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Randomizer.java
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83 lines (69 loc) · 2.1 KB
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import java.util.Random;
public class Randomizer{
public static Random theInstance = null;
public Randomizer(){
}
public static Random getInstance(){
if(theInstance == null){
theInstance = new Random();
}
return theInstance;
}
/**
* Return a random boolean value.
* @return True or false value simulating a coin flip.
*/
public static boolean nextBoolean(){
return Randomizer.getInstance().nextBoolean();
}
/**
* This method simulates a weighted coin flip which will return
* true with the probability passed as a parameter.
*
* @param probability The probability that the method returns true, a value between 0 to 1 inclusive.
* @return True or false value simulating a weighted coin flip.
*/
public static boolean nextBoolean(double probability){
return Randomizer.nextDouble() < probability;
}
/**
* This method returns a random integer.
* @return A random integer.
*/
public static int nextInt(){
return Randomizer.getInstance().nextInt();
}
/**
* This method returns a random integer between 0 and n, exclusive.
* @param n The maximum value for the range.
* @return A random integer between 0 and n, exclusive.
*/
public static int nextInt(int n){
return Randomizer.getInstance().nextInt(n);
}
/**
* Return a number between min and max, inclusive.
* @param min The minimum integer value of the range, inclusive.
* @param max The maximum integer value in the range, inclusive.
* @return A random integer between min and max.
*/
public static int nextInt(int min, int max){
return min + Randomizer.nextInt(max - min + 1);
}
/**
* Return a random double between 0 and 1.
* @return A random double between 0 and 1.
*/
public static double nextDouble(){
return Randomizer.getInstance().nextDouble();
}
/**
* Return a random double between min and max.
* @param min The minimum double value in the range.
* @param max The maximum double value in the rang.
* @return A random double between min and max.
*/
public static double nextDouble(double min, double max){
return min + (max - min) * Randomizer.nextDouble();
}
}