Wednesday 12 April 2023
Beginner Level Java programs
Array Examples:
1. Program to find the sum of all elements in an array:
public class ArraySum {
public static void main(String[] args) {
int[] arr = {2, 4, 6, 8, 10};
int sum = 0;
for (int i = 0; i < arr.length; i++) {
sum += arr[i];
}
System.out.println("Sum of elements in array: " + sum);
}
}
2. Program to find the maximum element in an array:
public class ArrayMax {
public static void main(String[] args) {
int[] arr = {2, 4, 6, 8, 10};
int max = arr[0];
for (int i = 1; i < arr.length; i++) {
if (arr[i] > max) {
max = arr[i];
}
}
System.out.println("Maximum element in array: " + max);
}
}
3. Program to find the minimum element in an array:
public class ArrayMin {
public static void main(String[] args) {
int[] arr = {2, 4, 6, 8, 10};
int min = arr[0];
for (int i = 1; i < arr.length; i++) {
if (arr[i] < min) {
min = arr[i];
}
}
System.out.println("Minimum element in array: " + min);
}
}
4. Program to search for an element in an array:
public class ArraySearch {
public static void main(String[] args) {
int[] arr = {2, 4, 6, 8, 10};
int num = 8;
boolean found = false;
for (int i = 0; i < arr.length; i++) {
if (arr[i] == num) {
found = true;
break;
}
}
if (found) {
System.out.println(num + " found in array");
} else {
System.out.println(num + " not found in array");
}
}
}
5. Program to sort an array in ascending order:
public class ArraySort {
public static void main(String[] args) {
int[] arr = {10, 2, 8, 6, 4};
int temp;
for (int i = 0; i < arr.length; i++) {
for (int j = i + 1; j < arr.length; j++) {
if (arr[i] > arr[j]) {
temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
}
System.out.println("Sorted array in ascending order:");
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i] + " ");
}
}
}
For loop-based programs
6. Program to print the numbers from 1 to 10:
public class PrintNumbers {
public static void main(String[] args) {
for (int i = 1; i <= 10; i++) {
System.out.print(i + " ");
}
}
}
7. Program to print the even numbers from 1 to 20:
public class PrintEvenNumbers {
public static void main(String[] args) {
for (int i = 2; i <= 20; i += 2) {
System.out.print(i + " ");
}
}
}
8. Program to print the sum of the numbers from 1 to 100:
public class SumNumbers {
public static void main(String[] args) {
int sum = 0;
for (int i = 1; i <= 100; i++) {
sum += i;
}
System.out.println("Sum of numbers from 1 to 100: " + sum);
}
}
8. Program to print the multiplication table of a number:
import java.util.Scanner;
public class MultiplicationTable {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = input.nextInt();
for (int i = 1; i <= 10; i++) {
System.out.println(num + " x " + i + " = " + (num * i));
}
}
}
9. Program to print a right-angled triangle using asterisks:
import java.util.Scanner;
public class RightTriangle {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the height of the triangle: ");
int height = input.nextInt();
for (int i = 1; i <= height; i++) {
for (int j = 1; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}
}
}
While loop-based programs
10. Program to print the numbers from 1 to 10:
public class PrintNumbers {
public static void main(String[] args) {
int i = 1;
while (i <= 10) {
System.out.print(i + " ");
i++;
}
}
}
11. Program to print the sum of the numbers from 1 to 100:
public class SumNumbers {
public static void main(String[] args) {
int sum = 0;
int i = 1;
while (i <= 100) {
sum += i;
i++;
}
System.out.println("Sum of numbers from 1 to 100: " + sum);
}
}
12. Program to find the factorial of a number:
import java.util.Scanner;
public class Factorial {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number: ");
int num = input.nextInt();
int factorial = 1;
int i = 1;
while (i <= num) {
factorial *= i;
i++;
}
System.out.println("Factorial of " + num + " = " + factorial);
}
}
Do While loop-based programs
13. Program to print the sum of the numbers from 1 to 100:
public class SumNumbers {
public static void main(String[] args) {
int sum = 0;
int i = 1;
do {
sum += i;
i++;
} while (i <= 100);
System.out.println("Sum of numbers from 1 to 100: " + sum);
}
}
14. Program to ask the user for a password until it matches a predetermined password:
import java.util.Scanner;
public class Password {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String password = "password123";
String userPassword;
do {
System.out.print("Enter the password: ");
userPassword = input.nextLine();
} while (!userPassword.equals(password));
System.out.println("Password accepted!");
}
}
Class and object-based programs
15. Program to create a simple class and object:
public class MyClass {
int myVariable;
public static void main(String[] args) {
MyClass obj = new MyClass();
obj.myVariable = 10;
System.out.println(obj.myVariable);
}
}
16. Program to create a class with a constructor
public class Person {
String name;
int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public static void main(String[] args) {
Person person = new Person("John", 30);
System.out.println("Name: " + person.name);
System.out.println("Age: " + person.age);
}
}
17. Program to create a class with methods
public class Rectangle {
int length;
int width;
public Rectangle(int length, int width) {
this.length = length;
this.width = width;
}
public int area() {
return length * width;
}
public int perimeter() {
return 2 * (length + width);
}
public static void main(String[] args) {
Rectangle rect = new Rectangle(5, 7);
System.out.println("Area: " + rect.area());
System.out.println("Perimeter: " + rect.perimeter());
}
}
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