Program to find Area of a Triangle in Java

The program to find area of a triangle is a simple program that demonstrate 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");





The output of the above program is given below.


Enter value for Base:


Enter value for Height:




Area of triangle= 120.0