Program to find Area of a Triangle in Java

The program to find the area of a triangle is a simple program that demonstrates the program structure of Java. It is intended for beginner level learner of Java programming.


Also, we used NetBean 8.2 on a windows 7 64-bit with Java SDK 8u111 to write this program.

To help you understand the program read following sections – problem definition, flowchart, program code for practice and verified output.


Problem Definition

A triangle is a geometric shape with 3 sides and sum of internal angles make 180 degrees.The following figure shows a triangle with three sides.

Figure 1 - Triangle with Base and Height
Figure 1 – Triangle with Base and Height

To find the area of a triangle you need to know the length of base and the length of height and use the following formula.

Area of Triangle = base * (height /2) 
Area of Triangle = b * (h/2)


Flowchart: Java Program to find Area of a Triangle
Flowchart: Java Program to find Area of a Triangle

Program Code

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package JavaExamples;
 * @author Admin
public class AreaTriangle {

public static void main(String args[])

    int b, h;
    float area;

    try {

        DataInputStream d = new DataInputStream((;

        System.out.println("Enter value for Base:");

        String st = d.readLine();

        System.out.println("Enter value for Height:");

        String sh = d.readLine();

        b = Integer.parseInt(st);

        h = Integer.parseInt(sh);

        System.out.println("b=" + b);

        System.out.println("h=" + h);

        area = (b * h) / 2;

        System.out.println("Area of triangle=" + area);

        } catch (IOException e)   {

            System.out.println("Wrong Input");




Output – Area Of Triangle

Enter value for Base:


Enter value for Height:




Area of triangle= 120.0


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