Sams Teach Yourself Java™ in 24 Hours, Sixth Edition

Testing Your Computer Speed

This hour’s workshop is a Java program that performs a benchmark, a test that measures how fast computer hardware or software is operating. The Benchmark program uses a loop statement to repeatedly perform the following mathematical expression:

double x = Math.sqrt(index);

This statement calls the Math.sqrt() method to find the square root of a number. You learn how methods work during Hour 11, “Describing What Your Object Is Like.”

The benchmark you’re creating sees how many times a Java program can calculate a square root in one minute.

Use NetBeans to create a new empty Java file called Benchmark. Enter the text of Listing 8.2 and save the program when you’re done.

Listing 8.2. The Full Source Code of Benchmark.java ...