General code refactoring and maintenance

1 files changed, 6 insertions, 1 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/gen/WeightedRandom.java b/BJC-Utils2/src/main/java/bjc/utils/gen/WeightedRandom.java
index 5a8ef8f..5157ee2 100644
--- a/BJC-Utils2/src/main/java/bjc/utils/gen/WeightedRandom.java
+++ b/BJC-Utils2/src/main/java/bjc/utils/gen/WeightedRandom.java
@@ -44,6 +44,11 @@ public class WeightedRandom<E> {
 		probabilities = new FunctionalList<>();
 		results = new FunctionalList<>();
 
+		if (src == null) {
+			throw new NullPointerException(
+					"Source of randomness must not be null");
+		}
+
 		source = src;
 	}
 
@@ -109,4 +114,4 @@ public class WeightedRandom<E> {
 	public FunctionalList<Pair<Integer, E>> getValues() {
 		return probabilities.pairWith(results);
 	}
-}
+}
\ No newline at end of file