Java - Practice Questions

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Print Message

public class UserInterface {

    public static void main(String[] args) {
        // Fill your code here
        System.out.println("Thank you for your order");
    }
}

Sky Airlines

import java.util.Scanner;

public class UserInterface {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        // Fill your code here
        System.out.println("Enter name");
        String name = sc.next();
        
        System.out.println("Enter source");
        String source = sc.next();
        
        System.out.println("Enter destination");
        String dest = sc.next();
        
        System.out.println("Dear " + name + ", welcome onboard with service from " + source + " to " + dest + ". Thank you for choosing Sky Airlines. Enjoy your flight.");
    }
}

Swap two numbers

import java.util.Scanner;

public class UserInterface {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the numbers");
        int num1 = sc.nextInt();
        int num2 = sc.nextInt();
        
        System.out.println("Before swapping");
        System.out.println("first = " + num1 + ", second = " + num2);
        
        num1 = num1 ^ num2;
        num2 = num1 ^ num2;
        num1 = num1 ^ num2;
        
        System.out.println("After swapping");
        System.out.println("first = " + num1 + ", second = " + num2);
    }
}

Oxygen Plants

          import java.util.Scanner;
          public class UserInterface {
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter the length of the room(in m)");
int length = sc.nextInt();
if(length<=0){
System.out.println("Invalid length");
return;
}
System.out.println("Enter the breadth of the room(in m)");
int breadth = sc.nextInt();
if(breadth<=0){
System.out.println("Invalid breadth");
return;
}
System.out.println("Enter the plant area of a single plant(in cm2)");
int plantArea = sc.nextInt();
if (plantArea<=0){
System.out.println("Invalid plant area");
return;
}
int totalPlant = (((length*breadth*100*100)/plantArea)); while(totalPlant%10 != 0){
totalPlant--;
}
System.out.println("Total number of plants is "+totalPlant);
double totaloxygen = totalPlant * 0.9;
System.out.printf("Total oxygen production is %.2f", totaloxygen);
System.out.println(" litres");
}
}

BMI Calculator

import java.util.Scanner;
public class UserInterface {
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
//Fill the code here
System.out.println("Enter weight in kg");
double weight = sc.nextDouble();
System.out.println("Enter height in cm");
double height = sc.nextDouble();
double h = height/100;
h = h*h;
double bmi = weight/h;
System.out.printf("Your BMI is %.2f.", bmi);
if(bmi>25){
System.out.println(" You are overweight");
double reduce = bmi - 25;
System.out.printf("Reduce %.2f kg to be fit", reduce);
}
else if(bmi<18.5){
System.out.println(" You are underweight");
double reduce = 18.5 - bmi;
System.out.printf("Gain %.2f kg to be fit", reduce);
}
else{
System.out.println(" You are fit and healthy");
}
}
}

Sim Card

import java.util.Scanner;
public class UserInterface {
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the phone number");
long phno = sc.nextLong();
int oddSum = 0;
int evenSum = 0;
while(phno!=0){
int lastDigit = (int)phno%10;
if((lastDigit&1)==0){
evenSum+=lastDigit;
}
else{
oddSum+=lastDigit;
}
phno = phno/10;
}
if(evenSum>oddSum)
System.out.println("Sum of even is greater than sum of odd");
else if (oddSum>evenSum)
System.out.println("Sum of odd is greater than sum of even");
else
System.out.println("Sum of odd and even are equal");
}
}

Reverse and Expand

import java.util.Scanner;
public class UserInterface {
 public static void main(String[] args)
 {
 Scanner sc = new Scanner(System.in);
 //Fill the code here
 System.out.println("Enter the number");
 int num = sc.nextInt();

 String numS = Integer.toString(num);
 int len = numS.length();
 if(len<4){
 System.out.println(numS+" is an invalid number");
 return;
 }

 String r = "";
 int rev = 0;

 while(num!=0) {
 int ld = num%10;
 rev = rev*10 + ld;
 num = num/10;
 int tlen=len;
 int ans = 1;
 while(tlen!=1){
 ans = ans*10;
 tlen--;
 }
 int t = ld*ans;

 // r+=(ans!=1)?t+"+":t;
 if(t!=0){
 if(ans!=1){
 r+=t+"+";
 }
 else{
 r+=t;
 }
 }
 len--;

 }
 System.out.println("Reversed number is "+rev);
// r = r.substring(0,(r.length()-1));
 System.out.println(r);


 }
}

Magic goose

 import java.util.Scanner;
 public class UserInterface {
 public static void main(String[] args)
 {
 Scanner sc = new Scanner(System.in);
 //Fill the code here
 System.out.println("Enter the day");
 int days = sc.nextInt();

 if(days>30 || days<=0){
 System.out.println(days+" is invalid day");
 return;
 }

 int day1 = 0;
 int day2 = 1;
 int ans = 1;

 for(int i=0; i<days-1; i++){
 ans = day1+day2+day2;
 day1 = day2;
 day2 = ans;
 }
 System.out.printf("Number of eggs in %dth day is %d",days,day2);
 }
}

Lottery Winner

 import java.util.Scanner;
 public class UserInterface {
 public static void main(String[] args)
 {
 Scanner sc = new Scanner(System.in);
System.out.println("Enter the ticket Id");
 long id = sc.nextLong();

 System.out.println("Enter the unlucky code");
 int uc = sc.nextInt();

 int cnt=0;
 long tid = id;
 while(tid!=0) {
 int t = (int)tid%10;
 if(t==uc){
 cnt++;
 }
 tid=tid/10;
 }

 if(cnt==0)
 System.out.println(id+" is lucky ticket");
 else if(cnt<3)
 System.out.println(id+" is partially lucky");
 else
 System.out.println(id+" is unlucky ticket");

 }
}

Ludo King

import java.util.Scanner;
public class UserInterface
{
 public static void main(String[] args)
 {
 Scanner sc=new Scanner(System.in);
 //Fill code here
 System.out.println("Enter Alex points");
 int alex = sc.nextInt();
 if(alex<0 || alex>50){
 System.out.println(alex+" is an invalid number");
 return;
 }

 System.out.println("Enter Nikil points");
 int nikil = sc.nextInt();
 if(nikil<0 || nikil>50){
 System.out.println(nikil+" is an invalid number");
 return;
 }

 System.out.println("Enter Sam points");
 int sam = sc.nextInt();
 if(sam<0 || sam>50){
 System.out.println(sam+" is an invalid number");
 return;
 }
if((alex==nikil && alex==sam) || (alex==nikil || alex==sam)){
 System.out.println("The game is a tie");
 return;
 }

 if(alex>nikil && alex>sam) {
 System.out.println("Alex scored "+alex+" points and won the game");
 }
 else if(nikil>alex && nikil>sam){
 System.out.println("Nikil scored "+nikil+" points and won the game");
 }
 else{
 System.out.println("Sam scored "+sam+" points and won the game");
 }


 }
}

Student Details - Constructor (Student.java)

public class Student {

 // Fill the code
 private int studentId;
 private String studentName;
 private String studentAddress;
 private String collegeName;


 public Student(int studentId, String studentName, String studentAddress,
 String collegeName){
 this(studentId, studentName, studentAddress);
 this.collegeName = collegeName;
 }

 public Student(int studentId, String studentName, String studentAddress){

 this.studentId = studentId;
 this.studentName = studentName;
 this.studentAddress = studentAddress;
 collegeName = "NIT";

 }
public void setStudetnId(int studentId){
 this.studentId = studentId;
 }

 public void setStudetnName(String studentName){
 this.studentName = studentName;
 }

 public void setStudentAddress(String studentAddress){
 this.studentAddress = studentAddress;
 }

 public void setCollegeName(String collegeName){
 this.collegeName = collegeName;
 }

 // getters
 public int getStudentId(){
 return studentId;
 }

 public String getStudentName(){
 return studentName;
 }
public String getStudentAddress(){
 return studentAddress;
 }

 public String getCollegeName(){
 return collegeName;
 }

}

Student Details - Constructor (UserInterface.java)

import java.util.Scanner;
public class UserInterface {

 public static void getDetails(Student s) {

 System.out.println("Student id:"+s.getStudentId());
 System.out.println("Student name:"+s.getStudentName());
 System.out.println("Address:"+s.getStudentAddress());
 System.out.println("College name:"+s.getCollegeName());

 }

 public static void main(String[] arg)
 {
 Scanner sc = new Scanner(System.in);

 System.out.println("Enter Student's Id:");
 int stdId = sc.nextInt();

 System.out.println("Enter Student's Name:");
 String stdName= sc.next();

 System.out.println("Enter Student's address:");
 String stdAdd = sc.next();

 String stdBelon;
 while(true) {
System.out.println("Whether the student is from NIT(Yes/No):");
 stdBelon = sc.next();
 stdBelon = stdBelon.toLowerCase();

 if(stdBelon.equals("yes") || stdBelon.equals("no")){
 break;
 }
 else{
 System.out.println("Wrong Input");
 }
 }

 if(stdBelon.equals("no")){
 System.out.println("Enter the college name:");
 String stdCollege = sc.next();

 Student s1 = new Student(stdId, stdName, stdAdd, stdCollege);
 getDetails(s1);

 }
 else if(stdBelon.equals("yes")){
 Student s2 = new Student(stdId, stdName, stdAdd);
 getDetails(s2);

 }
 }
}

Volume calculator- Over Loading(UserInterface.java)

import java.util.Scanner;
public class UserInterface {

 public static void main(String[] arg)
 {
 // Fill the code
 Scanner sc = new Scanner(System.in);

 VolumeCalculator v1 = new VolumeCalculator();

 System.out.println("Enter the choice");
 System.out.println("1.Find Volume For Cylinder");
 System.out.println("2.Find Volume For Cuboid");
 int choice = sc.nextInt();

 if(choice==1){
 System.out.println("Enter the radius");
 double radius = sc.nextDouble();

 System.out.println("Enter the height");
 double height = sc.nextDouble();

 double volume = v1.calculateVolume(radius, height);
 System.out.printf("Volume of the Cylinder is %.2f", volume);
 }
 else if(choice==2) {
 System.out.println("Enter the length");
 int length = sc.nextInt();
System.out.println("Enter the breadth");
 int breadth = sc.nextInt();

 System.out.println("Enter the height");
 int height = sc.nextInt();

 double volume = v1.calculateVolume(length, breadth, height);
 System.out.printf("Volume of the Cuboid is %.2f", volume);
 }

 }
}

Volume calculator- Over Loading(VolumeCalculator.java)

public class VolumeCalculator {
 // Fill the code

 public double calculateVolume(double radius, double height) {
 return (3.14 * radius * radius * height);
 }

 public double calculateVolume(int length, int breadth, int height){
 return (length*breadth*height);
 }


}

Bloodworks Northwest (DonorDetails.java)

public class DonorDetails
{
 //Include Getters and Setters
 //Include five argument constructor
 private String name;
 private int age;
 private String gender;
 private String bloodGroup;
 private long phoneNumber;

 public DonorDetails(String name, int age, String gender, String bloodGroup, long phoneNumber){
 this.name = name;
 this.age = age;
 this.gender = gender;
 this.bloodGroup = bloodGroup;
 this.phoneNumber = phoneNumber;
 }

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }
public int getAge() {
 return age;
 }

 public void setAge(int age) {
 this.age = age;
 }

 public String getGender() {
 return gender;
 }

 public void setGender(String gender) {
 this.gender = gender;
 }

 public String getBloodGroup() {
 return bloodGroup;
 }

 public void setBloodGroup(String bloodGroup) {
 this.bloodGroup = bloodGroup;
 }

 public long getPhoneNumber() {
 return phoneNumber;
 }
public void setPhoneNumber(long phoneNumber) {
 this.phoneNumber = phoneNumber;
 }


}

Bloodworks Northwest (UserInterface.java)

import java.util.Scanner;
public class UserInterface
{
 public static void main(String args[])
 {

 Scanner sc =new Scanner(System.in);
 System.out.println("Enter the name");
 String name = sc.next();

 System.out.println("Enter the age");
 int age = sc.nextInt();

 System.out.println("Enter the gender");
 String gender = sc.next();

 sc.nextLine();

 System.out.println("Enter the blood group");
 // Scanner sc1 = new Scanner(System.in);
 String bloodGroup = sc.nextLine();

 System.out.println("Enter the phone no");
 long phno = sc.nextLong();

 DonorDetails d = new DonorDetails(name, age, gender, bloodGroup, phno);
 System.out.println("Name:"+d.getName());
 System.out.println("Age:"+d.getAge());
System.out.println("Name:"+d.getName());
 System.out.println("Age:"+d.getAge());
 System.out.println("Gender:"+d.getGender());
 System.out.println("Blood group:"+d.getBloodGroup());
 System.out.println("Phone no:"+d.getPhoneNumber());
 }
}

Movie Ticket – Static(Ticket.java)

public class Ticket
{
 // Fill the code

 private int ticketid;
 private int price;
 private static int availableTickets;


 public int getTicketid() {
 return ticketid;
 }

 public void setTicketid(int ticketid) {
 this.ticketid = ticketid;
 }

 public int getPrice() {
 return price;
 }

 public void setPrice(int price) {
 this.price = price;
 }

 public int getAvailableTickets() {
 return availableTickets;
 }
          
 public void setAvailableTickets(int availableTickets) {
 this.availableTickets = availableTickets; 
 }
   
public int calculateTicketCost(int nooftickets)
 {
 // Fill the code
 if(availableTickets>= nooftickets){
 int tot = nooftickets * price;
 availableTickets = availableTickets - nooftickets;
 return tot;
 }
 return -1;
 }

}

Movie Ticket – Static(UserInterface.java)

import java.util.Scanner;
public class UserInterface {

 public static void main(String[] arg)
 {
 // Fill the code
 Scanner sc = new Scanner(System.in);
 System.out.println("Enter movie name");
 String movieName = sc.next();

 System.out.println("Enter no of bookings");
 int n = sc.nextInt();

 System.out.println("Enter the available tickets");
 int availableTickets = sc.nextInt();
 Ticket ticket = new Ticket();
 ticket.setAvailableTickets(availableTickets);

 while(n!=0) {
 n-=1;

 System.out.println("Enter the ticketid");
 int id = sc.nextInt();
 ticket.setTicketid(id);

 System.out.println("Enter the price");
 int price = sc.nextInt();
 ticket.setPrice(price);
int avT = ticket.getAvailableTickets();
 System.out.println("Enter the no of tickets");
 int noOfT = sc.nextInt();
 System.out.println("Available tickets: "+avT);
 if(noOfT>avT) {
 System.out.println("Tickets are not available");
 continue;
 }
 // ticket.setAvailableTickets(availableTickets - noOfT
 int amount = ticket.calculateTicketCost(noOfT);

 // output
 // avT = ticket.getAvailableTickets();
 // System.out.println("Available tickets: "+avT);
 System.out.println("Total amount: "+amount);
 // ticket.setAvailableTickets(avT - noOfT);
 avT = ticket.getAvailableTickets();
 if(avT==0){
 System.out.println("House full");
 return;
 }
 else{
 System.out.println("Available ticket after booking:"+avT);
 }
 // n-=1;

 }
}
}

Date Validation - Use SimpleDateFormat

import java.util.Scanner;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.text.ParseException;
public class UserInterface {

 public static void main(String[] args) {
 Scanner sc=new Scanner(System.in);
 System.out.println("Enter the date");
 String dateS = sc.next();

 SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
 dateFormat.setLenient(false);
 try{
 dateFormat.parse(dateS);
 System.out.println(dateS+" is a valid date");

 }catch(ParseException pe) {
 System.out.println(dateS+" is not a valid date");
 }
 }
}

Calculate Expiry Date - Use Calendar

import java.util.Scanner;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
import java.text.ParseException;
public class UserInterface {

 public static void main(String[] args) {
 Scanner sc=new Scanner(System.in);

 System.out.println("Enter the Manufacturing Date");
 String manuDate = sc.next();


 SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
 dateFormat.setLenient(false);

 try {
 Date date = dateFormat.parse(manuDate);

 System.out.println("Enter the Month");
 int month = sc.nextInt();

 Calendar c = Calendar.getInstance();
 c.setTime(date);

 c.add(c.MONTH, month);
Date expiryDate = c.getTime();

 String formatExpiry = dateFormat.format(expiryDate);
 System.out.println(formatExpiry+" is the expiry date");

 }catch(ParseException pe) {
 System.out.println(manuDate+" is not a valid date");
 }


 }
}

Sum of Max

import java.util.Scanner;
public class UserInterface{

 public static void main(String[] args){

 Scanner sc=new Scanner(System.in);

 //Fill the code here
 System.out.println("Enter the array size");
 int size = sc.nextInt();

 if(size%2==1){
 System.out.println(size+" is an odd number. Please enter even number");
 return;
 }

 else if(size<=0){
 System.out.println(size+" is an invalid array size");
 return;
 }

 System.out.println("Enter the number");

 int arr[] = new int[size];
 int maxi = Integer.MIN_VALUE;
 int mini = Integer.MAX_VALUE;
 for(int i=0; i<size; i++) {
arr[i] = sc.nextInt();
 if(arr[i]>maxi){
 maxi = arr[i];
 }
 if(arr[i]<mini){
 mini = arr[i];
 }
 }
 maxi = maxi + mini;
 System.out.println("The maximum number is "+maxi);

 }
}

Subset or not

import java.util.Scanner;
public class UserInterface{

 public static void main(String[] args){

 Scanner sc=new Scanner(System.in);

 System.out.println("Enter the first array size");
 int arr1Size = sc.nextInt();

 if(arr1Size<=0){
 System.out.println(arr1Size+" is an invalid array size");
 return;
 }

 System.out.println("Enter the numbers");
 int arr1[] = new int[arr1Size];

 for(int i=0; i<arr1Size; i++) {
 arr1[i] = sc.nextInt();
 }
 //first array finish

 System.out.println("Enter the second array size");
 int arr2Size = sc.nextInt();
if(arr2Size<=0){
 System.out.println(arr2Size+" is an invalid array size");
 return;
 }

 if(arr2Size>arr1Size) {
 System.out.println(arr2Size+" is an invalid size as it is greater than first array size "+arr1Size);
 return;
 }

 System.out.println("Enter the numbers");
 int arr2[] = new int[arr2Size];

 for(int i=0; i<arr2Size; i++) {
 arr2[i] = sc.nextInt();
 }

 int cnt = 0;
 for(int i=0; i<arr2Size; i++){
 for(int j=0; j<arr1Size; j++){
 if(arr2[i]==arr1[j]){
 cnt+=1;
 }
 }
 }
if(cnt==arr2Size) {
 System.out.println("Array2 of size "+arr2Size+" is a subset of array1");
 }
 else {
 System.out.println("Array2 of size "+arr2Size+" is not a subset of array1");
 }
 }
}

Prime Number Game

import java.util.Scanner;
public class UserInterface {
 public static void main(String[]args)
 {
 Scanner sc=new Scanner(System.in);

 System.out.println("Enter the size of first array");
 int arr1Size = sc.nextInt();

 if(arr1Size<=0){
 System.out.println(arr1Size+" is an invalid array size");
 return;
 }

 System.out.println("Enter the array elements");
 int []arr1 = new int[arr1Size];
 for(int i=0; i<arr1Size; i++) {
 arr1[i] = sc.nextInt();
 if(arr1[i]<0){
 System.out.println(arr1[i]+" is an invalid input");
 return;
 }
 }


 System.out.println("Enter the size of second array");
 int arr2Size = sc.nextInt();
if(arr2Size<=0){
 System.out.println(arr2Size+" is an invalid array size");
 return;
 }


 int []arr2 = new int[arr2Size];

 if(arr2Size!=arr1Size) {
 System.out.println("Both array size is different");
 return;
 }

 System.out.println("Enter the array elements");
 for(int i=0; i<arr2Size; i++) {
 arr2[i] = sc.nextInt();
 if(arr2[i]<0){
 System.out.println(arr2[i]+" is an invalid input");
 return;
 }
 }

 int lastDigit = 0;
 for(int i=0; i<arr1Size; i++) {
 int sum = arr1[i] + arr2[i];
 lastDigit += sum%10;
 }
boolean flag = false;
 for(int i=2; i*i<lastDigit; i++){
 if(lastDigit%i==0){
 flag = true;
 break;
 }
 }
 if(flag) {
 System.out.println(lastDigit+" is not a prime number");
 }
 else {
 System.out.println(lastDigit+" is a prime number");
 }



 }
}

Magic Sum

import java.util.Scanner;
public class UserInterface{

 public static boolean isPrime(int n){
 for(int i=2; i<n; i++) {
 if(n%i==0) {
 return false;
 }
 }
 return true;
 }

 public static void main(String[] args){

 Scanner sc=new Scanner(System.in);

 System.out.println("Enter the array size");
 int size = sc.nextInt();

 if(size<1 || size>5){
 System.out.println(size+" is an invalid array size");
 return;
 }

 int []arr = new int[size];
 System.out.println("Enter the numbers");
for(int i=0; i<size; i++) {
 arr[i] = sc.nextInt();
 if(arr[i]<=0 || arr[i]>=100){
 System.out.println(arr[i]+" is an invalid input");
 return;
 }
 }


 int arr2[] = new int[size];
 int cnt=0;
 for(int i=0; i<size; i++) {
 boolean prime = isPrime(arr[i]);
 if(prime) {
 int sum=0;
 for(int j=2; j<arr[i]; j++) {
 if(isPrime(j)){
 sum+=j;
 if(sum==arr[i]){
 if(cnt==0){
 System.out.println("The sum of prime numbers is");
 }
 System.out.println(sum);
 cnt+=1;
 break;
 }
 }
}
 }
 }

 if(cnt==0){
 System.out.println("The "+size+" numbers are not sum of prime numbers");
 }


 }
}

PIN Number

import java.util.Scanner;
public class UserInterface{


 public static boolean isComposite(int n) {
 if(n%2==0 && n>2){
 return true;
 }
 for(int i=3; i<n; i++){
 if(n%i==0){
 return true;
 }
 }
 return false;
 }

 public static boolean isPrime(int n) {
 for(int i=2; i<n; i++){
 if(n%i==0){
 return false;
 }
 }
 return true;
 }

 public static void main(String[] args){
Scanner sc=new Scanner(System.in);

 System.out.println("Enter the total number of PIN numbers");
 int noOfPins = sc.nextInt();

 if(noOfPins<=0) {
 System.out.println(noOfPins+" is an invalid number");
 return;
 }

 String arr[] = new String[noOfPins];
 System.out.println("Enter the PIN numbers");
 for(int i=0; i<noOfPins; i++) {
 arr[i] = sc.next();
 if(arr[i].length()!=4){
 System.out.println(arr[i]+" is an invalid PIN number");
 return;
 }
 }

 boolean isValid = false;
 for(int i=0; i<noOfPins; i++) {
 int pin = Integer.parseInt(arr[i]);
 int tpin = pin;
 int compositeNo = pin%10;
 boolean composite = isComposite(compositeNo);
pin = pin/10;

 int primeNo = pin%10;
 pin = pin/10;
 boolean prime = isPrime(primeNo);

 int evenNo = pin%10;
 pin = pin/10;
 boolean even = evenNo%2==0?true:false;

 int oddNo = pin%10;
 pin = pin/10;
 boolean odd = oddNo%2==1?true:false;

 if(odd && even && prime && composite) {
 if(!isValid)
 System.out.println("Valid PIN numbers are");
 System.out.println(tpin);
 isValid = true;
 }


 }
 if(!isValid) {
 System.out.println("All these "+noOfPins+" numbers are not a valid PIN number");
 }
}
}

Two arrays game

import java.util.Scanner;
public class UserInterface{

 public static void main(String[] args){

 Scanner sc=new Scanner(System.in);

 System.out.println("Enter the size for the first array");
 int size1 = sc.nextInt();

 if(size1<=0){
 System.out.println(size1+" is an invalid array size");
 return;
 }

 int []arr1 = new int[size1];
 System.out.println("Enter the elements for the first array");
 for(int i=0; i<size1; i++) {
 arr1[i] = sc.nextInt();
 }
 //array 1 ends here

 System.out.println("Enter the size for the second array");
 int size2 = sc.nextInt();

 if(size2<=0){
 System.out.println(size2+" is an invalid array size");
return;
 }


 int []arr2 = new int[size2];
 System.out.println("Enter the elements for the second array");
 for(int i=0; i<size2; i++) {
 arr2[i] = sc.nextInt();
 }
 if(size1!=size2) {
 System.out.println("Both array size are not same");
 return;
 }
 // arr2 ends here

 System.out.println("The elements of the third array");
 for(int i=0; i<size1; i++) {
 if(i%2==0 || arr1[i]==0 || arr2[i]==0){
 System.out.println(arr1[i]+arr2[i]);
 }
 else if(i%2==1){
 System.out.println(arr1[i]-arr2[i]);
 }
 }


 }
}

Simple Addition - Varargs

import java.util.Scanner;
public class UserInterface
{
 public static int addition(int... a){
 int sum=0;
 int cnt=0;
 for(int i:a){
 cnt+=1;
 sum+=i;
 }
 System.out.println("Number of arguments is "+cnt);
 return sum;
 }
 public static void main(String args[])
 {
 Scanner sc =new Scanner(System.in);
 int sum = addition(10,15);
 System.out.println("Total "+sum);
 sum = addition(10, 20, 30);
 System.out.println("Total "+sum);
 sum = addition(10, 30, 60, 100, 5, 15);
 System.out.println("Total "+sum);

 }
}

Happy Mart - Arrays Class (Product.java)

public class Product {
 public int productId;
 public String productName;
 public double price;

 //Include three argument constructor to initialize values
 public Product(int productId, String productName, double price){
 this.productId = productId;
 this.productName = productName;
 this.price = price;
 }
 public String toString()
 {
 return productId+" "+productName+" "+price;

 }

}

Happy Mart - Arrays Class (SortById.java)

import java.util.Comparator;
public class SortById implements Comparator<Product> {
 public int compare(Product a, Product b){
 return a.productId - b.productId;
 }
}

Happy Mart - Arrays Class (SortByPrice.java)

import java.util.Comparator;
public class SortByPrice implements Comparator<Product>{
 public int compare(Product a, Product b) {
 return (int)a.price-(int)b.price;
 }
}

Happy Mart - Arrays Class (UserInterface.java)

import java.util.Scanner;
import java.util.List;
import java.util.Collections;
import java.util.ArrayList;
public class UserInterface {
 public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);

 System.out.println("Enter the products count");
 int productCnt = sc.nextInt();
 if(productCnt<=0){
 System.out.println("Invalid count");
 return;
 }

 System.out.println("Enter Product details");
 List<Product> productList = new ArrayList<>();

 for(int i=0; i<productCnt; i++) {
 String s = sc.next();
 String arr[] = s.split(":");
 int id = Integer.parseInt(arr[0]);
 String name = arr[1];
 double price = Double.parseDouble(arr[2]);
productList.add(new Product(id, name, price));

 }

 System.out.println("1.Sort By Id");
 System.out.println("2.Sort By Price");
 System.out.println("Enter your choice");
 int choice = sc.nextInt();


 switch(choice) {
 case 1:
 Collections.sort(productList, new SortById());
 System.out.println("After Sorting By Id");
 break;

 case 2:
 Collections.sort(productList, new SortByPrice());
 System.out.println("After Sorting By Price");
 break;

 default:
 System.out.println("Invalid choice");
 return;
 }

 for(Product p:productList){
System.out.println(p);
 }

 }
}

Resort booking

import java.util.Scanner;
public class UserInterface {
 public static void main(String args[])
 {
 //fill the code here
 Scanner sc=new Scanner(System.in);
 System.out.println("Enter the customer details");
 String details = sc.next();

 // extracting customer details
 String detailsArr[] = details.split(":");

 // conversion
 String name = detailsArr[0];
 int adultCnt = Integer.parseInt(detailsArr[1]);
 int childCnt = Integer.parseInt(detailsArr[2]);
 int daysCnt = Integer.parseInt(detailsArr[3]);

 // verifying input
 if(adultCnt<0){
 System.out.println("Invalid input for number of adults");
 return;
 }

 if(childCnt<0){
 System.out.println("Invalid input for number of children");
return;
 }

 if(childCnt<0){
 System.out.println("Invalid input for number of children");
 return;
 }

 if(daysCnt<=0){
 System.out.println("Invalid input for number of days");
 return;
 }

 int totalCost = adultCnt!=0?adultCnt*daysCnt*1000:0;
 totalCost+= childCnt!=0?childCnt*daysCnt*650:0;

 System.out.println(name+" your booking is confirmed and the total cost is "+totalCost);

 }
}

Travel Agency

import java.util.Scanner;
public class UserInterface{

 public static void main(String[] args){

 Scanner sc=new Scanner(System.in);

 String cities[] = {"Chennai", "Coimbatore", "Erode", "Karur", "Madurai", "Hyderabad", "Salem", "Bangalore", "Delhi", "Agra"};

 System.out.println("Enter the city name");
 String cityName = sc.next();

 String available = "not ";
 for(int i=0; i<cities.length; i++){
 if(cities[i].equalsIgnoreCase(cityName)){
 available="";
 }
 }
 System.out.println("Bus for "+cityName+" is "+available+"available");

 }
}

Complete the Caption

import java.util.Scanner;
public class UserInterface {


 public static boolean isValidString(String s){
 return s.matches("[a-zA-Z! ]+");
 }

 public static void main(String[] args){
 Scanner sc=new Scanner(System.in);
 //fill the code here
 System.out.println("Enter the first string");
 String s1 = sc.nextLine();

 System.out.println("Enter the second string");
 String s2 = sc.nextLine();

 if(s1.length()!=s2.length()){
 System.out.println("Length of the strings "+s1+" and "+s2+" does not match");
 return;
 }

 boolean isValidStr1 = isValidString(s1);
 boolean isValidStr2 = isValidString(s2);

 if(!isValidStr1 && !isValidStr2){
 System.out.println(s1+" and "+s2+" contains invalid symbols");
}
 else if(!isValidStr1) {
 System.out.println(s1+" contains invalid symbols");
 }
 else if(!isValidStr2){
 System.out.println(s2+" contains invalid symbols");
 }
 else{
 StringBuilder result = new StringBuilder();
 for(int i=0; i<s1.length(); i++) {
 if(s1.charAt(i)=='!'){
 result.append(s2.charAt(i)+"");
 }
 else{
 result.append(s1.charAt(i)+"");
 }
 }
 System.out.println(result);
 }



 }
}

Fishing competition

import java.util.Scanner;
public class UserInterface
{
 public static void main(String args[])
 {

 Scanner sc =new Scanner(System.in);
 //Fill the code

 System.out.println("Enter the details");
 String details = sc.next();

 String[] detailsArr = details.split(":");

 String name = detailsArr[0];
 int age = Integer.parseInt(detailsArr[1]);
 int bigFish = Integer.parseInt(detailsArr[2]);
 int mediumFish = Integer.parseInt(detailsArr[3]);
 int smallFish = Integer.parseInt(detailsArr[4]);

 if(age<18) {
 System.out.println(age+" is an invalid age");
 return;
 }

 if(bigFish<0) {
 System.out.println(bigFish+" is an invalid input");
return;
 }
 if(mediumFish<0) {
 System.out.println(mediumFish+" is an invalid input");
 return;
 }
 if(smallFish<0) {
 System.out.println(smallFish+" is an invalid input");
 return;
 }

 int totalPoints = bigFish!=0?(bigFish*10):0;
 totalPoints+= mediumFish!=0?(mediumFish*6):0;
 totalPoints+= smallFish!=0?(smallFish*3):0;

 System.out.println(name+" scored "+totalPoints+" points");


 }

}

Employee ID Generation

import java.util.Scanner;
import java.util.HashMap;
public class UserInterface
{
 public static void main(String args[])
 {

 Scanner sc =new Scanner(System.in);
 //Fill the code
 System.out.println("Enter the training id");
 String id = sc.next();

 if(id.length()!=9) {
 System.out.println(id+" is an invalid training id");
 return;
 }
 String year = id.substring(0,4);
 if(!year.equals("2021")){
 System.out.println(year+" is an invalid year");
 return;
 }

 String teamCode = id.substring(4,6);
 HashMap<String, String> map = new HashMap<>();
 map.put("01", "LP");
 map.put("02", "TA");
 map.put("03", "CT");
map.put("04", "PT");
 map.put("05", "TT");

 if(!map.containsKey(teamCode)){
 System.out.println(teamCode+" is an invalid team code");
 return;
 }



 String rollNo = id.substring(6,9);
 int rollNoInt = Integer.parseInt(rollNo);

 if(rollNoInt<1 || rollNoInt>999) {
 System.out.println(rollNo+" is an invalid roll number");
 return;
 }

 String employeeId = "SIET";
 employeeId+=map.get(teamCode);
 employeeId+=rollNo;

 System.out.println("Employee Id: "+employeeId);

 }

}

Swap and Reverse

import java.util.Scanner;
public class UserInterface
{
 public static void main(String args[])
 {

 Scanner sc =new Scanner(System.in);
 //Fill the code
 System.out.println("Enter the sentence");
 String sentence = sc.nextLine();

 String senArr[] = sentence.split(" ");
 if(senArr.length<=2){
 System.out.println("Invalid Length");
 return;
 }

 if(!sentence.matches("[a-zA-Z ]+")){
 System.out.println(sentence+" is an invalid sentence");
 return;
 }

 String res = senArr[senArr.length-1];
 res+=" ";

 for(int i=senArr.length-2; i>0; i--) {
 StringBuilder rev = new StringBuilder();
rev.append(senArr[i]);
 rev.reverse();
 res+=rev;
 res+=" ";
 }
 res+=senArr[0];
 System.out.println(res);


 }

}

Profile Update

import java.util.Scanner;
public class UserInterface
{
 public static void main(String[] args)
 {
 Scanner sc=new Scanner(System.in);
 //Fill code here
 System.out.println("Enter your name");
 String name = sc.next();

 System.out.println("Enter your PAN number");
 String pan = sc.next();

 String panPattern = "[A-Z]{5}[0-9]{4}[A-Z]{1}";

 if(!pan.matches(panPattern)){
 System.out.println(pan+" is an invalid PAN number");
 return;
 }

 System.out.println("Enter your E-mail ID");
 String email = sc.next();

 String emailPattern = "[a-z]{5,10}@digitec\\.com";

 if(!email.matches(emailPattern)){
 System.out.println("Invalid E-mail ID");
 return;
}
 System.out.println("Profile of "+name+" updated successfully");

 }
}

Event ID Validation

import java.util.Scanner;
public class UserInterface
{
 public static void main(String[] args)
 {
 Scanner sc=new Scanner(System.in);
 System.out.println("Enter your name");
 String name = sc.next();

 System.out.println("Enter your ID");
 String id = sc.next();
 String pattern = "SPC(\\d{3})(0[1-9]|1[0-2])(AM|PM)";
 if(!id.matches(pattern)){
 System.out.println(id+" is an Invalid ID");
 return;
 }
 String seatStr = id.substring(3,6);
 int seatNo = Integer.parseInt(seatStr);
 String eventClock = id.substring(6,8);
 int eventClockInt = Integer.parseInt(eventClock);
 String eventD = id.substring(8,10);
 System.out.println("Hi "+name+" your seat number is "+seatNo+" and the event starts at "+eventClockInt+eventD);


 }
}

Password Validator

import java.util.Scanner;
public class UserInterface
{
 public static void main(String[] args)
 {
 Scanner sc=new Scanner(System.in);
 System.out.println("Generate your password");
 String pass = sc.next();

 String pattern = "(?=.*[A-Z])(?=.*[a-z])(?=.*[@$*#]).{6,12}";

 if(!pass.matches(pattern)){
 System.out.println(pass+" is an invalid password");
 return;
 }

 int upperCnt = 0;
 int lowerCnt = 0;
 int digitCnt=0;
 int specialCnt = 0;

 for(int i=0; i<pass.length(); i++){
 char t = pass.charAt(i);
 if(t>='A' && t<='Z'){
 upperCnt+=1;
 }
 
else if(t>='a' && t<='z'){
 lowerCnt+=1;
 }
 else if(t>='0' && t<='9'){
 digitCnt+=1;
 }
 else{
 specialCnt+=1;
 }
 }

 System.out.println("The generated password "+pass+" is valid and has "+lowerCnt+" lowercase alphabet " +upperCnt+" uppercase alphabet "+specialCnt+" special character " +digitCnt+" digit");

 }
}

Java - Practice Questions

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