IntSet: add toString methods

prism/src/common/IntSet.java

@@ -106,6 +106,23 @@ public interface IntSet extends Iterable<Integer>
 				false);
 	}
 
+	/** Return this set as a String */
+	public default String asString()
+	{
+		// can't overload toString() with a default method in interface
+		StringBuffer sb = new StringBuffer();
+		sb.append("{");
+		boolean first = true;
+		for (OfInt it = iterator(); it.hasNext(); ) {
+			if (!first)
+				sb.append(",");
+			first = false;
+			sb.append(it.nextInt());
+		}
+		sb.append("}");
+		return sb.toString();
+	}
+
 	/**
 	 * Wrapper class for obtaining an IntSet from a BitSet.
 	 * <p>
@@ -158,6 +175,12 @@ public interface IntSet extends Iterable<Integer>
 		{
 			return bs.get(index);
 		}
+
+		@Override
+		public String toString()
+		{
+			return asString();
+		}
 	};
 
 	/** Convenience class for simulating a singleton set */
@@ -212,6 +235,13 @@ public interface IntSet extends Iterable<Integer>
 		{
 			return index == singleMember;
 		}
+
+		@Override
+		public String toString()
+		{
+			return "{" + singleMember + "}";
+		}
+
 	}
 
 	/**

prism/src/explicit/SCCInfo.java

@@ -195,6 +195,12 @@ public class SCCInfo implements SCCConsumer
 				int sccForState = getSCCIndex(stateIndex);
 				return sccForState == sccIndex;
 			}
+
+			@Override
+			public String toString()
+			{
+				return asString();
+			}
 		};
 	}