Posts Tagged ‘triangle’

Printing Triangles in Java

Featured, Java 23.11.2015 1 Comment

A common problem many new Java developers is to write a program that prints out a triangle. There a lots of variations on this problem but lets start with a simple case and then have a look at some possible variations. Probably the simplest case is a left aligned triangle of stars that looks like…

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Using a List instead of an array

Java 8.3.2012 2 Comments

Lists and arrays can both be used to store ordered collections of data. Both have their strengths and weakness which we shall discuss in a later post. Previously we showed you how to generate Pascals Triangle and in that Java example we used arrays to represent each row of the triangle. The following code shows…

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Pascals Triangle

Java 13.2.2011 14 Comments

Write a Java application that prints the first 10 lines of Pascals Triangle. Each row of a Pascals Triangle can be calculated from the previous row so the core of the solution is a method that calculates a row based on the previous row which is passed as input. Once we have that it is…

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Pythagoras Theorem

Java 13.12.2010 No Comments

One of our member students was asked to implement the Pythagoras Theorem using Java. This is a good opportunity to introduce the Math class which contains a collection of static methods for various mathematical functions. We need the square root method (sort) to calculate the hypotenuse, and can also use the pow() method to calculate…

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