Building Java Programs
Lab: Random Numbers
Except where otherwise noted, the contents of this document are
Copyright 2019 Stuart Reges and Marty Stepp.
Lab goals
Goals for this problem set:
- use
Random objects to produce random numbers
Random methods
To use these methods, you need a variable of type Random in
scope:
Random randy = new Random();
int aRandomNumber = randy.nextInt(10);
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Method name
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Returns...
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nextInt()
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a random integer
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nextInt(max)
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a random integer between 0 (inclusive) and max (exclusive)
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nextDouble()
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a random real number between 0.0 and 1.0
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nextBoolean()
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a random boolean value: true
or false
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Exercise : Random expressions
Fill in the boxes to produce expressions that will generate random numbers in the provided ranges.
Assume that the following Random variable has been declared:
Random rand = new Random();
Exercise : makeGuesses
Write a method named makeGuesses that will output random
numbers between 1 and 50 inclusive until it outputs one of at least 48.
Output each guess and the total number of guesses made. Below is a sample
execution:
guess = 43
guess = 47
guess = 45
guess = 27
guess = 49
total guesses = 5
