FIRST WEEK TERM WORK Program 1

1) Write a Java Program that implements a Queue using OOP concepts.

package Program1;

import java.util.*;

class Queue {
public int Q[];
public int top;
public int rear = 0;

Queue(int size) {
Q = new int[size];
top = -1;
rear = 0;
}

public void EnQueue(int item) {
if (top == Q.length - 1) {
System.out.println("Queue overflow");
} else {
Q[++top] = item;
System.out.println("EnQueue");
}
}

public int DeQueue() {
if (top < 0) {
System.out.println("Queue underflow");
return 0;
} else {
int a = Q[rear];
for (int i = 0; i < Q.length - 1; i++) {
Q[i] = Q[i + 1];
}
top--;
return a;
}
}

public void display() {
if (top < 0) {
System.out.println("Queue underflow");
}

for (int i = 0; i <= top; i++) {
System.out.println(Q[i]);
}
}

}

public class QueueOperation {

public static void main(String args[]) {
int m = 1;
Queue obj = new Queue(5);
Scanner input = new Scanner(System.in);
do {
System.out.println("QUEUE MENU");
System.out.println("Press 1 For EnQueue");
System.out.println("Press 2 For DeQueue");
System.out.println("Press 3 For Display");
System.out.println("Press 4 For Exit");
System.out.println("Enter the operation");
int Op = input.nextInt();
switch (Op) {
case 1:
System.out.print("Enter the Element u want insert");
int n = input.nextInt();
obj.EnQueue(n);
break;
case 2:
n = obj.DeQueue();
System.out.println("Element DeQueue:" + n);
break;
case 3:
obj.display();
break;
case 4:
System.out.println("Exit");
m = 0;
break;
default:
System.out.println("Enter Proper Input");
}
} while (m == 1);
}
}

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FIRST WEEK TERM WORK Program 3

3) Using the concept of interface, write a Java Program that calculates and prints the areas of triangle, square and rectangle.

package Program3;

interface shapes {

abstract void print();

abstract void calc();

}

class triangle implements shapes {

public int a, b, area;

triangle(int p, int q) {

a = p;

b = q;

}

public void calc() {

area = a * b;

}

public void print() {

System.out.println("Triangle area" + area);

}

}

class rectangle implements shapes {

public int a, b, area;

rectangle(int p, int q) {

a = p;

b = q;

}

public void calc() {

area = a * b;

}

public void print() {

System.out.println("Rectangle area" + area);

}

}

class square implements shapes {

public int a, area;

square(int p) {

a = p;

}

public void calc() {

area = a * a;

}

public void print() {

System.out.println("Square area" + area);

}

}

public class ShapesInterface {

public static void main(String args[]) {

shapes obj = new triangle(5, 10);

obj.calc();

obj.print();

obj = new rectangle(5, 10);

obj.calc();

obj.print();

obj = new square(5);

obj.calc();

obj.print();

}

}

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FIRST WEEK TERM WORK Program 2

2) Using the concept of abstract class and dynamic method dispatch, write a Java Program that calculates and prints the areas of triangle, square and rectangle. 

package Program2;

abstract class shapes {
abstract void print();

abstract void calc();
}

class triangle extends shapes {
public int a, b, area;

triangle(int p, int q) {
a = p;
b = q;
}

void calc() {

area = a * b;

}

void print() {
System.out.println("Triangle area" + area);
}

}

class rectangle extends shapes {
public int a, b, area;

rectangle(int p, int q) {
a = p;
b = q;
}

void calc() {

area = a * b;

}

void print() {
System.out.println("Rectangle area" + area);
}

}

class square extends shapes {
public int a, area;

square(int p) {
a = p;

}

void calc() {

area = a * a;

}

void print() {
System.out.println("Square area" + area);
}

}

public class ShapesAbstract {
public static void main(String args[]) {
shapes obj = new triangle(5, 10);
obj.calc();
obj.print();
obj = new rectangle(5, 10);
obj.calc();
obj.print();
obj = new square(5);
obj.calc();
obj.print();
}

}

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FIRST WEEK TERM WORK Program 4

4) “A Person has First Name, Last Name, Mobile Number & age. An Employee has Employee ID & Salary. Also, Employee IS-A Person.” Using the concept of inheritance, write a Java Program that displays all the attributes of Employee and Person for the given problem scenario.

package Program4;

class person {

String firstname, lastname;

double mobileno, age;

person(String fname, String lname, double n, double m) {

firstname = fname;

lastname = lname;

mobileno = n;

age = m;

}

void show() {

System.out.println("Firstname: " + firstname);

System.out.println("Lastname: " + lastname);

System.out.println("Mobile: " + mobileno);

System.out.println("Age: " + age);

}

}

class employee extends person {

double empid, Sal;

employee(String fname, String lname, double n, double m, double a, double b) {

super(fname, lname, n, m);

empid = a;

Sal = b;

}

void show() {

System.out.println("Firstname: " + firstname);

System.out.println("Lastname: " + lastname);

System.out.println("Mobile: " + mobileno);

System.out.println("Age: " + age);

System.out.println("empid:" + empid);

System.out.println("Sal:" + Sal);

}

}

public class Test {

public static void main(String args[]) {

person obj = new person("amit", "sharma", 8660, 20);

obj.show();

employee obj1 = new employee("amit", "sharma", 8660, 20, 1, 12000);

obj1.show();

}

}

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FIRST WEEK TERM WORK Program 5

5) Write a Java Program for the following problem scenario: Create a package named “BasicMath” which has a class named Basic and has methods to perform following computations: 

a. Addition of two numbers 

b. Subtraction of two numbers 

c. Multiplication of two numbers

d. Division of two numbers

 Create another package named “AdvancedMath” which has a class named Advanced and has methods to perform following computations: 

a. Find sine of an angle 

b. Find ab 

c. Find log10 of a number

 Create a class named TestDemo defined inside a default package. This class must invoke all the methods of Basic and Advanced classes.

Default Package(Main class):

import AdvanceMath.Advance;

import BasicMath.Basic;

public class TestDemo {

public static void main(String[] args) {

Basic obj = new Basic();

Advance obj1 = new Advance();

int a;

double d;

a = obj.add(4, 5);

System.out.println("Sum= " + a);

a = obj.sub(4, 5);

System.out.println("Sub= " + a);

a = obj.mult(4, 5);

System.out.println("mult= " + a);

a = obj.div(4, 5);

System.out.println("div= " + a);

d = obj1.sin(30);

System.out.println("Sin= " + d);

d = obj1.exppow(2, 3);

System.out.println("Pow= " + d);

d = obj1.log(10);

System.out.println("Log= " + d);

}

}

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