52 lines
1.3 KiB
Java
Executable File
52 lines
1.3 KiB
Java
Executable File
import java.util.Random;
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/**
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* Provide control over the randomization of the simulation. By using the shared, fixed-seed
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* randomizer, repeated runs will perform exactly the same (which helps with testing). Set
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* 'useShared' to false to get different random behaviour every time.
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*
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* @author David J. Barnes and Michael Kölling
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* @version 2016.02.29
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*/
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public class Randomizer
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{
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// The default seed for control of randomization.
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private static final int SEED = 1111;
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// A shared Random object, if required.
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private static final Random rand = new Random(SEED);
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// Determine whether a shared random generator is to be provided.
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private static final boolean useShared = true;
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/**
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* Constructor for objects of class Randomizer
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*/
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public Randomizer()
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{
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}
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/**
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* Provide a random generator.
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* @return A random object.
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*/
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public static Random getRandom()
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{
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if(useShared) {
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return rand;
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}
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else {
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return new Random();
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}
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}
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/**
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* Reset the randomization.
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* This will have no effect if randomization is not through a shared Random generator.
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*/
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public static void reset()
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{
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if(useShared) {
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rand.setSeed(SEED);
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}
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}
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}
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