Update randomizer.java

Author: BobSaidHi

randomizer.java

@@ -1 +1,91 @@
+import java.util.*;
 
+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();
+    }
+
+    /**
+     * Return a random color.
+     * @return A random hex string that represents a color.
+     */
+    public static String nextColor(){
+        String randomNum = Integer.toHexString(Randomizer.nextInt(0, 16777216));
+        return "'#" + randomNum + "'";
+    }
+}