Java Program for Entry level students
Java Program for Entry level students.
1. Write a Java program to print Hello World.
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
2. Write a Java Program using Variables and Data Types.\
public class VariablesExample {
public static void main(String[] args) {
int age = 25;
double salary = 50000.5;
String name = "John";
System.out.println(name + " is " + age + " years old with a salary
of $" + salary);
}
}
3. Write a Java program that takes user input from the user.
import java.util.Scanner;
public class UserInputExample {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter your name: ");
String name = scanner.nextLine();
System.out.println("Hello, " + name + "!");
}
}
4. Write a Java Program using a Conditional statement (if-else).
public class ConditionalExample {
public static void main(String[] args) {
int number = -10;
if (number > 0) {
System.out.println("Number is positive.");
} else {
System.out.println("Number is Negative.");
}
}
}
5. Write a Java Program using "for Loop".
public class ForLoopExample {
public static void main(String[] args) {
for (int i = 1; i <= 5; i++) {
System.out.println("Iteration " + i);
}
}
}
6. Write a Java program that shows the use of Array.
public class ArrayExample {
public static void main(String[] args) {
int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
System.out.println(num);
}
}
}
7. Write a Java Program using the "Method".\
public class MethodExample {
public static void main(String[] args) {
greet("Alice");
greet("Bob");
}
static void greet(String name) {
System.out.println("Hello, " + name + "!");
}
}
8. Write a Java program using "File Handling".
import java.io.FileWriter;
import java.io.IOException;
public class FileWriteExample {
public static void main(String[] args) {
try {
FileWriter writer = new FileWriter("output.txt");
writer.write("Hello, File Handling!");
writer.close();
System.out.println("Data written to the file.");
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
}
}
}
9. Write a Java Program using 'String Manipulation'.
public class StringManipulation {
public static void main(String[] args) {
String text = "Hello, Java!";
System.out.println("Length: " + text.length());
System.out.println("Uppercase: " + text.toUpperCase());
System.out.println("Substring: " + text.substring(7));
}
}
10. Write a Java Program using the Switch statement.
public class SwitchExample {
public static void main(String[] args) {
int dayOfWeek = 2;
switch (dayOfWeek) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
// ... other cases ...
default:
System.out.println("Invalid day");
}
}
}
11. Write a Java Program for Math operation.
public class MathOperations {
public static void main(String[] args) {
int a = 10;
int b = 5;
System.out.println("Sum: " + (a + b));
System.out.println("Difference: " + (a - b));
System.out.println("Product: " + (a * b));
System.out.println("Quotient: " + (a / b));
}
}
12. Write a Java Program to print Random number.
import java.util.Random;
public class RandomNumber {
public static void main(String[] args) {
Random rand = new Random();
int randomNumber = rand.nextInt(10); // Generates a random number between 0 and 9
System.out.println("Random Number: " + randomNumber);
}
}
13. Write a Java Program to print current date and time.
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class DateTimeExample {
public static void main(String[] args) {
LocalDateTime now = LocalDateTime.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String formattedDateTime = now.format(formatter);
System.out.println("Current Date and Time: " + formattedDateTime);
}
}
14. Write a Java program to print list and Arraylist.
import java.util.ArrayList;
import java.util.List;
public class ListExample {
public static void main(String[] args) {
List<String> fruits = new ArrayList<>();
fruits.add("Apple");
fruits.add("Banana");
fruits.add("Orange");
System.out.println("Fruits: " + fruits);
}
}
15. Write a Java program to enter a number, and the program calculates and prints the factorial of that number using a recursive method.
import java.util.Scanner;
public class FactorialCalculator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a number to calculate its factorial: ");
int number = scanner.nextInt();
long factorial = calculateFactorial(number);
System.out.println("Factorial of " + number + " is: " + factorial);
}
static long calculateFactorial(int n) {
if (n == 0 || n == 1) {
return 1;
} else {
return n * calculateFactorial(n - 1);
}
}
}
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