MATH-1041

Added "toString" method. Thanks to Sean Owen.


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1532679 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/math3/util/Pair.java

@@ -133,4 +133,9 @@ public class Pair<K, V> {
 
         return result;
     }
+
+    @Override
+    public String toString() {
+        return "[" + getKey() + ", " + getValue() + "]";
+    }
 }

src/test/java/org/apache/commons/math3/util/PairTest.java

@@ -73,6 +73,12 @@ public class PairTest {
         Assert.assertFalse(p1.hashCode() == p2.hashCode());
     }
 
+    @Test
+    public void testToString() {
+        Assert.assertEquals("[null, null]", new Pair<Object, Object>(null, null).toString());
+        Assert.assertEquals("[foo, 3]", new Pair<String, Integer>("foo", 3).toString());
+    }
+
     /**
      * A mutable integer.
      */