throw an exception when calling random() on empty XxxList (from 221006)

core/src/processing/data/DoubleList.java

@@ -681,6 +681,9 @@ public class DoubleList implements Iterable<Double> {
    * Return a random value from the list.
    */
   public double random() {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this DoubleList");
+    }
     return data[(int) (Math.random() * count)];
   }
 
@@ -690,6 +693,9 @@ public class DoubleList implements Iterable<Double> {
    * randomSeed() from the specified sketch object.
    */
   public double random(PApplet sketch) {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this DoubleList");
+    }
     return data[(int) sketch.random(count)];
   }
 

core/src/processing/data/FloatList.java

@@ -703,6 +703,9 @@ public class FloatList implements Iterable<Float> {
    * Return a random value from the list.
    */
   public float random() {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this FloatList");
+    }
     return data[(int) (Math.random() * count)];
   }
 
@@ -712,6 +715,9 @@ public class FloatList implements Iterable<Float> {
    * randomSeed() from the specified sketch object.
    */
   public float random(PApplet sketch) {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this FloatList");
+    }
     return data[(int) sketch.random(count)];
   }
 

core/src/processing/data/IntList.java

@@ -678,6 +678,9 @@ public class IntList implements Iterable<Integer> {
    * Return a random value from the list.
    */
   public int random() {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this IntList");
+    }
     return data[(int) (Math.random() * count)];
   }
 
@@ -687,6 +690,9 @@ public class IntList implements Iterable<Integer> {
    * randomSeed() from the specified sketch object.
    */
   public int random(PApplet sketch) {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this IntList");
+    }
     return data[(int) sketch.random(count)];
   }
 

core/src/processing/data/StringList.java

@@ -581,6 +581,9 @@ public class StringList implements Iterable<String> {
    * Return a random value from the list.
    */
   public String random() {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this StringList");
+    }
     return data[(int) (Math.random() * count)];
   }
 
@@ -590,6 +593,9 @@ public class StringList implements Iterable<String> {
    * randomSeed() from the specified sketch object.
    */
   public String random(PApplet sketch) {
+    if (count == 0) {
+      throw new ArrayIndexOutOfBoundsException("No entries in this StringList");
+    }
     return data[(int) sketch.random(count)];
   }