RandomGenerator classes should be Serializable

since they are used as fields of both Serializable RandomAdaptor
and RandomDataImpl classes

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@611495 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/math/random/RandomGenerator.java

@@ -16,6 +16,8 @@
  */
 package org.apache.commons.math.random;
 
+import java.io.Serializable;
+
 /**
  * Interface extracted from <code>java.util.Random</code>.  This interface is
  * implemented by {@link AbstractRandomGenerator}.  
@@ -23,7 +25,7 @@ package org.apache.commons.math.random;
  * @since 1.1
  * @version $Revision:$ $Date$
  */
-public interface RandomGenerator {
+public interface RandomGenerator extends Serializable {
     
     /**
      * Sets the seed of the underyling random number generator using a 

src/test/org/apache/commons/math/random/RandomAdaptorTest.java

@@ -67,6 +67,8 @@ public class RandomAdaptorTest extends RandomDataTest {
      */
     private static class ConstantGenerator implements RandomGenerator {
         
+        private static final long serialVersionUID = 5936262220824971138L;
+
         public boolean nextBoolean() {
             return false;
         }

src/test/org/apache/commons/math/random/TestRandomGenerator.java

@@ -25,6 +25,8 @@ import java.util.Random;
  * @version $Revision:$ $Date$
  */
 public class TestRandomGenerator extends AbstractRandomGenerator {
+
+    private static final long serialVersionUID = -9161426374178114548L;
     private Random random = new Random();
     
     public void setSeed(long seed) {