--- android/TrainInfo/src/dk/thoerup/traininfo/util/IntSet.java	2009/10/11 07:18:56	440
+++ android/TrainInfo/src/dk/thoerup/traininfo/util/IntSet.java	2009/10/11 07:23:35	441
@@ -1,27 +1,17 @@
 package dk.thoerup.traininfo.util;
 
-import java.util.Set;
+
 import java.util.TreeSet;
 
-public class IntSet {
-	private Set<Integer> ints = new TreeSet<Integer>();
-	
-	public boolean hasInt(int i) {
-		return ints.contains(i);
-	}
-	
-	public void add(int i) {
-		ints.add(i);
-	}
-	
-	public void remove(int i) {
-		ints.remove(i);
-	}
+public class IntSet extends TreeSet<Integer> {
 	
+
+	private static final long serialVersionUID = 1L;
+
 	public String toString() {
 		StringBuffer sb = new StringBuffer();
 		
-		for (int i : ints) {
+		for (int i : this) {
 			if (sb.length() > 0) {
 				sb.append(",");
 			}
@@ -30,16 +20,12 @@
 		
 		return sb.toString();
 	}
-	
-	public int size() {
-		return ints.size();
-	}
-	
+		
 	public void fromString(String intStr) {
-		ints.clear();
+		this.clear();
 		String parts[] = intStr.split(",");
 		for (String istr : parts) {
-			ints.add( Integer.parseInt(istr));
+			this.add( Integer.parseInt(istr));
 		}
 	}