package day12;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.Date;
public class DateDemo {
public static void main(String[] args) {
Date date = new Date();
System.out.println(date);
LocalDate today = LocalDate.now();
System.out.println(today);
LocalDateTime now = LocalDateTime.now();
System.out.println(now);
}
} package day12;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
public class DateDemo2 {
public static void main(String[] args) {
// today's Date
LocalDate today = LocalDate.now();
// Expected format
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yy");
// Converting date to the format
String formattedDate = today.format(formatter);
System.out.println(formattedDate);
}
} package day12;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
public class DateDemo3 {
public static void main(String[] args) {
// Date in String format
String dateString = "2023-05-21";
// Format the DateString is In.
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
// Converting dateString to LocalDate
LocalDate parsedDate = LocalDate.parse(dateString, formatter);
System.out.println(parsedDate);
System.out.println(parsedDate.getYear());
System.out.println(parsedDate.getMonth());
System.out.println(parsedDate.getMonthValue());
System.out.println(parsedDate.getDayOfMonth());
}
} import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
public class DateDemo4 {
public static void main(String[] args) {
String dateStr = "2023/05/21";
// Expected in "yyyy-MM-dd" format, but it's in "yyyy/MM/dd" format.
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy/MM/dd");
try {
LocalDate parsedDate = LocalDate.parse(dateStr, formatter);
System.out.println(parsedDate);
} catch (Exception e) {
System.out.println("Failed to parse the date: " + e.getMessage());
e.printStackTrace();
}
}
} /**
*
*/
package day14.solved;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
public class DateDemo5 {
public static void main(String[] args) throws Exception {
LocalDate currentDate = LocalDate.now();
LocalDate journeyDate = LocalDate.parse("2023-06-14");
System.out.println("Todays Date :" + currentDate + ", Journey Date:" + journeyDate);
if (journeyDate.isBefore(currentDate)) {
throw new Exception("Journey Date cannot be less than current date");
}
LocalDate tatkalDate = currentDate.plusDays(1);
System.out.println("Note:Tatkal ticket can be booked on or before :" + tatkalDate);
if (tatkalDate.isBefore(journeyDate)) {
System.out.println("Tatkal ticket cannot be booked:" + journeyDate);
} else {
System.out.println("Tatkal Ticket booked for :" + journeyDate);
}
}
} package day12;
public class StringBuilderDemo {
public static void main(String[] args) {
String firstName = "Surya";
String lastName = "Umapathy";
StringBuilder fullName = new StringBuilder();
fullName.append(firstName);
fullName.append(" ");
fullName.append(lastName);
System.out.println(fullName);
}
} package day12;
public class StringBufferDemo {
public static void main(String[] args) {
String firstName = "Surya";
String lastName = "Umapathy";
StringBuffer fullName = new StringBuffer();
fullName.append(firstName).append(" ").append(lastName);
System.out.println(fullName);
}
} public class StringBuilderInsert {
public static void main(String[] args) {
StringBuilder builder = new StringBuilder("Hello World");
builder.insert(5, "Beautiful ");
System.out.println(builder.toString());
}
} public class StringBuilderReverse {
public static void main(String[] args) {
StringBuilder builder = new StringBuilder("Hello");
builder.reverse();
System.out.println(builder.toString());
}
} /**
* Class created for demonstrating appending with String builder
*
* @author BharathwajSoundarara
*
*/
public class StringBuilderLoopAppender {
public static void main(String[] args) {
// Program to demonstrate creating a String
// Appending a array of Strings
String[] strArr = { "This", "is", "a", "collection", "of", "words", "to",
"be", "appended", "to", "form", "a", "Sentence" };
// Without String Builder
String newStrFromSent = "";
for (String str: strArr ) {
// We are creating a new String everytime we do this
newStrFromSent += str + " ";
}
System.out.println(newStrFromSent.trim());
// GOOD Practice: With String Builder
StringBuilder strBuilderFromSent = new StringBuilder();
for (String str: strArr) {
// Just appending to an already existing object
strBuilderFromSent.append(str);
strBuilderFromSent.append(" ");
}
System.out.println(strBuilderFromSent.toString().trim());
}
}Import the Calculator package from day04 and use it to add two integers.
Write a Java program to display the current date and time using the LocalDateTime class.
Write a Java program to create a LocalDate object representing your birthday.
Write a Java program to calculate the number of days between two LocalDate objects.
Write a Java program that uses the Date class to print the current date and time in the following format: "Today's date is MM/DD/YYYY and current time is HH:MM:SS".
Write a program that takes a sentence as input from the user and reverses the order of the words in the sentence. The program should use StringBuilder to perform the reversal.
Example:
Input: "Hello, how are you?"
Output: "you? are how Hello,"
Insert a string at a specific position in a StringBuilder using the insert() method