HomeInterviewinterview program javaBasic interview programs in java part 1

Basic interview programs in java part 1

Nowadays in any interview, a programming test is a must, So here we are creating a series of basic interview programs in java, We learn step by step

Program to Accept values of Two Numbers and print their Addition

package com.onurdesk.basic.interview.programs;

import java.util.Scanner;

class AddNumbers {
	public static void main(String args[]) {
		int x, y, z;
		System.out.print("Enter two integers to calculate their sum : ");
		Scanner in = new Scanner(System.in);
		x = in.nextInt();
		y = in.nextInt();
		z = x + y;
		System.out.println("Sum of entered integers = " + z);
		System.out.println("Thank you for reading basic interview programs in java");

	}
}
basic interview programs in java 
sum of two number

Program to Accept value of Radius and Calculate Area of Circle.

package com.onurdesk.basic.interview.programs;

class CalculateCircleAreaOnurdeskExample {

	public static void main(String[] args) {

		int radius = 3;
		System.out.println("The radius of the circle is " + radius);

		/*
		 * Area of a circle is pi * r * r where r is a radius of a circle.
		 */

		// NOTE : use Math.PI constant to get value of pi
		double area = Math.PI * radius * radius;

		System.out.println("Area of a circle is " + area);
		System.out.println("Thank you for reading basic interview programs in java");

	}
}
basic interview programs in java calculate area of circle

Program to Accept value of length & width and Calculate Area of Rectangle.

package com.onurdesk.basic.interview.programs;

import java.util.Scanner;

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

		System.out.println("Enter the length of Rectangle:");
		double length = scanner.nextDouble();

		System.out.println("Enter the width of Rectangle:");
		double width = scanner.nextDouble();

		// Area = length*width;
		double area = length * width;

		System.out.println("Area of Rectangle is:" + area);
		System.out.println("Thank you for reading basic interview programs in java");
	}
}
basic interview programs in java 
area of rectangle

Program to Accept value of the side of Square and Calculate Area of Square.

package com.onurdesk.basic.interview.programs;

import java.util.*;

class AreaOfSquare {
	public static void main(String args[]) {
		int side, area;

		Scanner sc = new Scanner(System.in);

		System.out.println("Enter value of the sides of square");
		side = sc.nextInt();

		area = side * side;

		System.out.println("Area of Square : " + area);
		System.out.println("Thank you for reading basic interview programs in java");
	}
}
basic interview programs in java

Write a Program to Calculate Areas in Java.

package com.onurdesk.basic.interview.programs;

import java.util.Scanner;

class AreaCalculator {

	float l, b, h, r, ba, s, c;
	float result = 0f;
	float pi = 3.14f;
	int var;

	public static void main(String[] args) {
		AreaCalculator ar = new AreaCalculator();
		ar.options();

		System.out.println("Thank you for reading basic interview programs in java");

	}

	public void options() {
		Scanner a = new Scanner(System.in);
		System.out.println(
				"Enter the Object of which Area is to be calculated \n1:square \n2:rectangle \n3:Triangle\n4:circle\n5:Trapezoid\n6:Repeat\n7:Exit");

		var = a.nextInt();
		Area a1 = new Area();

		if (var == 1) {
			System.out.println("Enter the Side of Square");
			s = a.nextFloat();
			a1.square(s);
			options();
		}

		else if (var == 2) {
			System.out.println("Enter the Length of Rectangle");
			l = a.nextFloat();
			System.out.println("Enter the Breadth of Rectangle");
			b = a.nextFloat();
			a1.rectangle(l, b);
			options();
		}

		else if (var == 3) {
			System.out.println("Enter the Height of Triangle");
			h = a.nextFloat();
			System.out.println("Enter the Base of Triangle");
			ba = a.nextFloat();
			a1.triangle(h, ba);
			options();
		}

		else if (var == 4) {
			System.out.println("Enter the Radius of Circle");
			r = a.nextFloat();
			a1.circle(r);
			options();
		}

		else if (var == 5) {
			System.out.println("Enter the A side of Trapezoid");
			b = a.nextFloat();
			System.out.println("Enter the B side of Trapezoid");
			c = a.nextFloat();
			System.out.println("Enter the Height of Trapezoid");
			h = a.nextFloat();
			a1.trapezoid(b, c, h);
			options();
		}
	}
}

class Area {
	public void square(float s) {
		float result = 0f;
		result = s * s;
		System.out.println("The Area of Square is :" + result);
	}

	public void rectangle(float l, float b) {
		float result = 0f;
		result = l * b;
		System.out.println("The Area of Rectangle is :" + result);
	}

	public void triangle(float h, float ba) {
		float result = 0f;
		result = 0.5f * h * ba;
		System.out.println("The Area of Triangle is :" + result);
	}

	public void circle(float r) {
		float result = 0f;
		result = 3.14f * (r * r);
		System.out.println("The Area of Circle is :" + result);
	}

	public void trapezoid(float b, float c, float h) {
		float result = 0f;
		result = (((b + c) / 2) * h);
		System.out.println("The Area of Trapezoid is :" + result);
	}
}
Write a Program to Calculate Areas in Java.

Write a program Java to check if the number input by the users is prime or not

package com.onurdesk.basic.interview.programs;

import java.util.Scanner;

class PrimeCheck {
	public static void main(String args[]) {
		int temp;
		boolean isPrime = true;
		Scanner scan = new Scanner(System.in);
		System.out.println("Enter any number:");
		// number input by the users
		int num = scan.nextInt();
		scan.close();
		for (int i = 2; i <= num / 2; i++) {
			temp = num % i;
			if (temp == 0) {
				isPrime = false;
				break;
			}
		}
		// If isPrime is true then the number is prime else not
		if (isPrime)
			System.out.println("This "+num + " is a Prime Number");
		else
			System.out.println("This "+num + " is not a Prime Number");
		
		System.out.println("Thanks for visiting https://onurdesk.com");
		System.out.println("Like us on facebook ");
	}
}

Write a program to Find Simple Interest and Compound Interest in Java

package com.onurdesk.basic.interview.programs;

import java.lang.*;
import java.util.Scanner;

class CalculateInterest
{
    public static void main(String[] args)
    {
        double p, n, r, si, ci;

        Scanner s = new Scanner(System.in);

        System.out.print("Enter the amount : ");
        p = s.nextDouble();

        System.out.print("Enter the No.of years : ");
        n = s.nextDouble();

        System.out.print("Enter the Rate of interest : ");
        r = s.nextDouble();

        si = (p * n * r) / 100;
        ci = p * Math.pow(1.0 + r / 100.0, n) - p;

        System.out.println("\nAmount : " + p);
        System.out.println("No. of years : " + n);
        System.out.println("Rate of interest : " + r);
        System.out.println("Simple Interest : " + si);
        System.out.println("Compound Interest : " + ci);
        
        System.out.println("Thank you for reading basic interview programs in java");

    }
}

Write a program to Calculate Binary Number Calculation in Java

package com.onurdesk.basic.interview.programs;

import java.util.*;

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

		System.out.print("First Binary:  ");
		String binOne = in.next();

		System.out.print("Second Binary: ");
		String binTwo = in.next();

		int left = Integer.parseInt(binOne, 2);
		int right = Integer.parseInt(binTwo, 2);

		System.out.println("Sum of the binary numbers : " + Integer.toBinaryString(left + right));
		System.out.println("Difference of the binary numbers : " + Integer.toBinaryString(left - right));
		System.out.println("Product of the binary numbers : " + Integer.toBinaryString(left * right));
		System.out.println("Quotient of the binary numbers : " + Integer.toBinaryString(left / right));
		
		System.out.println("Thank you for reading basic interview programs in java");

		
	}
}

Write a program to convert Celsius to Fahrenheit in java.

package com.onurdesk.basic.interview.programs;

import java.util.*;

class CelsiustoFahrenheit {
	public static void main(String[] args) {
		double temperature;
		Scanner in = new Scanner(System.in);

		System.out.println("Enter temperature in Celsius");
		temperature = in.nextInt();

		temperature = (temperature * 9 / 5.0) + 32;
		System.out.println("Temperature in Fahrenheit = " + temperature);
		
		System.out.println("Thank you for reading basic interview programs in java");
	}
}

Write a program to Create a Simple Calculator in Java.

package com.onurdesk.basic.interview.programs;

import java.util.Scanner;
import java.io.*;

class Calculator {
	public static void main(String[] args) {
		int choice;
		int x = 0;
		int y = 0;
		int sum;
		PrintStream out;
		Scanner input;
		Calculator calc = new Calculator();
		try {
			out = new PrintStream("calclog.txt");
			do {
				System.out.println("Calculator Program");
				System.out.println("--------------------\n");
				System.out.println("1. Add");
				System.out.println("2. Subtract");
				System.out.println("3. Multiply");
				System.out.println("4. Divide");
				System.out.println("5. Mod");
				System.out.println("6. Power");
				System.out.println("99. End Program\n");
				System.out.println("Enter Choice: ");
				input = new Scanner(System.in);
				choice = input.nextInt();
				while ((choice < 1 || choice > 6) && choice != 99) {
					System.out.println("Please enter 1, 2, 3, 4, 5, or 6: ");
					choice = input.nextInt();
				}
				if (choice != 99) {
					System.out.println("Please enter 2 numbers only: ");
					x = input.nextInt();
					y = input.nextInt();
				}
				switch (choice) {
				case 1:
					sum = calc.add(x, y);
					System.out.printf("The sum is %d\n\n", sum);
					out.println(x + "+" + y + "=" + sum);
					break;
				case 2:
					sum = calc.sub(x, y);
					System.out.printf("The answer is %d\n\n", sum);
					out.println(x + "-" + y + "=" + sum);
					break;
				case 3:
					sum = calc.multi(x, y);
					System.out.printf("The answer is %d\n\n", sum);
					out.println(x + "*" + y + "=" + sum);
					break;
				case 4:
					try {
						sum = calc.div(x, y);
						System.out.printf("The answer is %d\n\n", sum);
						out.println(x + "/" + y + "=" + sum);
					} catch (Exception e) {
						System.out.println("\nError: Cannot Divide by zero\n\n");
					}
					break;
				case 5:
					sum = calc.mod(x, y);
					System.out.printf("The mod is %d\n\n", sum);
					out.println(x + "%" + y + "=" + sum);
					break;
				case 6:
					sum = calc.pow(x, y);
					System.out.printf("The answer is %d\n\n", sum);
					out.println(x + "^" + y + "=" + sum);
					break;
				}
			} while (choice != 99);
			input.close();
			System.out.println("Ending program...");
		} catch (Exception e) {
			System.out.println("ERROR: Some error occured");
			e.printStackTrace();
		}
	}

	public int add(int num1, int num2) {
		int sum;
		sum = num1 + num2;
		return sum;
	}

	public int sub(int num1, int num2) {
		int sum;
		sum = num1 - num2;
		return sum;
	}

	public int multi(int num1, int num2) {
		int sum;
		sum = num1 * num2;
		return sum;
	}

	public int div(int num1, int num2) {
		int sum;
		sum = num1 / num2;
		return sum;
	}

	public int mod(int num1, int num2) {
		int sum;
		sum = num1 % num2;
		return sum;
	}

	public int pow(int base, int exp) {
		int sum = 1;
		if (exp == 0) {
			sum = 1;
		}
		while (exp > 0) {
			sum = sum * base;
			exp--;
		}
		return sum;
	}
}

Write a program to Calculate Mean in java

package com.onurdesk.basic.interview.programs;

import java.util.Scanner;

class CalculateMean {

	public static void main(String[] args) {

		int sum = 0, inputNum;
		int counter;
		float mean;
		Scanner NumScanner = new Scanner(System.in);

		System.out.println("Enter the total number of terms whose mean you want to calculate");

		counter = NumScanner.nextInt();

		System.out.println("Please enter " + counter + " numbers:");

		for (int x = 1; x <= counter; x++) {
			inputNum = NumScanner.nextInt();
			sum = sum + inputNum;
			System.out.println();
		}

		mean = sum / counter;
		System.out.println("The mean of the " + counter + " numbers you entered is " + mean);
		System.out.println("Thank you for reading basic interview programs in java");
	}
}

Admin
Onurdesk is a technical platform based primarily on Spring, Java, and Nodejs ecosystem app creation. We write tutorials and manuals concentrating extensively on realistic and real-life usage cases.

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