### Java Program to Calculate Area of Square, Rectangle and Triangle

In this tutorial, we will write below Java programs:
1. Java Program to Calculate Area of Square
2. Java Program to Calculate Area of Rectangle
3. Java program to calculate the area of Triangle

# 1. Java Program to Calculate Area of Square

```package com.javaguides.java.tutorial;

import java.util.Scanner;

/**
* Java Program to Calculate Area of Square
*
* @author https://www.javaguides.net/
*
*/
public class JavaProgram {
public static void main(String[] args) {

try (Scanner scanner = new Scanner(System.in)) {
System.out.println("Enter Side of Square:");
// Storing the captured value in a variable
double side = scanner.nextDouble();
// Area of Square = side*side
double area = side * side;
System.out.println("Area of Square is: " + area);
}
}
}```
Output:
``````Enter Side of Square:
10
Area of Square is: 100.0``````

# 2. Java Program to Calculate Area of Rectangle

```package com.javaguides.java.tutorial;

import java.util.Scanner;

/**
* Java Program to Calculate Area of Rectangle
*
* @author https://www.javaguides.net/ *
*/
public class JavaProgram {
public static void main(String[] args) {

try (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);
}
}
}```
Output:
``````Enter the length of Rectangle:
10
Enter the width of Rectangle:
20
Area of Rectangle is:200.0``````

# 3. Java program to calculate the area of Triangle

```package com.javaguides.java.tutorial;

import java.util.Scanner;

/**
* Java program to calculate area of Triangle
*
* @author https://www.javaguides.net/ *
*/
public class JavaProgram {
public static void main(String[] args) {

try (Scanner scanner = new Scanner(System.in)) {
System.out.println("Enter the width of the Triangle:");
double base = scanner.nextDouble();

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

// Area = (width*height)/2
double area = (base * height) / 2;
System.out.println("Area of Triangle is: " + area);
}
}
}```
Output:
``````Enter the width of the Triangle:
10
Enter the height of the Triangle:
5
Area of Triangle is: 25.0``````