Java Tutorial For Beginners: Part 7.

Java Program To Find Area And Perimeter Of A Rectangle

import java.util.*;

public class AreaAndPerimeterOfRectangle {

private static Scanner s;

public static void main(String[] args) {

double length, width, Area, Perimeter;

s = new Scanner(System.in);

System.out.print("Enter The Length Of A Rectangle =  ");

length = s.nextDouble();

System.out.print("Enter The Width Of A Rectangle = ");

width = s.nextDouble();

Area = length * width;

Perimeter = 2 * (length + width);

System.out.format("Area Of The Rectangle = %.2f\n",Area);

System.out.format("Perimeter Of The Rectangle = %.2f\n", Perimeter);

}}

Java Program To Find Area And Perimeter Of A Rectangle Using OOP

import java.util.Scanner;

public class AreaAndPerimeterOfRectangle3a {

private static Scanner s;

public static void main(String[] args) {

double length, width; 

s = new Scanner(System.in);

System.out.print("Enter The Length Of Rectangle =  ");

length = s.nextDouble();

System.out.print("Enter The Width Of Rectangle = ");

width = s.nextDouble();

AreaAndPerimeterOfRectangle3b ar = new AreaAndPerimeterOfRectangle3b();

ar.AreaofRectangle(length, width);

}}

^{AreaAndPerimeterOfRectangle3b.java:}

public class AreaAndPerimeterOfRectangle3b {

double Area, Perimeter;

public void AreaofRectangle( double length, double width ) {

Area = length * width;

Perimeter = 2 * (length + width);

System.out.format("The Area Of Rectangle = %.2f\n", Area);

System.out.format("The Perimeter Of Rectangle = %.2f\n", Perimeter);

}}

Java Program To Find The Sum And Average Of Some Given Numbers 

public class SumAndAverage {

public static void main(String args[]) {

int[] array = {10, 20, 30, 40, 50, 10};

int sum = 0;

for( int num : array) {

sum = sum+num;

}

double average = sum/array.length;

System.out.println("Sum of array elements is: "+sum);

System.out.println("Sum of array elements is: "+average);

}}

Java Program To Find The Sum And Average Of Numbers By User Input

import java.util.*;

public class SumAndAverage2 {

public static void main(String args[]) {

int count, i;

double sum=0;

double[] inputArray = new double[500];

Scanner n = new Scanner(System.in);

System.out.print("Total Elements: ");

count = n.nextInt();

System.out.println("Enter " + count + " Elements");

for(i = 0; i < count; i++) {

inputArray[i] = n.nextDouble();  

sum = sum + inputArray[i];

}

System.out.println("Sum : " + sum);

System.out.println("Average : " + (double)sum/count);

n.close();

}}