set methods final to avoid uncertain subclassing

1 files changed, 3 insertions, 3 deletions

diff --git a/src/com.example.portfolio3/com/example/portfolio3/AbstractGraph.java b/src/com.example.portfolio3/com/example/portfolio3/AbstractGraph.java
index dbd4aa8..054fa65 100644
--- a/src/com.example.portfolio3/com/example/portfolio3/AbstractGraph.java
+++ b/src/com.example.portfolio3/com/example/portfolio3/AbstractGraph.java
@@ -21,7 +21,7 @@ public abstract class AbstractGraph implements Graph {
 	/// foo
 	/// @param s  foo
 	/// @return   Vertex
-	public Vertex vertex(final String s) {
+	public final Vertex vertex(final String s) {
 		if (vertexMap.containsKey(s)) {
 			return vertexMap.get(s);
 		}
@@ -33,12 +33,12 @@ public abstract class AbstractGraph implements Graph {
 	}
 
 	/// foo
-	public void insertEdge(final String v, final String u, final int w) {
+	public final void insertEdge(final String v, final String u, final int w) {
 		insertEdge(vertex(v), vertex(u), w);
 	}
 
 	/// foo
-	public Collection<Vertex> vertices() {
+	public final Collection<Vertex> vertices() {
 		return vertexSet;
 	}