1 files changed, 12 insertions, 2 deletions
diff --git a/src/net/sourceforge/plantuml/sequencediagram/teoz/StairsPosition.java b/src/net/sourceforge/plantuml/sequencediagram/teoz/StairsPosition.java
index 5763529..c681ed2 100644
--- a/src/net/sourceforge/plantuml/sequencediagram/teoz/StairsPosition.java
+++ b/src/net/sourceforge/plantuml/sequencediagram/teoz/StairsPosition.java
@@ -2,7 +2,7 @@
  * PlantUML : a free UML diagram generator
  * ========================================================================
  *
- * (C) Copyright 2009-2017, Arnaud Roques
+ * (C) Copyright 2009-2020, Arnaud Roques
  *
  * Project Info:  http://plantuml.com
  * 
@@ -35,7 +35,6 @@
  */
 package net.sourceforge.plantuml.sequencediagram.teoz;
 
-
 public class StairsPosition implements Comparable<StairsPosition> {
 
 	private final double value;
@@ -51,6 +50,17 @@ public class StairsPosition implements Comparable<StairsPosition> {
 		return "" + value + "-(" + destroy + ")";
 	}
 
+	@Override
+	public int hashCode() {
+		return new Double(value).hashCode() + (destroy ? 17 : 37);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		final StairsPosition other = (StairsPosition) obj;
+		return this.value == other.value && this.destroy == other.destroy;
+	}
+
 	public double getValue() {
 		return value;
 	}