Explore the world of programming using Java!
/** * Create a BookStack program and add the books and print the books. * Stack - Last In First Out. */ import java.util.Stack; public class BookStack { public static void main(String str[]) { Stack<String> bookStack = new Stack<String>() ; bookStack.push("Book1") ; bookStack.push("Book2") ; bookStack.push("Book3") ; System.out.println(bookStack.pop()); System.out.println(bookStack.pop()); System.out.println(bookStack.pop()); } }
/* * Welcome to CodersStack - HelloJavaBeginners.java */ public class HelloJavaBeginners { public static void main(String[] args) { System.out.println("Hello Java Beginners! Welcome to CodersStack"); } }
import java.util.Scanner; /** * * Celsius = (Fahrenheit -32)* (5.0/9) * */ public class FahrenheitToCelcius { public static void main(String[] args) { Scanner celsiusScanner = null ; try { celsiusScanner = new Scanner(System.in); System.out.print("Enter a degree in Fahrenheit: "); double inFahrenheit = celsiusScanner.nextDouble(); double celsius = (inFahrenheit - 32) * (5.0 / 9) ; System.out.println(String.format("%s Fahrenheit = %s Celsius", inFahrenheit , celsius)); }finally { celsiusScanner.close() ; } }
import java.io.BufferedWriter; import java.io.FileWriter; /** * * HtmlFileWriter * */ public class HtmlFileWriter { static String htmlTemplate = "<!DOCTYPE html><html>" + "<body style=\"background-color:white;\"><h1 style=\"color:blue;text-align:center;\">" + "Welcome to <REPLACE_HEADER> Web Page !!!</h1>" + "<P style=\"color:green;\"><REPLACE_PARAGRAPH></p>" + "<center><button style=\"color:red;\" type=\"button\"onclick=\"document.getElementById('myid').innerHTML = Date()\">Display Date and Time.</button><p id=\"myid\"></p></center>" + "</body></html>" ; public static void main(String str[]) throws Exception { writeToHtmlFile("Student Name", "Output") ; } public static void writeToHtmlFile(String name, String output) throws Exception { try (BufferedWriter br = new BufferedWriter(new FileWriter(String.format("C:\\javaoutput\\%s.html", name)))) { htmlTemplate = htmlTemplate.replaceAll("<REPLACE_HEADER>", name) ; htmlTemplate = htmlTemplate.replaceAll("<REPLACE_PARAGRAPH>", output) ; br.write(htmlTemplate); } System.out.println("Html output file generated"); } }
import java.text.SimpleDateFormat; import java.util.Date; /** * This is a simple example to display predefined activities of a week. * What you learn in this program? * * - The conditional statement : switch and break * - Simple methods and method signature * - Calling methods from other methods * - Java Date class to get today's date. * - Building your own simple weekly TimeTable * * * * -- Add your own activities for the week in the printTodaysActivities method. * -- Run the program each day to see the activities for the day. * * */ public class WeeklyTimeTable { public static void main(String str[]){ printTodaysActivities(dayOfTheMonth()) ; } public static void printTodaysActivities(String today){ switch(today){ case "Monday" : System.out.println("Monday activity") ; break ; case "Tuesday" : System.out.println("Tuesday activity") ; break ; case "Wednesday" : System.out.println("Wednesday activity") ; break ; case "Thursday" : System.out.println("Thursday activity") ; break ; case "Friday" : System.out.println("Friday activity") ; break ; case "Saturday" : System.out.println("Saturday activity") ; break ; case "Sunday" : System.out.println("Sunday activity") ; break ; } } public static String dayOfTheMonth() { Date today = new Date() ; SimpleDateFormat sdf = new SimpleDateFormat("EEEEE") ; String day = sdf.format(today) ; return day ; } }
/** * A class is a blueprint from which individual objects are created. * Sample Student Class java program * How to create objects? * Student student = new Student("My name","Grade1"); **/ public class Student { String grade ; String studentName ; public Student(String studentName, String grade){ this.studentName = studentName ; this.grade = grade ; } public String getGrade() { return grade; } public void setGrade(String gradeName) { this.grade = gradeName; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public static void main(String str[]) { Student student = new Student("Student1", "7th") ; System.out.println("Student Name " + student.getStudentName()); System.out.print("Student Grade " + student.getGrade()); } }
import java.util.LinkedList; import java.util.Queue ; /** * * Queue is First In First Out Data structure. * */ public class TicketQueue { public static void main(String str[]){ Queue<String> ticketQueue = new LinkedList<String>() ; ticketQueue.add("A") ; ticketQueue.add("B") ; ticketQueue.add("C") ; System.out.println(ticketQueue.poll()); System.out.println(ticketQueue.poll()); System.out.println(ticketQueue.poll()); } }
