Top Most Java program to calculate area of Triangle - Homework, programming exercise example

Calculate area of Triangle in Java

Write a Java program to calculate Area of Triangle, accept input from User and display output in Console is one of the frequently asked homework question. This is not a tough programming exercise but a good exercise for beginners and anyone who has started working in Java. For calculating area of triangle using formula 1/2(base*height), you need to use arithmetic operator. By doing this kind of exercise you will understand how arithmetic operators works in Java, subtle details which affect calculation like precedence and associativity of operator etc. Fortunately this question is not very popular on Java interview like other exercise we have seen e.g. Java program to print Fibonacci series and Java program to check for palindrome. Nevertheless its a good Java homework.

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Top Most How to read input from command line in Java using Scanner

Java 5 introduced a nice utility called java.util.Scanner which is capable to read input form command line in Java. Using Scanner is nice and clean way of retrieving user input from console or command line. Scanner can accept InputStream, Reader or simply path of file from where to read input. In order to reading from command line we can pass System.in into Scanner's constructor as source of input. Scanner offers several benefit over classical BufferedReader approach, here are some of benefits of using java.util.Scanner for reading input from command line in Java:

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Top Most Java Program to get input from User from Console or command line- Example Tutorial Code

How to get input from user in Java from command line or console is one of the common thing ,every one started learning Java looks for. It’s second most popular way of starting programming after HelloWorld in Java. There are so many ways to get input from User in Java including command line and Graphical user interface. For beginner simpler the example, better it is. first and foremost way of getting input from user is String[] passed to main method in Java but that only work for one time requirement and its not interactive. Another way of getting input from User is involving IO classes like InputStreamto read from console or command line which can be little complicated for true beginner. Thanks to Java 5 which added a nice utility class called Scanner, has made task of getting input from user very easy. Scanner is powerful and allows you to get any kind of input from User e.g. String, int, float etc.

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