constructors

import java.util.*;

public class Student

{

int rno;//memeber var

String name;

Student() // Deafault

{

System.out.println(" Default Construtor invoked");

rno=0;// s oject

name=" ";

}

Student(int rno,String name)//local varaibles// Parameter

{

System.out.println(" parameter Construtor invoked");

this.rno=rno;//s1.rno=rno;

this.name=name;//s1.name=name;

}

Student(Student sobj)//copy constructor

{

System.out.println(" Copy Construtor invoked");

rno=sobj.rno;// s2.rno=s1.rno;

name=sobj.name;//s2.name=s1.name

}

void putData()

{

System.out.println("Rollno :"+rno);

System.out.println("Name :"+name);

}

public static void main(String[] args)

{

Student s= new Student();// default

Student s1=new Student(102,"RAM");//parameter

Student s2 =new Student(s1);//copy

s.putData();

s1.putData();

s2.putData();

}

}

//program to illustrat the usage of this keyword

public class Rectangle

{

int len;

int bre;

Rectangle()

{

len=0;

bre=0;

}

Rectangle(int len,int bre)

{

this.len=len;

this.bre=bre;

}

void area()

{

System.out.println("The area of rectangle is :"+(len*bre));

}

public static void main(String args[])

{

Rectangle r= new Rectangle();// Default constructor

r.area();

Rectangle r1=new Rectangle(3,4);//parameter constructor

r1.area();

}

}

//Program to create class mechanism -cycle 3.1

import java.util.*;

public class Student

{

int rno;//memeber var

String name;

Student()

{

System.out.println("Construtor invoked");

rno=0;

name=" ";

}

void getData()

{

Scanner in=new Scanner(System.in);

System.out.println("Enter Roll no :");

rno=in.nextInt();

System.out.println("Enter Name :");

name=in.next();

}

void putData()

{

System.out.println("Rollno :"+rno);

System.out.println("Name :"+name);

}

public static void main(String[] args)

{

Student s= new Student();

s.getData();

s.putData();

}

}

//cycle 3.2

static variable

//class varaiables

//memory allocated first

//are shared all the object

//They are intialized only once

//the values will be changed durig the function call

static datatype variablname;

static int x;

int y;

static Methods

//memory alloacted first

//they can be called directly

//it will be under the class scope but not object scope

//it can access only static variables but not non static variables

public class staticDemo

{

int x;// non static;

static int y;// static var

staticDemo()// Constructor

{

x=10;

y=20;

}

void displayx()

{

System.out.println("x="+(++x));

}

static void display() // static Method

{

System.out.println("y="+(++y));

}

public static void main(String args[])

{

staticDemo obj1=new staticDemo();

staticDemo obj2=new staticDemo();

staticDemo obj3=new staticDemo();

System.out.println("OBJECT 1 :");

obj1.displayx();

display();

System.out.println("OBJECT 2 :");

obj2.displayx();

display();

System.out.println("OBJECT 3 :");

obj3.displayx();

display();

}

}