Web

Development

Practical File

Submitted By: Submitted To:

Soumya Subhadarshi Behera Mrs. Chavvi Rana

B.Tech- CSE (5th Semester) Lect. CSE

1826

UIET, MD University

INDEX

Sr. No. Date Topis Signature and Remarks

1. Modulus Operator Description

2. Relational and Logical Operators

3 Do while and For Loop description

4. Parameterized Constructors

5. String Methods

6. Overloading Descriptions

7. Inheritance

8. Animal Interface

9. Exception Handlers

10. Writing inside a file

1. Modulus Operator Description class Remainder { public static void main (String args[]) { int i = 12; int j = 4; int k = 0; System.out.println("i is " + i); System.out.println("j is " + j); k = i % j; System.out.println("Its Remainder is " + k); } }

class Divisor { public static void main(String[] args) { int a = 10; int b = 2; if ( a % b == 0 ) { System.out.println(a + " is divisible by "+ b); } else { System.out.println(a + " is not divisible by " + b); } } }

2. Relational and Logical Operators class RelationalProgram { public static void main(String[] args) { //a few numbers int i = 3; int j = 4; int k = 4; System.out.println("Greater than..."); //greater than System.out.println(" i > j = " + (i > j)); //false System.out.println(" j > i = " + (j > i)); //true System.out.println(" k > j = " + (k > j)); //false(equal) //greater than or equal to System.out.println("Greater than or equal to..."); System.out.println(" i >= j = " + (i >= j)); //false System.out.println(" j >= i = " + (j >= i)); //true System.out.println(" k >= j = " + (k >= j)); //true //less than System.out.println("Less than..."); System.out.println(" i < j = " + (i < j)); //true System.out.println(" j < i = " + (j < i)); //false System.out.println(" k < j = " + (k < j)); //false //less than or equal to System.out.println("Less than or equal to..."); System.out.println(" i <= j = " + (i <= j)); //true System.out.println(" j <= i = " + (j <= i)); //false System.out.println(" k <= j = " + (k <= j)); //true //equal to System.out.println("Equal to..."); System.out.println(" i is equivalent to j = " + (i == j)); System.out.println(" k is equivalent to j = " + (k == j)); //not equal to System.out.println("Not equal to...");

System.out.println(" i not equal to j = " + (i != j)); //true System.out.println(" k not equal to j = " + (k != j)); //false } }

class ConditionalOperator { public static void main(String[] args) { int x = 2; int y = 20, result=0; boolean bl = true; if((x == 5) && (x < y)) { System.out.println("value of x is "+ x); } if((x == y) || (y > 1)) { System.out.println("value of y is greater than the value of x"); } result = bl ? x : y; System.out.println("The returned value is "+ result); } }

3. Do while and For loop presentation class DoWhile { public static void main(String[] args) { int count = 1; do { System.out.println("Count is: " + count); count++; } while (count < 11); } }

class ForLoop { public static void main(String[] args) {

for(int i = 1;i <= 10;i++) { for(int j = 1;j <= i;j++) { System.out.print(i); } System.out.println(); } } }

4. Parameterized Constructor class Cube { int len; int bdth; int ht; public int getVolume() { return (len * bdth * ht); } Cube() { len = 15; bdth = 15; ht = 15; } Cube(int l, int b, int h) { len = l; bdth = b; ht = h; }

public static void main(String[] args) { Cube cubeObj1, cubeObj2; cubeObj1 = new Cube(); cubeObj2 = new Cube(10, 20, 30); System.out.println("Volume of Cube is : " + cubeObj1.getVolume()); System.out.println("Volume of Cube is : " + cubeObj2.getVolume()); } }

5. String Methods import java.lang.*; class StrStartWith { public static void main(String[] args) { System.out.println("String start with example!"); String str = "Welcome to my Coding!!!"; String start = "Welcome"; System.out.println("Given String : " + str); System.out.println("Start with : " + start); if (str.startsWith(start)) { System.out.println("The given string is start with Welcome"); } else { System.out.println("The given string is not start with Welcome"); } } }

import java.lang.*; import java.io.*; class StringLength { public static void main(String[] args) throws IOException { System.out.println("String lenght example!"); BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter string:"); String str = bf.readLine(); int len = str.length(); System.out.println("String lenght : " + len); } }

import java.lang.*; class StringTrim { public static void main(String[] args)

{ System.out.println("String trim example!"); String str = " Hindustan"; System.out.println("Given String :" + str); System.out.println("After trim :" +str.trim()); } }

6.Overloading Methods and Constructors class OverloadDemo { void test() { System.out.println("No parameters"); } // Overload test for one integer parameter. void test(int a) { System.out.println("a: " + a); } // Overload test for two integer parameters. void test(int a, int b) { System.out.println("a and b: " + a + " " + b); } // overload test for a double parameter double test(double a) { System.out.println("double a: " + a); return a*a; } } class Overload

{ public static void main(String args[]) { OverloadDemo ob = new OverloadDemo(); double result; // call all versions of test() ob.test(); ob.test(11); ob.test(11, 2); result = ob.test(11.2); System.out.println("Result of ob.test(11.2): " + result); } }

7. Inheritance class Base { int a = 11; void show() { System.out.println(a); } } class Super extends Base { int a = 22; void show() { super.show(); System.out.println(a); } public static void main(String[] args) { new Super().show();

} }

8.executing speak() and eat() methods using animal interface interface IAnimal { public void speak(); } public class Cat implements IAnimal { public void speak() { System.out.println("Cat speaks meaown!!!"); } public static void main(String args[]) { Cat c = new Cat(); c.speak(); } } public class Dog implements IAnimal { public void speak() { System.out.println("Dog eats Cat!!!"); } public static void main(String args[]) { Dog d = new Dog(); d.speak(); } }

9. Exception handling import java.io.*; import java.util.*; class MyException extends Exception { private String ssb=""; public String getMessage(String s) { ssb=s; return ("you are not permitted to enter inside "+ ssb); } } class ExcepDemo { public static void main(String args[]) throws MyException,IOException { String temp=""; try { String str="Soumya Subhadarshi Behera"; System.out.println("Enter your name"); BufferedReader br= new BufferedReader(new InputStreamReader(System.in)); temp=br.readLine(); if(!temp.equals(str)) throw new MyException(); else System.out.println("Welcome to MDU"); } catch(MyException e) { System.err.println(e.getMessage(temp)); }

catch(Exception e) { System.err.println(e); } } }

10.Writing inside a file import java.lang.*; import java.io.*; class FileWrite { public static void main(String args[]) { try { FileWriter fstream = new FileWriter("KeyboardInput.txt"); BufferedWriter out = new BufferedWriter(fstream); BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Please enter string:"); String str = bf.readLine(); out.write(str); out.close(); } catch (Exception e) { System.err.println("Error: " + e.getMessage()); } } }